Chung-Yue WangNational Central University | NCU · Department of Civil Engineering
Chung-Yue Wang
PhD
About
130
Publications
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1,320
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Introduction
NDT, structure health monitoring, fluid-structure interaction, motion analysis of discrete deformable blocks, underwater inspection of structure, bridge engineering, railway mechanics
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Education
August 1984 - May 1989
Publications
Publications (130)
This paper studies elastic stress wave propagation generated by an impact in a system consisting of a moving striker rod and an initially stationary semi-infinite rod. This research emphasizes the role of different general impedances in affecting the response during the wave propagation process. The Rayleigh–Love rod theory is used in this research...
This paper presents an in-depth study of the stress wave behavior propagating in a Rayleigh–Love rod with sudden cross-sectional area variations. The analytical solutions of stress waves are derived for the reflection and transmission propagation behavior at the interface of the cross-sectional area change in the rod, considering inertia and Poisso...
This paper presents an in-depth study of the stress wave behavior propagating in a Rayleigh–Love rod with a sudden cross-sectional area change. The analytical solutions of stress waves are derived for the reflection and transmission propagation behavior at the interface of the cross-sectional area change in the rod, considering inertia and Poisson’...
A bridge is an essential component of transportation networks and plays a crucial role in the operation of infrastructure, so maintaining this structure to guarantee the regular operation of bridges in a healthy condition is needed. The establishment of a bridge model numerically is a critical step of the bridge evaluation because many cases of the...
Non-destructive evaluation has been developed to identify cable tension for any end-rotational stiffness condition. One of the existing methods uses multiple vibration measurements. This paper aims to study the effect of shifting the closest sensor to the support in multiple vibration measurements through numerical simulation. A cable fixed at both...
Crack development is a clear indicator of the durability of concrete bridges. Traditional bridge inspections that rely inspectors to climb on bridges with lift cars are unsafe for inspectors and also time- and labor-consuming. Therefore, this research proposes a solution that applies unmanned aerial vehicles (UAV) and high-resolution digital camera...
The development of vibration-based tension determination has increased in recent years. The effective vibration length concept is one of the most robust methods in dealing with various end-rotational support stiffness. Recently, a two-mode combination approach by compelling multiple frequencies and effective lengths has been developed to replace th...
Analysis of a single-span bridge with rubber bearing as the isolation system is performed under earthquakes. The conventional bridge seismic design requires the whole structure to be perfectly connected to avoid interrupting the transfer of earthquake energy from the ground through the bridge. A bridge with this typical design requires a high-cost...
The determination of existing cable forces is essential for evaluating the performance of bridges. The vibration technique is preferred among available practical methods because it is simple, fast, and economical. To apply this method, many researchers introduced analytical and empirical formulas considering bending rigidity, cable length, and boun...
Most of the existing analytical solutions to the vibration of cable networks interconnected by cross-ties are developed based on string theory, where the effect of cable bending rigidity on cable vibration is ignored. However, the bending rigidity of cables strongly influences the natural frequencies and vibration mode shapes of short and stout cab...
Currently, flexural wave impulse response (IR) tests, which provide better accessibility for inspecting the partially exposed foundations of in-service bridges or buildings, are not used for frequency analysis due to the dispersion characteristics of bending waves at low frequencies. Despite a drawback at low frequencies, both the velocity and freq...
Inevitably, cable structure is often used as a structural part of either a middle or long-span bridge, so its existing tension force is essential to be evaluated and monitored periodically. This research aims to demonstrate the use of covariance type of Stochastic Subspace Identification (SSI-COV) to identify the dynamical system properties of brid...
Vibration-based approaches have been widely adopted in determining the cable tension force. The development of effective length concept has been successfully applied in revealing the cable force regardless type of end-restraints. Simultaneously, the two-mode frequency approach can determine the tension force without knowing the bending stiffness of...
Lacking substructure information usually challenges bridge agencies when evaluating the flood or earthquake resistance of bridges in disaster-prone areas. Appropriate substructure inspection techniques are essential for bridge engineers to develop repair strategies efficiently and reasonably allocate maintenance funds. In this article, the electric...
