Seyed Rohollah Hoseini Vaez

Seyed Rohollah Hoseini Vaez
University of Qom · Civil Engineering

PhD

About

108
Publications
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865
Citations

Publications

Publications (108)
Article
The present study concerns the seismic optimization of steel moment frames in two interdependent stages initiated by controlling the requirements of limit state design method and followed by applying the performance-based design (PBD) method based on target roof displacements. In the first stage, structural adequacy is evaluated using LFRD method b...
Article
One new design method that is currently under consideration by researchers is performance-based design (PBD). This method has been evaluated using different criteria and definitions. In the current study, the weight optimization problem is defined using PBD to consider more constraints than have been considered in other studies in this field. The p...
Article
Given the limitations of equivalent pulses in investigating the effects of pulse-like ground motions, the present study is mainly aimed at providing an approach to capture the maximum response characteristics of steel moment resisting frames using the simulated pulses. Accordingly, the behavior of three moment resisting frames of 3, 9, and 20-story...
Article
In this study, inspired by the idea of the sequential optimization and reliability assessment (SORA) method, a new decoupled double-loop method for probabilistic performance-based design optimization (PPBDO) has been proposed. The highlight of the proposed method is the independence of this method from the type of problem and the limit state functi...
Article
An optimal performance-based design (PBD) of a three-dimensional (3D) structure requires repeated evaluation; thus, proposed approaches should attempt to significantly reduce the number of evaluations required during optimization. The current study proposes a multi-step approach for optimal PBD of a 3D steel moment frame in which the structure is e...
Article
In the science of structural and earthquake engineering, with the emergence of performance-based design (PBD), many researchers have focused their research on this field. The aim of PBD is to enable engineers to design structures that offer predictable performance. Height set-back in structures is a particular type of irregularity that has a signif...
Article
Increasing attention in quantitative and qualitative models has been paid to the dominant velocity pulse of the pulse-like ground motions. Manual trial and error approach for fitting of time history and response spectrum of the actual record and simulated pulse has been employed to obtain pulse parameters of these models. In this study, a mathemati...
Article
In this study, the weight and the connections type layout of low-rise eccentrically braced frame (EBF) have been optimized based on performance-based design method. For this purpose, two objective functions were defined based on two different aspects on rigid connections, in one of which minimization and in the other one, maximization of the number...
Article
There are two general methods of robust design optimization (RDO) and reliability-based robust design optimization (RBRDO) for the optimal design of structures with non-deterministic variables. In the problem-solving process of both RDO and RBRDO, assessing the probabilistic constraints of the problem and the standard deviation of the structural re...
Article
Full-text available
For an economical and safe design of building systems with concentrically braced frames, the layout of the braces should be done by considering all limitations. The current study proposes an approach for a reliability-based optimal design of concentric bracing layouts in 3D steel frames. The objective function was considered to be a reduction in th...
Article
Full-text available
Recent years have seen a significant increase in structural engineers' interest in the assessment of reliability and structural safety. The Reliability-Based Design Optimization (RBDO) method has been utilized to create the most efficient and safe design of structures. Although there have been several theoretical advances in reliability analysis, c...
Article
This article presents a novel model updating approach to the problem of structural damage identification. The approach is based on principal component analysis (PCA) of power spectral density (PSD) data obtained from incompletely measured structural responses. Damage detection was done by solving an innovative sensitivity equation based on least-sq...
Article
Full-text available
Reliability-based design can be used to simultaneously take into account economic aspects as well as safety considerations for various failure probabilities of structures. Such problems have two categories of deterministic and probabilistic constraints. Evaluating the probabilistic constraints and calculating the reliability index, usually require...
Article
Failing to account for the stochastic nature of structural parameters such as material properties, external loads and geometric dimensions, can cause uncertainty about the safety of the design of an engineering structure; thus, assessing the reliability of a design seems necessary. The present study considered uncertainty related to the statistical...
Article
Full-text available
The most commonly used analysis method in performance-based design (PBD) is nonlinear static analysis (NSA). In unsymmetrical 2D frames, unlike for the symmetrical state, NSA should be performed in two lateral loading directions. This complicates the process of achieving a feasible optimal design in addition to increasing the volume of calculations...
