Mohsen Khatibinia

University of Birjand · Civil Engineering

The efficacy of a tuned mass damper (TMD) in dissipating the seismic energy transmitted to a structure depends on the TMD's and structure's characteristics and the structural response(s) that the TMD is intended to control. This study presents an approach to designing TMDs considering seismic damage as a representative of structural response. Damag...

Active tuned mass damper (ATMD) as a reliable active device of structural control can protect structures subjected to earthquake excitations from the severe seismic damages. The present study focus on the design of an adaptive sliding sector controller (ASSC) employed in the ATMD system to mitigate the seismic responses of an 11-story shear buildin...

This study investigate the soil-structure interaction (SSI) effects on the seismic performance of steel moment-resisting frames (SMRF) equipped with optimal rotational friction dampers (RFDs). Firstly, a simultaneous optimal design based on the energy concepts is expanded to find the optimal placement and the corresponding optimal parameters of the...

The active tuned mass damper (ATMD) is an efficient and reliable structural control system for mitigating the dynamic response of structures. The inertial force that an ATMD exerts on a structure to attenuate its otherwise large kinetic energy and undesirable vibrations and displacements is proportional to its excursion. Achieving a balance between...

Detection of damages in structures during their service life is of vital importance and under attention of researchers. In this paper, it is attempted to identify damages in prestressed concrete slabs using vibration responses obtained from modal testing in the time domain. For this purpose, first some damage scenarios with various geometric shapes...

In this paper, the location and severity of damages in prestressed concrete slabs are assessed using the contourlet transform as a novel signal processing method. To achieve this goal, the numerical models of prestressed concrete slabs were built based on the experimental specimens reported in the previous research works. Then, the single, double,...

The high ductile of steel moment-resisting frames (SMRFs) during earthquakes has been challenged due to the brittle fractures of their welded (rigid) beam to column connections. Consequently, SMRFs have suffered severe damages and have produced collapse in main structural members (such as beams and columns). During previous years, energy dissipativ...

The high ductile of steel moment-resisting frames (SMRFs) during earthquakes has been challenged due to the brittle fractures of their welded (rigid) beam to column connections. Consequently, SMRFs have suffered severe damages and have produced collapse in main structural members (such as beams and columns). During previous years, energy dissipativ...

The low-cycle fatigue performance of shear panel damper (SPD) highly depends on the geometry of its shape and the criterion considered for its design. The main contribution of the current study is to find the optimum shape of the SPD subjected to cyclic loading by considering two different objective functions. The maximum equivalent plastic strain...

The present paper proposes the simultaneous optimization of the placement and parameters of rotational friction dampers (RFDs) for the seismic protection of a nonlinear steel moment-resisting frame (SMRF). In that respect, the placement and parameters of RFDs in the framework of an optimization problem is simultaneously optimized for a ten-story SM...

Modern building codes increasingly enforce evaluating the inelastic response of structures to ensure their safety in major seismic events. Although an inelastic dynamic analysis provides the most realistic and accurate measure for the seismic response, its application for large-scale structures is hampered by the excessive computational burden invo...

Active tuned mass damper (ATMD) systems have attracted the considerable attention of researchers for protecting buildings subjected to earthquake loading. This paper presentes the development of an optimal sliding mode control (OSMC) system for a building equipped with ATMD. In the OSMC technique, a linear sliding surface is used with the slope of...

The present study proposes a hybrid of the piecewise constant level set (PCLS) method and isogeometric analysis (IGA) approach for structural topology optimization. In the proposed hybrid method, the discontinuities of PCLS functions is used in order to present the geometrical boundary of structure. Additive Operator Splitting (AOS) scheme is also...

While the bottom soil of the foundation is supposed to be rigid and the flexibility effect is ignored, the seismic response of the structure is affected by dynamic properties of the structure, and the soil flexibility does not have any effect on the response of the structure. Hence, considering the results obtained by analyses based on the fixed ba...

The main idea of this study is to investigate and compare the efficiency of the dynamic relaxation methods (DRMs) in the form–finding of tensile membrane structures (TMSs). The form–finding process as a main stage in the design and construction of TMSs has been considered for finding an equilibrium configuration subjected to a specific pre–stress d...

Rotational friction dampers (RFDs) have been proposed as one of the passive control devices in order to enhance the seismic performance of inelastic structures and dissipate the input energy of earthquakes through friction in their rotating plates. The efficiency, performance and design of an RFD strongly depend on its frictional moment and the len...