Concrete exposed to cyclic wetting and drying in salty water conditions is thought to be subjected to an accelerated ingress of chloride from the outside environment, and prone to a worsening deterioration process inside. Additionally, there is an osmotic effect on salty water flow in porous concrete. However, so far, a fully profound understanding...
A two-phase ultrasonic velocity tomography technique was introduced to inspect the concrete quality of bridge pylons in Taiwan. In phase I, the modified cross-hole sonic logging method was applied to rapidly identify the aberrant sections of pylon shafts and horizontal beams. Most of the concrete quality was classified as good (G), ie the apparent...
Developing an appropriate and efficient inspection pattern for an unknown bridge substructure is a critical issue for bridge engineers, contractors, and bridge agencies. This paper introduces a two-phase near-surface inspection strategy to determine the foundation depth of fully submerged pile bents of an existing bridge. Electrical resistivity tom...
Structure failure often occurs in the joint. This failure can adversely affect the comfort level of the structure. Knowing the behavior of interior beam-column joint structure resulting from the load is important, as it can help to predict the strength of the structure interior beam-column joint and comfort of the structure being worked on. One way...
Flexural Wave Impulse Response Evaluation of Pile Bent Foundations
In this paper, a foundation inspection strategy was developed to determine the condition on a fully-submerged pile bent foundation supporting an overwater vehicular bridge in Taiwan. The electrical resistivity tomography inspection displayed the overall conditions of the salt-content canal. Using the reciprocal principle-based ultra-seismic inspect...
The velocity tomography inspection, including modified cross-hole sonic logging and ultrasonic velocity tomography methods, was introduced to detect the reinforced concrete pylons of a pedestrian suspension bridge in northern Taiwan. At the first stage, the modified cross-hole sonic logging method was employed to rapidly identify the positions of g...
The guided wave theory has been introduced to determine the usable frequency range to reliably use the well-known one-dimensional wave theory to interpret impulse response testing results in pile foundations. Length-to-diameter ratio is usually considered a key factor to affect the analysis results. In this research, thirty-seven testing cases with...
A flexural wave impulse response approach is particularly applicable in the nondestructive evaluation of foundations of overwater structures, such as bridge piers or wharves, that lack access to their tops. The experimental procedure of the flexural wave impulse response method is similar to that of the traditional (longitudinal wave) impulse respo...
In this paper, the wavelet spectral finite element (WSFE) method is applied for studying the phenomenon of elastic wave propagating in a cracked beam structure. It is an inverse problem for identifying the location and depth of cracks in beams. The transient-state longitudinal and transverse waves are generated in an extended Euler-Bernoulli beam....
The conventional impulse response and ultra-seismic inspection techniques are commonly used to the integrity testing in concrete piles. The identification of anomaly position is one of the most critical issues in such non-destructive evaluation. A joint ultra-seismic inspection and impulse response experiment is developed on a traction-free detecte...
The vertical profiling ultra-seismic inspection is introduced to inspect model concrete piles under the traction-free and partially embedded conditions. Such a lateral impact inspection method is commonly used for inaccessible substructure tops, like pile bents. A frequency-based analysis based on the guided wave theory and resonance concept is dev...
The hydrodynamic loadings on underwater pipelines are essential parameters for pipeline design. This study integrates a Large Eddy Simulation (LES) model and the Volume of Fluid (VOF) method to examine the interaction between free surface flows and a horizontally-mounted circular cylinder. The simulated water depths and surface pressures on the cyl...
Energy dissipation mechamism is the key to study tsunami hazand mitigation. Numerical method is adopted to study the interaction between bores and square cylinders. The model solves the three-dimensional Navier–Stokes equations with Large-Eddy Simulation turbulence model. The Volume-of-fluid (VOF) method is used to track the complex free surface. W...
The purpose of this paper is to present a three-dimensional constitutive model based on the concept of equivalent uniaxial strain. closed Menetrey-Willam (CMW) failure surfaces which combined with Menetrey-Willam meridian and the cap model are introduced in this paper. Saenz stress-strain model is applied and adjusted by the ultimate strength param...