Article
Full-text available
Structural height set-back is a particular type of irregularity that affects the performance of the structure significantly. Therefore, researchers have always been interested in the effects of height irregularities on the seismic performance of such structures. The present study aimed to provide an optimal design based on the seismic performance o...
Article
Full-text available
The existence of uncertainties in engineering problems makes it essential to consider these effects at all times. Robust design optimization allows a design to be made less sensitive to uncertain input parameters. Actually, robust design optimization reduces the sensitivity of the objective function and the variations in design performance when unc...
Article
Full-text available
In recent years many researchers prefer to use metaheuristic algorithms to reach the optimum design of structures. In this study, an Enhanced Vibrating Particle System (EVPS) is applied to get the minimum weight of large-scale dome trusses under frequency constraints. Vibration frequencies are important parameters, which can be used to control the...
Article
Full-text available
Metaheuristic algorithms are preferred by the many researchers to reach the reliability based design optimization (RBDO) of truss structures. The cross-sectional area of the elements of a truss is considered as design variables for the size optimization under frequency constraints. The design of dome truss structures are optimized based on reliabil...
Article
Full-text available
A modified dolphin monitoring (MDM) is used to augment the efficiency of particle swarm optimization (PSO) and enhanced vibrating particle system (EVPS) for the numerical crack identification problems in plate structures. The extended finite element method (XFEM) is employed for modeling the fracture. The forward problem is untangled by some cycle...
Preprint
Full-text available
The most commonly used analysis method in performance-based design (PBD) is the nonlinear static analysis (NSA). In unsymmetrical 2D frames, unlike its symmetrical state, NSA should be performed in two lateral loading directions, which complicates the process of achieving a feasible optimal design in addition to increasing the volume of calculation...
Article
Full-text available
This study presents a new geometry-based crack detection approach for plate structures based on the integration of a dynamic extended finite element method (XFEM) and a physics-based optimization algorithm called enhanced vibrating particles system (EVPS). The so-called XFEM-EVPS method is applied to solve a forward problem. The problem is unravele...
Article
In structural design of steel frames, in order to achieve proper safety, the effect of uncertainties in the design and loading parameters of the structure must be considered. This approach is obtained by defining a reliability index. In this study, the Modified Dolphin Monitoring (MDM) operator was used to evaluate the reliability index of three we...
Conference Paper
Design procedures for reinforced concrete (R/C) structures often require ductile behavior. The ductile behavior can be provided by confining the concrete with the lateral or spiral reinforcement. Lateral or spiral reinforcements in R/C columns play an important role in enhancing the strength and ductility. The response of framed concrete structures...
Article
Full-text available
Nowadays, the optimal design of structures based on reliability has been converted to an active topic in structural engineering. The Reliability-Based Design Optimization (RBDO) methods provide the structural design with lower cost and more safety, simultaneously. In this study, the optimal design based on reliability of dome truss structures with...
Article
Full-text available
In this research, a new objective function has been proposed for optimal design of the Buckling Restrained Braced Frames (BRBFs) is performed using nonlinear time history analysis. The BRBF is a particular type of bracing system that has been widely utilized in recent years. The nonlinear time history analysis also provides a detailed view of the b...
Article
Due to the random nature of the variables affecting the analysis and design of structures, the reliability method is considered as one of the most important and widely used topics in structural engineering. Despite the simplicity of moment methods, the answer to problems with multiple design points (the point with the highest probability of failure...
Article
The current study investigated the optimum design of buckling restrained braced frames (BRBFs) subjected to seismic excitation. Nonlinear time history analysis was employed to examine the performance of the structures under seismic excitation. The objective function in the optimization problem was defined such that the weight of the structure and t...
Article
The sudden rupture of cable is one of the factors that can threaten the bridge safety; causing progressive collapse due to severe vibrations along with numerous changes in the internal forces of all bridge members. Therefore, analyzing the bridge behavior after the sudden cable rupture and estimating the maximum response of the bridge members is of...
Article
The failure probability (reliability index) and evaluation of safety of structures is a subject of interest in structural engineering. In order to calculate the reliability index, moment methods require an explicit mathematical form of the limit state function and gradient of this function, and simulation methods are dependent on a large number of...
