Hyo Seon Park's research while affiliated with Yonsei University and other places
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Publications (194)
In this study, a structural response estimation method for evaluating the long-term strain, which can serve as the basis of assessing structural safety of concrete structures, is presented. Characteristics of short-term deformation caused by environmental influences and long-term inelastic deformation caused by combination of rheological effects an...
Prestressed concrete (PC) slab using tendons is one of the most frequently used slab systems in the construction of buildings with long-span slabs. To simultaneously minimize the construction cost and the environmental impact, a green design model for PC slabs in long-span structures is necessary. In this paper, a multi-objective green design model...
Various system identification (SI) techniques have been developed to ensure the sufficient structural performance of buildings. Recently, attempts have been made to solve the problem of the excessive computational time required for operational modal analysis (OMA), which is involved in SI, by using the deep learning (DL) algorithm and to overcome t...
In this study, a plate‐type locally resonant metamaterial (PTLRM) is proposed to control bending vibrations and low‐frequency noise of civil members. Considering the ease of design, installation, and workability, the PTLRM was fabricated using high‐density and soft materials. The PTLRM design includes a resonance frequency calculation of the unit a...
In this paper, a new locally resonant metamaterial (LRM) is proposed to attenuate noise and vibration of floors in residential buildings. The band gap behavior of LRMs has recently attracted attention in the field of noise and vibration absorption. However, no research has been reported in the literature on the practical application of LRMs in buil...
Repetitive and severe thermal loads and load changes affect not only the physical properties of the coke drum but also its dynamic properties, possibly leading to structural failure. In particular, the operation weight of the drum, which increases up to 10 times or more, affects the dynamic properties of the structure and may threaten safety. There...
Structural response recovery and prediction technologies are required for long-term structural health monitoring (SHM). In this study, a structural response prediction method was proposed to evaluate the long-term safety of structures in which SHM system failure occurred by constructing a safety network of buildings in a given region. In this metho...
This study proposes a long-term strain prediction model for concrete structures using weather data. In the proposed model, the relationship between weather and the strain data for a concrete structure is defined by a convolutional neural network (CNN), which is a machine learning technique, based on the strong correlation between the two types of d...
Construction noise from several urban construction sites damages both construction companies and residents by creating an unpleasant acoustic environment. Noise barriers can be a great option to manage construction noise at a level that satisfies both construction companies and residents when installed considering construction project conditions. T...
Existing construction noise regulations have limitations in solving the problems of declining the profitability of construction companies and the quality of life of affected occupants due to construction noise. This study developed a construction noise rating system that can evaluate the impact of construction noise over a large area. To develop th...
A data prediction method for long-term strain measurements from concrete structures based on the strong correlation between air temperature and structural response is proposed. A convolutional neural network (CNN) is employed to capture and define the relationship between the structural response and air temperature. The CNN is trained using measure...
Noise in construction projects, one of the major problems at urban construction sites, should be evaluated and managed according to the construction noise regulation. This study developed a prediction model for proportion of buildings exposed to noise in excess of the construction noise regulation (the overexposed building ratio) as the evaluation...
As the emission of CO2 is directly proportional to the nature of the materials used in the construction of buildings, an eco-friendly economic design is required for waffle slabs used in large buildings such as stores, shopping malls. In this study, a multi-objective optimization design model, denoted as an eco-friendly and economically optimal des...
The enhanced frequency domain decomposition (EFDD) method can yield different results with respect to modal parameters depending on the measurement and analysis conditions of the target building. Consequently, field measurement guidelines for EFDD are required. In this paper, a practical field measurement technique is proposed for the identificatio...
Flat plate floor systems are most often constructed in residential or mixed-use buildings for a variety of reasons such as shortening the construction time, reducing the floor height and achieving spatial flexibility. Additionally, flat plate floor systems have the largest volume among the structural members, so these systems have the largest influ...
In this study, the aerodynamic characteristics of tall buildings with corner modifications (e.g., local wind force coefficients, mean pressure distributions, normalized power spectrum density, and extreme local pressure) were examined. Wind tunnel experiments were conducted to measure the wind pressures on building models with different heights and...
As a time domain system identification method, the extended Kalman filter (EKF) has been continuously used for structural damage identification. The performance of the EKF varies greatly depending on the selection of the initial parameters’ values and their combinations. In this paper, to improve the convergence performance of the EKF and to overco...
Although various technologies are being developed in the construction industry, management technologies for achieving environmental sustainability in the local community are still lacking. As such, this study suggests future insights for the development of an automated intelligent environment management system for the promotion of environmental sus...