Concrete is a composite material composed mainly of water, sand, aggregate, and cement. The characteristics of high attenuation of concrete for ultrasound degrade the performance of ultrasonic testing (UT), especially when the size of the target is much smaller than the aggregate. Thanks to recent improvements in electronic devices and computing te...
A computationally efficient method is proposed for analyzing train and bridge dynamic interaction responses based on the vector form intrinsic finite-element method. The proposed method does not need to establish a large number of complicated dynamic coupling equations for the train and bridge, in contrast to the traditional finite-element method....
This paper presents a new approach to simulate the propagation of elastic and cohesive cracks under mode-I loading based on the vector form intrinsic finite element method. The proposed approach can handle crack propagation without requiring global stiffness matrices and extra weak stiffness elements. The structure is simulated by mass particles wh...
In this paper, several measurement instruments, including thermal fiber Bragg grating (FBG) sensor, strain gauge, non-contact displacement measurement technique, and GPS, have been applied to the case when a titling train Puyouma moved through the Tai’an Viaduct in Taiwan. Using measured information, consisting of vibrations on train, rail, and bri...
This study integrates a large eddy simulation model to investigate the effect of a submerged rectangular cylinder on the hydro-dynamics of free surface flows. The simulation results are validated by the results of flume experiments. Then the numerical model is utilized to examine the influences of Reynolds number, Froude number, and blockage ratio...
A probabilistic approach is used to create a preliminary inspection evaluation form (PIEF) for scour potential at bridge sites. In Taiwan, the risk of pier scour is often evaluated using a two-step procedure. First, a bridge is visually inspected based on a PIEF. An advanced scour risk analysis is conducted for a bridge with a high PIEF score. Beca...
Regularity visual inspections are performed on steel wire ropes of suspension bridges. However, because the steel wire ropes were coated with plastic materials, inspectors could not visually detect the deterioration conditions of the ropes. In this paper, radiation tests and electromagnetic testing were compared. The gamma rays used in the radiatio...
In civil engineering, imaging can be a useful non-destructive testing (NDT) tool for revealing defects in a concrete structure. To date, there is no effective method for imaging the defects inside in situ concrete structures. In this study, a new elastic wave-based NDT method has been developed and then applied to reveal the defects inside concrete...
With the advantages of easy coding and effortless mathematic-compiling, genetic algorithm (GA) is a popular optimization solver of artificial intelligence. However, converging to the local optimum may be a general problem of it. In order to overcome this drawback, a hybrid optimization algorithm integrating local model of particle swarm optimizatio...
This paper discusses the feasibility of detecting defects inside reinforced concrete (RC) structures by using multi-directional Synthetic Aperture Focusing Technique (SAFT) to create an image which contains the comprehensive information about the geometry of possible defects. This is achieved by scanning the structure in multiple directions and pro...
Inspection, monitoring and analysis techniques are the core techniques required for the performance evaluation and maintenance of railway system. Accelerometers, velocity meters, thermal couples, strain gauge, LVDT, optical FBG sensors and digital camera have been used to acquire the perform data of viaduct, track, train and power cable of railway...
Using elastic-wave-based NDT methods to detect defects in RC structures is difficult because of the interference of rebars. In this study, the interference effect on the quality of SAFT images was quantitatively explored using a series of numerical simulations. Furthermore, two concrete specimens were fabricated for experimental verification. The e...
Non-destructive testing (NDT) inspection has been verified to efficiently know the current conditioning of bridge foundations. In this paper, NDT techniques were required to inspect the unknown foundations on a damaged heritage railroad bridge for further rehabilitation in Taiwan. Three proposed NDT methods, electrical resistivity tomography, ultra...
This paper develops the point-by-point impact vibration method, a damage diagnosis method for beam structures. The theoretical development and experimental verification were carried out on aluminum beams with single and double cracks in the vertical direction and on pre-stressed concrete beams with local breaks. The processing signals were the time...