Many researches have focused on the optimal design of tuned mass damper (TMD) system without the effect of soil–structure interaction (SSI), so that ignoring the effect of SSI may lead to an undesirable and unrealistic design of TMD. Furthermore, many optimization criteria have been proposed for the optinal design of the TMD system. Hence, the main...

U-shaped steel damper (USSD), as an energy dissipation device, has been recommended in the literature for using in the isolation systems. This type of damper is capable of appropriately dissipating the input energy which a structure imparts from an earthquake. The capability is provided through a large range of plastic deformations occurred in the...

This paper mainly studies the shear characteristics of reinforced concrete beams manufactured by introducing coarse recycled aggregate (RA) and steel fibres. For that purpose, 27 concrete beams (15 cm, 20 cm and 150 cm of width, height and length, respectively) with dissimilar spacing of transverse reinforcement (TR) were produced. Additionally, th...

Flow number of asphalt-aggregate mixtures as an explanatory factor has been proposed in order to assess the rutting potential of asphalt mixtures. This study proposes a multiple-kernel based support vector machine (MK-SVM) approach for modeling of flow number of asphalt mixtures. The MK-SVM approach consists of weighted least squares-support vector...

This paper mainly studies the shear characteristics of reinforced concrete beams manufactured by introducing coarse recycled aggregate (RA) and steel fibres. For that purpose, 27 concrete beams (15 cm, 20 cm and 150 cm of width, height and length, respectively) with dissimilar spacing of transverse reinforcement (TR) were produced. Additionally, th...

The shear loading applied to structures is resisted by implementation of hysteric dampers as structural seismic force resisting system. Recently, steel plates with engineered cut-outs are introduced to have controlled yielding. These structural elements behave as shear links are able to post pone brittle limit states, leading to resistance against...

This paper identifies the damage in concrete slabs with the help of contourlet as one of the novel signal processing methods. In the numerical example, on a prestressed concrete slab, in which is validated by modal test results on laboratory samples, three false damage modes are produced in different locations. Then, the differences of first modal...

Tuned mass dampers (TMDs) are a subclass of dynamic vibration absorbers that consist of a mass-spring-damper unit that is attached to a structure to adjust its response to seismic and wind loads. The efficacy, performance and optimum design of a TMD strongly depend not only on its mass, stiffness and damping as well as the input energy and the stru...

در این مقاله، به آنالیز حساسیت پارامترهای میراگر اصطکاکی دورانی پرداخته شده است. میراگر اصطکاکی دورانی در نرم¬افزار OpenSees مدل¬سازی شده است و با لینک¬کردن آن با نرم¬افزار Matlab، فرایند تغییر مقادیر پارامترها و محاسبه جواب¬ها به ازای آن¬ مقادیر انجام شده است. در مرحله اول، طول صفحات افقی و قائم میراگر و در مرحله دوم، ممان اصطکاکی لغزش و نیروی پیش...

Iran is always in danger due to its presence on the Alpide seismic belt. Understanding the behavior of structures and earthquake-resistant systems in the structures helps us in the design of the structures. One of the methods for structural rehabilitation against lateral loads is using braces. In order to increase the energy dissipation due to the...

Tuned mass dampers (TMD) have been widely used as one of vibration controlled devices in order to reduce the response of buildings subjected to lateral loads such as earthquake loads. Although the optimal design of TMD subjected to earthquake has received much attention of researchers, finding the most severe earthquake for this purpose has been we...

Solving the governing equations of a system is the most important issues that is always discussed in science and engineering fields. Since there are few equations that have analytical solution, many numerical methods have been proposed for solving the equations that have no analytical solutions. Numerical methods are developed by the advent of comp...

The staggered-truss system has been proposed as a lateral load resisting system in the structural steel framing for high-rise buildings, which was developed in Massachusetts Institute of Technology in 1960s. The system consists of a series of storey-high trusses spanning the total width between two rows of exterior columns and arranged in a stagger...

In recent decades, groundwater flow modeling is required due to reduced rainfall and the management of water resources and predictions. In these models, a differential equation is considered for the whole system which can be soled by several numerical methods such as finite difference, finite element method, and meshless method. Recently, a newer m...

This paper presents the topology optimization of plane structures using a binary level set (BLS) approach and isogeometric analysis (IGA). In the standard level set method, the domain boundary is descripted as an isocountour of a scalar function of a higher dimensionality. The evolution of this boundary is governed by Hamilton–Jacobi equation. In t...

Tuned mass damper (TMD) has been proposed as one of the vibration control methods for rehabilitation of buildings. Because the parameters of TMD can significantly affect the seismic performance of structures, many researches focused on finding the optimum parameters. Because earthquakes are random phenomena and future earthquakes in comparison with...