The management of noise, vibration, and dust, which are hazardous pollutants from construction sites, is essential to minimize the health damage of the nearby residents and the economic damage of construction companies due to pollutants from construction sites. For the effective management of hazardous pollutants, their emissions from construction...
This study presents a damage localization method for building structures using dynamic displacement responses based on a convolutional neural network (CNN). The proposed method is based on the interrelation of dynamic displacement response measured from a building in a healthy state. Based on the interrelation constructed by CNN in advance, damaged...
The strain sensors that are used to evaluate structural members have a limited lifespan and thus have shown limitations to perform long-term structural health monitoring (SHM). This study presents a convolutional neural network (CNN)-based strain prediction technique that allows for structural safety evaluations in case of absence or defect of stra...
The outdoor view through windows is an indoor environmental factor that significantly affects mental health. Accordingly, the purpose of this study was to develop an integrated psychological score of occupants based on their perception and emotional response according to the outdoor view size. This study used virtual reality technology to realize d...
Seismic retrofit of reinforced concrete (RC) columns using wing walls can be used to improve the shear and flexural strength of the column through a relatively simple process. However, the feasibility and efficiency of the seismic retrofitting of RC frames with wing walls heavily depends on the selection of number of columns to be retrofitted, the...
As construction noise has become one of the most harmful pollutants for nearby residents, it is essential to quantify the health impacts of noise exposure to reduce them and reduce the number of resident disputes. Accordingly, this study aims to propose a method to assess the quantitative health impact of construction noise exposure on nearby resid...
This study presents the optimal location and properties (e.g., mass and stiffness) of structural links for LB systems. The objective is to minimize wind-induced displacement responses as well as wind-induced acceleration responses of LB systems. A series of wind tunnel tests were conducted in which wind loads were measured for varying distances bet...
In this study, a method of predicting the seismic responses of building structures based on a convolutional neural network (CNN) is proposed. In the method, the time histories of acceleration responses previously measured in a building during earthquakes are used in the CNN input layer, with the corresponding time histories of the displacement resp...
In this study, a structural response recovery method using a convolutional neural network is proposed. The aim of this study is to restore missing strain structural responses when they cannot be collected due to a sensor fault, data loss, or communication errors. To this end, a convolutional neural network model for data recovery is constructed usi...
The reduction of low frequency structure-borne sound transmission through floors is a highly demanding work in building construction engineering. The floating floor system with low natural frequency (FFLN) is considered as a practical method to reduce the low frequency transmission without changing structural design. An important aspect of the FFLN...
Environmental pollutants emitted by various construction work and heavy equipment from construction sites, not only undermine the human living environment but also cause conflicts with residents near the construction sites. Therefore, this study aimed to determine the real-time monitoring indices of environmental pollutants in building construction...
Composite beams comprising concrete slabs supported by steel beams typically constitute more than 70% of the total volume of the structure of an office building. Little, if any, research has been conducted regarding the design and construction of a floor system that successfully accounts for eco-friendliness. To remedy this, an optimal sustainable...
In this paper, a new model for predicting seismic responses of buildings based on the correlation of ground motion (GM) and the structure is presented by simulating numerous artificial earthquakes (AEQs). In the model, neural network (NN) configurations representing the relationships between GM characteristics and seismic responses of a structure a...
This study presents a convolutional neural network (CNN)‐based response estimation model for structural health monitoring (SHM) of tall buildings subject to wind loads. In this model, the wind‐induced responses are estimated by CNN trained with previously measured sensor signals; this enables the SHM system to operate stably even when a sensor faul...
The primary goal of this paper is to address the challenges associated with the design and application of a practical wireless measurement system for the continuous safety monitoring of a large-scale structural members under construction. A practical wireless sensor network system (WSNS) was designed and real-time structural health monitoring (SHM)...
In this study, a noncontact bending and torsional stiffness estimation model for automobile frames is proposed. The deformed shapes of an automobile frame during bending and torsional loading tests were determined based on the 3D displacements from motion capture system (MCS). The measurement results from the system and existing sensors, such as li...
This study investigated the aerodynamic characteristics of two tall buildings through an independent component analysis (ICA) and principal component analysis (PCA) of wind-induced pressure fields. The pressure patterns identified by ICA and PCA were compared using the wind pressures on two building models measured in a series of wind tunnel tests...
The mega columns used in super-tall buildings are several meters in size; thus, a greater quantity of construction materials are required than for a general column. Considering the environmental impact, research on a green design model for super-tall buildings is necessary. This design model should minimize both CO 2 emissions and cost in the mega-...