Article
Considering the devastating effects of near-fault earthquakes, seismologists and engineers have, qualitatively and quantitatively, represented the strong velocity pulse of near-fault ground motions using models including physical parameters associated with the wave propagation process. In some mathematical models, the derivation of physical paramet...
Article
Full-text available
Due to the random nature of the variables affecting the analysis and design of structures, the reliability method is considered as one of the most important and widely used topics in structural engineering. Despite the simplicity of moment methods, the answer to problems with multiple design points (the point with the highest probability of failure...
Article
The paper presents an optimal design of steel curved roof frames with its roof being part of a circular arc. The elements of frames are tapered I-section members. In the objective function for optimization, two factors affecting the weight of frames are considered simultaneously. First, the roof slope angle as an effective variable on the values of...
Article
In this study, discontinuity layout optimization (DLO) was used to investigate the effect of openings on ultimate load and collapse patterns. DLO is an automated systematic procedure used in limit analysis for engineering problems to identify critical plastic collapse patterns for plates and slabs. Studies on reinforced concrete slabs with openings...
Article
Full-text available
In this study, a two-stage damage identification approach based on modal flexibility differences and whale optimization algorithm (WOA) was applied to localize and quantify damages in large-scale double-layer truss structures. In first stage, damage locating vector (DLV) method using EDS (exponential decreased stress) was employed to find the real...
Article
One of the objective functions used in damage detection problems is the one in which the difference of natural frequencies and mode shapes for the actual and computed damage scenarios are compared simultaneously. Using this type of objective function, one can locate the damage and quantify its severity in a single step. In this paper, a new version...
Article
In this paper a new multi-step damage detection approach is provided. In the first step, condensed modal residual vector based indicator (CMRVBI) has been proposed to locate the suspected damaged elements of structures that have rotational degrees of freedom (DOFs). The CMRVBI is a new indicator that uses only translational DOFs of the structures t...
Article
In this study, the Modified Dolphin Monitoring (MDM) operator is used to enhance the performance of some metaheuristic algorithms. The MDM is a recently presented operator that controls the population dispersion in each iteration. Algorithms are selected from some well-established algorithms. Here, this operator is applied on Differential Evolution...
Article
In this paper, a two-step damage detection approach is presented to identify the location and severity of multiple damage cases in large-scale truss structures. In the first step, a damage locating vector (DLV) method based on EDS (exponential decreased stress) considering modal flexibility differences is employed to localize the damaged elements o...
Article
Determining the optimum placement of braces in steel frames has always been one of the most challenging issues in structural engineering. In this paper, the size and placement of the X-braces in planar frame structures is determined in a way that the total weight of the braced frames becomes minimum, while satisfying the design requirements and con...
Article
Full-text available
Simplified Dolphin Echolocation (SDE) algorithm is a recently developed meta-heuristic algorithm. This algorithm is an improved and simplified version of the Dolphin Echolocation Optimization (DEO) method, based on the baiting behavior of the dolphins. The main advantage of the SDE algorithm is that it needs no empirical parameter. In this paper, t...
Article
Optimization problems can be defined and formulated with either discrete or continuous variables. This paper presents a continuous optimization method for the design of reinforced concrete shear walls, based on the concept of boundary element and with the reinforcement layout taken into consideration. Contrary to the discrete method, where algorith...
Article
In this article, a two-stage damage identification approach is employed to detect the site and extent of multiple damage cases in a 2D frame structure. In the first stage, Damage locating vector (DLV) method based on a new indicator called EDS (Exponential decreased stress) is applied to localize the damaged elements. Next, the damage extents of su...
Conference Paper
Engineering structures in the vicinity of causative earthquake faults have experienced severe damage during strong earthquakes of the past decade. Earthquake ground motions, recorded in near-fault zones differ from those observed in the far-fault regions. Near-fault ground motions often possess distinct characteristics, which can have strong influe...
Article
Full-text available
Vibrating Particles System (VPS) optimization is a recently developed metaheuristic algorithm for optimization. This algorithm is inspired by the free vibration of freedom systems' single degree with viscous damping. In this method, each answer is modeled as a particle that moves to its equilibrium position; new positions of the vibrating particle...