در دهه های اخیر به دلیل کاهش بارندگی و به¬منظور مدیریت منابع آب و پیش¬بینی¬های لازم، نیاز به مدل¬سازی جریان آب زیرزمینی می¬باشد. در این مدل¬ها برای کل سیستم، یک رابطه دیفرانسیل در نظر گرفته می¬شود و توسط روش¬های عددی متعددی مانند تفاضل محدود، روش اجزای محدود و روش بدون مش حل می¬گردد. اخیرا از روش جدیدتری به نام روش تحلیل ایزوژئومتریک استفاده میشود....

Controlling the maximum acceleration and displacement of the roof within the acceptable range is important and essential. In order to control structures, a number of control systems have been introduced that are categorized into four system including active, passive, semi active and hybrid system. One of the most used passive systems is the tuned m...

In the design process of a moment resisting frame (MRF), the principle of weak–beam and strong–column should been considered because of the occurrence of plastic hinge in the beams. This mechanism is caused because the frame is capable of dissipating significant energy and remaining stable in the inelastic region. Stability is defined as the abilit...

Weak local exploitation capability of the gravitational search algorithm (GSA) and its slow convergence rate in final iterations have been demonstrated in the literature. This paper presents a modified GSA denoted here as the accelerated multi-gravitational search algorithm (AMGSA) that exhibits an improved convergence rate. In AMGSA, the simplex c...

In spite of the advances in the development of efficient computational methods, reliability-based design optimization (RBDO) of large-scale structures subjected to seismic loading still requires prohibitive computational effort. Additional difficulties arise for the optimum design of reinforced concrete (RC) structures because they typically featur...

Nowadays, frames with buckling restrained braces are used as a lateral resistant system in seismic design of structures. Due to the non-buckling in compression, they have the same behavior in tension and compression as well as stable hysteresis pattern. But these braces also have disadvantages too. One of these disadvantages is the creation of perm...

h i g h l i g h t s Effect of nano-CuO in PP reinforced SCCs were assessed. Mechanical and durability properties were studied. Addition of PP resulted in substantial increase in flexural and tensile strength of the SCCs. The microstructure was investigated by SEM photos. Three SVM approaches were used to predict the compressive strength. a b s t r...

The main contribution of the present paper is to propose an intelligent fuzzy inference system approach for modeling the debonding strength of masonry elements retrofitted with Fiber Reinforced Polymer (FRP). To achieve this, the hybrid of meta-heuristic optimization methods and adaptive-network-based fuzzy inference system (ANFIS) is implemented....

This study investigates the prediction model of compressive strength of self–compacting concrete (SCC) by utilizing soft computing techniques. The techniques consist of adaptive neuro–based fuzzy inference system (ANFIS), artificial neural network (ANN) and the hybrid of particle swarm optimization with passive congregation (PSOPC) and ANFIS called...

The main aim of this study is to predict the compressive and flexural strengths of self–compacting mortar (SCM) containing nano–SiO2, nano–Fe2O3 and nano–CuO using wavelet–based weighted least squares–support vector machines (WLS–SVM) approach which is called WWLS–SVM. The WWLS–SVM regression model is a relatively new metamodel has been successfull...

Tuned mass dampers (TMDs) are as a efficient control tool in order to reduce undesired vibrations of tall buildings and large–span bridges against lateral loads such as wind and earthquake. Although many researchers has been widely investigated TMD systems due to its simplicity and application, the optimization of parameters and placement of TMD ar...

This paper proposes a hybrid of topological derivative-based level set method (LSM) and isogeometric analysis (IGA) for structural topology optimization. In topology optimization a significant drawback of the conventional LSM is that it cannot create new holes in the design domain. In this study, the topological derivative approach is used to creat...

The paper deals with the reliability–based design optimization (RBDO) of concrete gravity dams subjected to earthquake load using subset simulation. The optimization problem is formulated such that the optimal shape of concrete gravity dam described by a number of variables is found by minimizing the total cost of concrete gravity dam for the given...

This study focuses on the shape optimization of concrete gravity dams considering dam–water–foundation interaction and nonlinear effects subject to earthquake. The concrete gravity dam is considered as a two–dimensional structure involving the geometry and material nonlinearity effects. For the description of the nonlinear behavior of concrete mate...

This study focuses on the topology optimization of structures using a hybrid of level set method (LSM) incorporating sensitivity analysis and isogeometric analysis (IGA). First, the topology optimization problem is formulated using the LSM based on the shape gradient. The shape gradient easily handles boundary propagation with topological changes....