In this study, a nondestructive testing method based on stress waves, the impact echo method, was applied to inspect the current thickness of a refractory wall inside a blast furnace. Blast furnaces are high-productivity structures that are prone to internal erosion hazards that majorly affect the lifespan of the blast furnace. Previous studies hav...
This study developed a novel two-way dynamic coupled numerical model to simulate moving solids in free surface flows. The fluid flows and hydrodynamic pressures are simulated by a Large Eddy Simulation model, and the free surface is tracked by the Volume-of-Fluid (VOF) method. The fluid response from the solid motion is modeled through specifying t...
In this paper, analytical simulations of the steel-laminated elastomeric bearing (SLEB) using a three-dimensional (3D) finite element model incorporating material, geometric nonlinearities, and a frictional contact algorithm in LS-DYNA code is conducted. In order to simulate the nonlinear responses of the elastomeric bearing under the compression a...
To overcome the difficulty of integrating continuous/discontinuous numerical methods to a software and retain its flexibility at the same time, National Center for Research on Earthquake Engineering (NCREE) under National Applied Research Laboratories (NARL) in Taiwan has designed a Versatile Engineering Simulation ENvironment (named VESEN), which...
With the development of high-density intercity railway networks, substantial investments are now required, in terms of labor and machinery, in order to be able to conduct safety inspections. This results in high operational costs. High-capacity and high-speed operations have resulted in levels of damage and deterioration of railway system component...
It is important to simulate the entire-process collapse of earthquake excited cable-stayed bridge in order to assure the damage extent under strong earthquakes and to optimize the anti-collapse seismic measures. The newly developed vector form intrinsic finite element (VFIFE) method is capable of computing large deformation, large displacement, col...
The exposure of pier foundations owing to scour significantly reduces the foundation-bearing capacity and diminishes the flood-resistant capacity of a bridge. This paper proposes a nonlinear quasi-static analysis procedure for the performance of bridges with pile foundations under flow-induced loads for the evaluation on the flood-resistant capacit...
The failure of the Shuang-Yuan Bridge in Taiwan caused by floods associated with Typhoon Morakot in August 2009 prompted this forensic investigation into its causes. The investigation found multiple factors for the bridge failure: (1) flood flows, (2) river-bend-induced skewed flow, and (3) the effects induced by extended foundation caps and rafted...
In Taiwan, many bridges span rivers that exhibit severe channel variations in response to drastically increased flows and resulting floods caused by typhoons and storms. Flood-induced scour can undermine the effective embedment depth of bridge foundations. The Shuang-Yuan Bridge, spanning a downstream section of the Kaoping Stream, was severely dam...
A tsunami may result in severe local scour and causes heavy damages on structures in the coastal area. In this paper, a 3D multi-phase rheological model that incorporates the quadratic Bingham model is developed to simulate the local scour problems. A quadratic term is added to the traditional Bingham model to represent the effect of sediment colli...
Non-destructive testing (NDT) has been verified to efficiently know foundation conditioning. In this paper, NDT techniques were required to inspect the bridge foundations with high scour potential in Taiwan. The electrical resistivity tomography was proposed to conduct to the inspection on three commonly-used foundation types of bridges. This techn...
In this paper, a set of the procedures of the numerical simulation for the buried pipeline is proposed. These numerical procedures are used to compute the large deformations of the buried pipeline through the fault. In order to simulate the fault slip, displacement control is adopted. The geometric and material nonlinearity of buried pipe are consi...
In this paper, the nonlinear analysis of the motion structures is studied by using the vector form intrinsic finite element (VFIFE, V-5) method. The main object of this research is to develop an internal hinge of two ends of the plane frame element. In this study, the hinge function of frame element is used to compute the nonlinear dynamic response...
In this study, wind tunnel experiments and a Large Eddy Simulation (LES) model were used to investigate the protective effect of porous windbreak on road vehicles against crosswind. The model prediction of the side force and lift coefficients compared favorably with the wind tunnel experiments of vehicles on the ground. The simulation results of th...
Scour is the number one cause of bridge failure in many areas. A better procedure on scour potential evaluation
and inspection technique plays an important role to avoid or mitigate possession and life loss. In this paper, a proposed scour inspection procedure is developed as a five-phase routine each inspection cycle in Taiwan. Those phases clearl...