Article
In the conventional method of designing structures, a number of constants often characterize decisive parameters such as dimensions, material strengths and loads. Insufficient precision in modeling and implementing the structures are among the uncertainties that exist in structural design. If the maximum safety is expected for a structure, a combin...
Article
Full-text available
Earthquake force, loading more than structural capacity, cracking, material fatigue and the other unpredicted events were undeniable in the structure life cycle in order that environmental conditions of the structure would be changed and treats health. Damage of structures such as crack, corrosion of the post tension cables from inappropriate grout...
Article
In this article, a modified dolphin monitoring (MDM) operator is introduced and used to improve the performance of the colliding bodies optimization (CBO) algorithm for optimal design of steel structures (CBO MDM). The performance of the CBO, enhanced colliding bodies optimization (ECBO) and CBOMDM are compared through three well-established struct...
Conference Paper
Full-text available
The optimization plays important role in all fields, especially in civil engineering that economic issues have significant effect. Additional to optimizing, reliability is one of the main issues which exist due to attempt of human to reach better safety. Reliability is the ability of a system or component to perform its required functions under...
Article
Full-text available
This study has presented a method to estimate the damage location in the concrete gravity dam monolith. The first four vibration mode of the highest monolith of the Koyna dam was estimated and analyzed by the combined discrete and continuous wavelet transform. The position of the damage scenarios was identified by using bior 3.9 wavelet in the spat...
Article
In this study, a new approach for detecting damage, its location, and its severity in plate structures using a genetic–particle swarm optimization, which is a hybrid algorithm, is presented. To evaluate the proposed approach, three numerical examples have been simulated; the examples consist of three different plates including an L-shaped two-clamp...
Article
Nowadays, there are two classes of methods for damage detection in structures consisting of static and dynamic. The dynamic methods are based on studying the changes in structure's dynamic characteristics. The theoretical basis of this method is that damage causes changes in dynamic characteristics of structures. The dynamic methods are divided int...
Article
Full-text available
In this paper, a method of multiple cracks detection in a cantilever reinforced concrete beam based on wavelet transform is presented. For this purpose, different damage scenarios in concrete beam were considered. Then, the four first mode shapes of undamaged and damaged beam using ABAQUS software were extracted. The estimated mode shapes of the be...
Poster
Full-text available
Conference: 3th International Congress on Civil Engineering , Architecture and Urban Development, ICSAU2015, At Shahid Beheshti University, Tehran , Iran.
Article
Full-text available
In this study, a new mathematical model is developed composed of two parts, including harmonic and polynomial expressions for simulating the dominant velocity pulse of near fault ground motions. Based on a proposed velocity function, the corresponding expressions for the ground acceleration and displacement time histories are also derived. The prop...
Conference Paper
Full-text available
Although studies on reinforced concrete torsional strength beams with FRP sheets have been conducted, the behavior of beams reinforced with FRP sheets has not been fully understood. Thus, it is necessary to perform empirical tests as well as finding reliable and numerical methods to accurately predict the behavior of reinforced components. Therefor...
Conference Paper
Full-text available
Recent earthquakes have illustrated significant difference between seismic responses of structures in the vicinity of causative earthquake faults and those observed further away from the seismic source. Seismologists have identified forward directivity and fling effects as the primary characteristics of near-fault ground motions. It has been observ...
Article
Full-text available
Fiber reinforced polymers (FRPs) have found increasingly wide applications in structural engineering due to their high strength-to-weight ratio and high corrosion resistance. One important application of FRP-composites is as a confining material for concrete. In the investigation, new approach based on an intelligent predicting system (artificial n...
Article
Full-text available
Seismic response of structures in the vicinity of causative earthquake faults can be significantly different than those observed further away from the seismic source. In the near fault zone, ground motions are significantly influenced by the rupture mechanism and slip direction relative to the site and by the permanent ground displacement at the si...
Article
Shear wall with coupling beam is a very effective means of providing lateral bracing for buildings subjected to earthquakes. The strength, stiffness and ductility of coupling beams considerably influence the behavior of coupled wall systems, since even the local failure of each coupling beam could lead to the global failure of the structure. In thi...