A shear wall is a vertical member with a relatively large volume that is used frequently as a vertical passage and a lateral load support system in every building without exception. Many studies have been conducted on the sustainable design of buildings, but few have studied the sustainable design of shear walls considering CO2 emissions. Herein, a...
This paper presents an optimum design model for the green construction of reinforced concrete two-way slabs in buildings. The model was applied to various design cases of two-way slabs in residential, office, and commercial buildings to derive designs that minimize environmental impact. The sustainability and economic feasibility of the derived des...
This study investigated the wind environment around buildings by visualizing the wind flow patterns of linked buildings (LB), in which two buildings with circular sections are attached through linking members. Particle image velocimetry was used to measure the wind flows around LB models with different gap distances between the buildings. Proper or...
The outrigger and belt truss system is the most commonly used lateral load‐resisting system for high‐rise buildings in which the external mega columns and core walls are connected via outriggers and belt trusses. The shear studs, which are used for the connections between the outriggers and the core walls, are subjected to pull‐out loading because...
High‐strength concrete columns have the advantage of increasing the amount of usable area in the building because the cross‐section of the columns takes up less space compared with columns using normal strength concrete. However, it is difficult to weld the steel reinforcement and steel members because of the narrow column width due to a decrease i...
This paper presents a model updating method for the damage detection of building structures on the basis of modal participation without the need for system identification to extract the modal parameters. The presented method uses the modal participation ratio (MPR), which is defined by a representative value of modal responses extracted from vibrat...
Based on performance-based seismic engineering, this paper proposes an optimal seismic retrofit model for steel moment resisting frames (SMRFs) to generate a retrofit scheme at minimal cost. To satisfy the acceptance criteria for the Basic Safety Objective (BSO) specified in FEMA 356, the minimum number of upgraded connections and their locations i...
Any additional loads applied to a damaged structure can aggravate its instability and thus, the impact of successive earthquakes need to be considered. This study proposed a quantitative assessment model for the fragility of a damaged structure subjected to aftershock. Mean period and the strong motion duration were considered as characteristics of...
This paper presents a new approach for the damage detection of building structures under ambient excitation based on the inherent modal characteristics. In this study, without the extraction of modal parameters widely utilized in the previous studies on damage detection, a new index called the modal participation ratio (MPR), which is a representat...
Previous laboratory-scale research has shown that the post-yield softening of graphite-incorporated expanded polystyrene (EPS) foam has the unique property of vibroacoustic insulation for low-frequency floor impacts. However, the core softening causes decoupled behaviors in the sandwich floor, and thus, the improvement in insulation may deteriorate...
Generally, the excavation work performed to lay the foundation and create the underground space of structures causes deformation of the surrounding ground. Such deformations could threaten the lives of residents and the safety of structures. Consequently, borehole inclinometers have been used to monitor these deformations. The typically used underg...
This paper presents a real-time structural health monitoring technique for a supertall building under construction, Lotte World Tower (LWT), the tallest building in Korea. To evaluate the state and safety of the supertall building under construction, this study presents a visual modal identification method to identify mode shape and damping ratio b...
To create a joint between reinforced concrete (RC) walls and steel girders in high-rise buildings, the concrete around the embedded plate cannot avoid the damage due to the heat input from a long-time welding (6–48 hours) of the embedded and gusset plates. A literature review showed insufficient research on evaluation of concrete damage due to the...
The modal parameters of civil structures (natural frequency, mode shape, and mode damping ratio) are used for structural health monitoring (SHM), damage detection, and updating the finite element model. Long-term measurement has been necessary to conduct operational modal analysis (OMA) under various loading conditions, requiring hundreds of thousa...
An integrated sustainable seismic analysis model is developed to investigate the relationships of CO2 emissions, the seismic performance, and material production costs of seismic design schemes of buildings. In this study, a green seismic analysis model is presented in the form of performance-based optimal seismic design with sustainability (PBODS)...
A key issue in health monitoring of smart structures is the estimation of modal parameters such as natural frequencies and damping ratios from acquired dynamic signals. In this article, a new methodology is presented for calculating the natural frequencies (NF) and damping ratios (DR) of large civil infrastructure from acquired dynamic signals usin...
In the field of structural health monitoring, terrestrial laser scanning (TLS) is commonly used as a measurement method for structural safety evaluation. However, the major disadvantages of using laser pulses is the possibility of data discontinuity and the likelihood of the existence a certain level of error because acquired points tend to not hav...
Since existing structures can be retrofitted without removing or damaging the existing structural members, a seismic retrofit with FRP bracings has high applicability and cost efficiency. This study proposes an FRP-bracing-based optimal seismic retrofit method for reinforced concrete (RC) frames with infill walls. This method minimizes the number o...