Local scour is the major problem causing bridge failures in Taiwan. In this paper, the proposed three-dimensional (3-D) numerical fluid-solid coupled scour model is based on the development of the Bingham rheological theory coupled with volume-of-fluid model. The validated model is applied to simulate the Shuang-Yuan Bridge failure by Typhoon Morak...
The requirements for inspection and management of track irregularity have to be more rigorous due to safety and serviceability concerns as the increment of the train speed of high-speed train. The wavelength of track irregularity significantly affects running safety and riding comfort. To improve inspection, operation, efficiency, and address, the...
Bridges in Taiwan confront scour challenge induced by typhoons and storms. Based on economic consideration, a two-phase assessment process on the safety of bridge scour is proposed and served as a rapid/inexpensive inspection of scour potential first and a detailed quantitative evaluation later. An in-situ visual inspection obtains its rating of sc...
An upgraded piezoelectric film type real-time scour monitoring sensor installed along the bridge pier is presented. The core idea of developing this scouring sensing system is based on the physical characteristic that output voltage can be generated as the piezoelectric film is deformed by the flowing media. Therefore, a sensing device can be const...
This paper presents a new approach of health monitor using the curvature of the influence line. The study included numerical simulation and experimental test of H-beam to demonstrate the effectiveness of the new approach. The specific work includes: loading test method for moving vehicular to measure displacement influence line of beam structure, o...
Approximate 200 highway bridges in Taiwan are damaged in Typhoon Morakot event in August, 2009. The flood-induced multiple natural hazards, such as flood, landslide, debris flow, drafting wood, and barrier lakes, cause embankment erosion, discharge loss, overflow accompanying with debris, vibratory river bending, etc. around bridges. Identifying di...
This paper discusses the application of position-sensitive detector (PSD) technology to a real bridge for the purpose of health monitoring. The PSD system consists of two parts: the assembly of PSD targets with mounted LEDs for emitting light spots, and the PSD light-spot capturer for tracking the sensing lights. To verify the performance and relia...
There were 13 standard spans of variant span length and pier height tested at early stage of Taiwan High Speed Railway's operation. The test was aimed to verify the actual dynamic responses meeting the design code, and to establish the initial values of bridge structure dynamic behaviors. In this test, triaxial accelerometers and triaxial velocimet...
This paper presents an experimental study of a new assessment of track irregularity based on a new inverse analysis method. Two tri-axial accelerometers are mounted on the axel box of a track recording vehicle to measure the dynamic response. And according to the acceleration responses at axel box, the spatial path of the moving wheel on the track...
In this paper, we present a two-way coupled moving solid algorithm with discrete element method (DEM) to simulate dynamic fluid-solid interaction. This model allows obstacles moving in the multi-phase fluids to generate realistic motion for both the fluids and obstacles. We discretize the Navier- Stokes equation using finite volume method (FVM) for...
To install the continuous welded rail (CWR) on the viaduct, it is necessary to consider the accumulated axial force owing to temperature difference and the additional force of the rail exerted by the track-bridge expansion as a result of temperature difference, the so-called track-bridge interaction. This paper used A-thermal fiber bragg grating (F...
Typhoon Morakot severely damaged approximate 200 highway bridges in Taiwan in August, 2009. The induced multiple natural hazards, such as flood, landslide, debris flow, drafting wood, and barrier lakes, caused embankment erosion, discharge loss, overflow accompanying with debris, vibratory stream bending, etc. around bridges. Both traditional and i...
The main object of this paper is to apply the vector form intrinsic finite element (VFIFE, or V-5) techniques in nonlinear large deformation dynamic analysis for the responses of moving loads on rigid frame structures. In this study, the simulation of moving loading is brought into the vector form intrinsic finite element method. It can effectively...
A useful nondestructive testing tool for civil engineering should immediately reveal defects inside concrete structures at the construction sites. To date, there are few effective methods to image defects inside concrete structures. In this paper, a new nondestructive testing method using elastic waves for imaging possible defects inside concrete i...