The main aim of this study is to introduce optimal design of homogeneous earth dams with oblique and horizontal drains based on particle swarm optimization (PSO) incorporating weighted least squares support vector machine (WLS–SVM). To achieve this purpose, the upstream and downstream slopes of earth dam, the length of oblique and horizontal drains...

In structural optimizations through meta-heuristic algorithms, analyses of structures are performed for many times. For this reason, performing the analyses in a time saving way is precious. The importance of the point is more accentuated in time-history analyses which take much time. To this aim, peak picking methods also known as spectrum analyse...

Truss optimization on shape and sizing with frequency constraints is introduced as one of highly non– linear dynamic optimization problems with several local optima. In this paper, a hybrid approach based on the combination of multi–gravitational search algorithm (MGSA) and differential evolution (DE), called MGSA–DE, is proposed to efficiently fin...

A reliable seismic-resistant design of structures is achieved in accordance with the seismic design codes by designing structures under seven or more pairs of earthquake records. Based on the recommendations of seismic design codes, the average time-history responses (ATHR) of structure is required. This paper focuses on the optimal seismic design...

A two-stage meta-heuristic optimization model is introduced to find the optimal shape of double-arch concrete dams. The main aim is that computational merits of the continuous ant colony optimization (ACOR) and the particle swarm optimization (PSO) be integrated. This proposed method called ACOR–PSO can accelerate the capability of exploitation and...

Ghanats are water structures of Iranian invention. Groundwater extraction is transferred by Ghanat, with the force of gravity and from underground and away from the evaporation. Structure of Ghanats created in Iran was changed from the used state to unused state, and the resistant structures or Kaval were used in order to prevent the destruction of...

Structural optimization on shape and sizing with frequency constraints is well-known as a highly nonlinear dynamic optimization problem with several local optimum solutions. Hence, efficient optimization algorithms should be utilized to solve this problem. In this study, orthogonal multi-gravitational search algorithm (OMGSA) as a meta-heuristic al...

A hybrid approach based on an improved gravitational search algorithm (IGSA) and orthogonal crossover (OC) is proposed to efficiently find the optimal shape of concrete gravity dams. The proposed hybrid approach is called IGSA-OC. The hybrid of IGSA and the OC operator can improve the global exploration ability of the IGSA method, and increase its...

The performance of buildings subjected to earthquake loads has shown that asymmetric structures are caused more extensive damages in comparison with symmetric structures. Hence, the seismic performance of asymmetric structures should be assessed due to future random earthquakes. Reliability-based seismic assessment as one of the tools in performanc...

A new discrete gravitational search algorithm (DGSA) and a metamodelling framework are introduced for reliability-based design optimization (RBDO) of reinforced concrete structures. The RBDO of structures with soil–structure interaction (SSI) effects is investigated in accordance with performance-based design. The proposed DGSA is based on the stan...

An efficient metamodeling framework in conjunction with the Monte-Carlo Simulation (MCS) is introduced to reduce the computational cost in seismic reliability assessment of existing RC structures. In order to achieve this purpose, the metamodel is designed by combining weighted least squares support vector machine (WLS-SVM) and a wavelet kernel fun...

An efficient method for size and layout optimization of the truss structures is presented in this paper. In order to this, an efficient method by combining an improved discrete particle swarm optimization (IDPSO) and method of moving asymptotes (MMA) is proposed. In the hybrid of IDPSO and MMA, the nodal coordinates defining the layout of the struc...

An efficient method for size and layout optimization of the truss structures is presented in this paper. In order to this, an efficient method by combining an improved discrete particle swarm optimization (IDPSO) and method of moving asymptotes (MMA) is proposed. In the hybrid of IDPSO and MMA, the nodal coordinates defining the layout of the struc...

In this study, an efficient method is introduced to predict the stability of soil-structure interaction (SSI) system subject to earthquake loads. In the procedure of the nonlinear dynamic analysis, a number of structures collapse and then lose their stability. The prediction of failure probability is considered as stability criterion. In order to a...

This paper deals with the evaluation of seismic behaviour of reinforced concrete moment resistant frames (RC-MRFs) considering soil-structure interaction (SSI) effects. In this study, a three-bay nine-storey RC-MRF is optimally designed based on the design codes recommendations. To investigate the SSI effects on the seismic behaviour of the frame,...

A hybrid meta-heuristic optimization method is presented to efficiently find the optimal shape of concrete gravity dams including the dam-water-foundation rock interaction subject to earthquake loading. The proposed method is based on a hybrid of the gravitational search algorithm (GSA) and particle swarm optimization (PSO), which is called GSA-PSO...