Strain sensor network-based structural health monitoring systems have been used to assess the safety of high-rise buildings. In consideration of life cycle of high-rise buildings, long-term measurement by sensors should be required. However, because of unpredictable problems such as the lack of durability of sensors and data loggers, disruption in...
This paper presents a stress estimation model for the safety evaluation of steel frame structures with rigid links using a vision-based monitoring system. In this model, the deformed shape of a structure under external loads is estimated via displacements measured by a motion capture system (MCS), which is a non-contact displacement measurement dev...
Conventional model updating methods for structures mainly use modal parameters, which are global structural responses such as natural frequency, mode shape, and modal damping obtained through vibration measurements. A model updated using those modal parameters can accurately estimate global structural responses and is used to evaluate the state of...
Construction materials are known to cause a considerable environmental impact during their manufacturing and construction phases. The environmental impact such as CO2 emissions can be calculated based on the amount of materials used. To reduce CO2 emissions, it is necessary to develop technologies that can reduce the amount of materials used in the...
Seismic design of braced frames that simultaneously considers economic issues and structural performance represents a rather complicated engineering problem, and therefore, a systematic and well-established methodology is needed. This study proposes a multi-objective seismic design method for an inverted V-braced frame with suspended zipper struts...
This paper presents the resizing method of columns and beams that considers column-to-beam strength ratios to simultaneously control the initial stiffness and ductility of steel moment frames. The proposed method minimizes the top-floor displacement of a structure while satisfying the constraint conditions with respect to the total structural weigh...
To reduce CO2 emissions from the manufacturing phase of building materials, sustainable structural design has been introduced. However, embodied CO2 emission data in construction materials vary significantly depending on life cycle assessment (LCA) techniques, nations, and the time of data formation. In the embodied CO2 emission data used in recent...
This study aims to develop the four-node-based finite element model for estimating the techno-economic performance of the building-integrated photovoltaic blind (FEM4-nodeBIPB), which can be used by decision-maker in the early design phase. In developing the proposed model, this study uses various research methodologies such as energy simulation, f...
This article proposes a new system identification (SI) method using the modal responses obtained from the dynamic responses of a structure for estimating modal parameters. Since the proposed SI method visually extracts the mode shape of a structure through the plotting of modal responses based on measured data points, the complex calculation proces...
Thanks to advances in technologies related to zero energy buildings, reducing CO2 emissions during the design and construction phase becomes more and more important to reduce environmental impact from building construction. Even though more than half of high-rise buildings over 200 m completed in 2014 employed steel reinforced concrete (SRC) compos...
In this paper, the optimal seismic design method for inducing the beam-hinge collapse mechanism of steel moment frames is presented. This uses the non-dominated sorting genetic algorithm II(NSGA-II) as an optimal algorithm. The constraint condition for preventing the occurrence of plastic hinges at columns is used to induce the beam-hinge collapse...
In this paper, a dynamic displacements-based model updating method using a motion capture system (MCS) is proposed. The dynamic characteristics from MCS are used to find the parameters that minimize the difference between updated model and direct measurement. Using a multi-objective optimization algorithm of non-dominated sorting genetic algorithm-...
Outrigger systems, which consist of a core wall, external columns, and outriggers, are widely used in structural systems in high-rise buildings to control lateral displacements. This study proposes an optimal design method for minimizing the volume of the primary structural members (core wall, outrigger, and external columns) and calculating the op...
As a new paradigm for safety assessment of beam structures, this paper proposes a sensor-free monitoring model to estimate the stress distribution of steel beam structures with uncertain loads. The model consists of three steps: 1) the use of a sensor- and wire-free measurement step using a motion capture system; 2) a deformed shape estimation step...
This paper proposes a nonlinear autoregressive moving average (NARMA) model for use in system identification (SI) of high performance smart buildings under ambient excitations. The NARMA model is implemented by including the cross terms of output signals to a linear autoregressive moving average (LARMA) time series model. To demonstrate the effecti...
Although a concrete-filled steel tube (CFT) column, which is one of the composite columns frequently used in building construction because of its structural performance, economic feasibility, and good space utilization, has a high potential to reduce CO2 emissions because of combining two heterogeneous materials, the relationship among CO2 emission...
To solve global warming issues, the whole world is moving toward establishing the post-2020 climate regime. As part of its efforts, each country is promoting the reduction of its greenhouse gas emissions by setting up its national carbon emissions reduction target (CERT). Therefore, this study proposed the optimal PV system implementation strategy...
The transmission of low-frequency floor impact noises in buildings remains a longstanding problem to be solved. To design insulation materials for attenuating the low-frequency floor impact noises, a distinctive property with a dynamic stiffness that is low enough to achieve natural frequencies that are also sufficiently low, without an excessively...
The structural safety of a beam structure is assessed by a comparison between the maximum stress measured during monitoring and the allowable stress of the beam. However, the strain directly measured from a fiber Bragg grat- ing (FBG) strain sensor may not be identical with the actual maximum strain induced in the structural member. Unless a FBG st...
Measured signals obtained by sensors during dynamic events such as earthquake, wind, and wave contain nonlinear, nonstationary, and noisy properties. In this paper, a new approach is presented for modal parameter identification of structures particularly suitable for very large real-life structures such as super high-rise building structures based...
Cold-formed steel is uniform in quality, suitable for mass production, and light in weight. It is widely used for both structural and nonstructural members in buildings. When it is used in a bending structural member, damage such as local buckling is considered to be more important than general steel members in terms of failure mode. However, prece...
Abstract This paper presents a new vision-based system identification (SI) technique for building structures by using a motion capture system (MCS). The MCS with outstanding capabilities for dynamic response measurements can provide gage-free measurements of vibrations through the convenient installation of multiple markers. In this technique, from...
The maximum stress of a structural member has been extensively adopted as a safety assessment indicator in structural health monitoring. Due to construction errors in the field and changes in the loading conditions during or after construction, it is impractical to accurately predict the location and magnitude of the maximum strain of a member a pr...
This article presents a distributed nondominated sorting genetic algorithm II (NSGA-II) for optimal seismic retrofit design using buckling restrained braces (BRBs) on a cluster of multi-core PCs. In the formulation, two conflicting objective functions of the initial BRB installation cost required for seismic retrofitting and damage cost that can be...
Conventional model updating methods for the structures have used global structural responses which are modal parameters obtained through vibration measurements. Although models updated by modal parameters estimate global structural responses accurately, they have difficulties to predict local responses for safety assesment of structural members. Th...
Evaluating the financial viability of a build-operate-transfer project for highway service areas (HSA BOT project) in South Korea is very important for the private sector because it does not have a risk-allocation agreement with the public sector, such as the minimum revenue guarantee. In this study, a model to evaluate the financial viability of a...
The vibroacoustic behavior of a commonly used floating floor installed in an actual multifamily housing unit was investigated to determine the factors that influence impact sound transmission at low frequencies. A finite element vibration model of the floor structure and an experimental sound field against a rubber ball impact were analyzed in comb...
The safety of a multi-span waler beam subjected simultaneously to a distributed load and deflections at its supports can be secured by limiting the maximum stress of the beam to a specific value to prevent the beam from reaching a limit state for failure or collapse. Despite the fact that the vast majority of accidents on construction sites occur a...
This article proposes a model updating technique based on modal participation factors for a beam structure. In this model updating technique, the error functions of the dynamic characteristic differences between measurement and model are generated as the number of modes under consideration and minimized using the multiobjective optimization techniq...
Conventional 1-D or 2-D displacement sensors are occasionally used to measure the deformation of a structure. However, a motion capture system (MCS) can measure the 3-D movements of markers attached to a target structure with high accuracy and a high sampling rate. Because markers can be easily attached to a structure, an MCS is useful for monitori...
Creep-induced changes in dynamic stiffness of resilient interlayer used for floating floor is an important parameter of vibration isolator in long-term use. Compressive creep behavior of a composite layer made from closed-cell foam and fibrous material is investigated using a Findley equation-based method recommended by International Organization f...
In the buildings, the systems of structures are influenced by the gravity load changes due to room alteration or construction stage. This paper proposes a system identification method establishing mass as well as stiffness to parameters in model updating process considering mass change in the buildings. In this proposed method, modified genetic alg...
Estimating the maximum stress through stress distribution of a structure is an important indicator for structural safety evaluation. Structural health monitoring can be used to do this with a variety of measuring equipment such as strain gage, LVDT, LDS. All the measuring equipment, however, has some weakness in the configuration of complex wire ne...
In recent years, developments in construction technology have resulted in structures increasing in both size and height, with related safety concerns also increasing. These structures may pose significant risks in scenarios where they suffer significant damage, for example, from external shock or the influence of aging. This paper proposes a wirele...
The strong-column weak-beam design criterion is widely used in seismic design procedures to prevent the abrupt collapse of reinforced-concrete (RC) frames and to secure their ductility capacity. However, many studies have demonstrated that the column-hinge collapse mechanism in RC frames can occur even if the strong-column weak-beam design criterio...