Mohammadreza Mashayekhi

Mohammadreza Mashayekhi
Sharif University of Technology | SHARIF · Earthquake Engineering

About

40
Publications
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277
Citations

Publications

Publications (40)
Article
This paper proposed a swift multi-objective optimization algorithm for the performance-based design of steel moment-resisting frame (MRF) buildings considering life-cycle cost (LCC). Two components of the life-cycle cost, including the initial construction cost and the lifetime seismic damage cost of the building, are considered as two separate obj...
Article
This study aims to show the efficiency of a proposed spectral matching technique for the reduction of required ground motions in the dynamic time history analysis. In this non-stationary spectral matching approach, unconstrained optimization is employed to adjust the signal to match a target spectrum. Adjustment factors of discrete wavelet transfor...
Preprint
Full-text available
Endurance Time (ET) method is a dynamic time history method in which structures are exposed to a set of pre-defined intensifying acceleration time histories that are generated artificially. These intensifying Endurance Time Excitation Functions (ETEFs) cover multiple seismic hazard levels with just a single time history analysis. Since the accuracy...
Preprint
Full-text available
Performance-based optimization of energy dissipation devices in structures necessitates massive and repetitive dynamic analyses. In the endurance time method known as a rather fast dynamic analysis procedure, structures are subjected to intensifying dynamic excitations and their response at multiple intensity levels is estimated by a minimal number...
Preprint
Full-text available
This study aims to show the efficiency of a proposed spectral matching technique for the reduction of required ground motions in the dynamic time history analysis. In this non-stationary spectral matching approach, unconstrained optimization is employed to adjust the signal to match a target spectrum. Adjustment factors of discrete wavelet transfor...
Article
Full-text available
Performance-based optimization of energy dissipation devices in structures necessitates massive and repetitive dynamic ‎analyses. In the endurance time method known as a rather fast dynamic analysis procedure, structures are subjected to ‎intensifying dynamic excitations and their response at multiple intensity levels is estimated by a minimal numb...
Article
Full-text available
This study aims at determining the critical seismic intensity at which cracks are expected to develop in a concrete arch dam. This intensity is referred to as crack initiation intensity. The crack initiation intensity measure implies that earthquakes with the intensity measure higher than this value are expected to induce cracks in the arch dam. Th...
Article
This study proposes a new approach to incorporate motion duration in incremental dynamic assessments. In the proposed methodology, at each intensity level, a simulation-based approach which is verified with actual data is employed to determine the median duration and the median acceleration spectra of ground motions expected to occur at the site. A...
Article
The endurance time method is a time history dynamic analysis in which structures are subjected to predesigned intensifying excitations. This method provides a tool for response prediction that correlates structural responses to the intensity of earthquakes with a considerably less computational demand as compared to conventional time history analys...
Article
Full-text available
The endurance time (ET) method is a dynamic analysis in which structures are subjected to intensifying excitations, also known as ET excitation functions (ETEF). The ET method is a tool for structural response prediction. The main advantage of the ET method over conventional approaches is its much lower demand for computational efforts. The concept...
Article
Full-text available
There are different kinds of intensity measures to characterize the main properties of the earthquake records. This paper proposes a simulation-based approach to compute correlation coefficients of motion duration and intensity measures of the earthquake ground motions. This method is used to investigate the influence of the ground motion data set...
Technical Report
Full-text available
Post-earthquake damage evaluation has indicated that although the buildings with shear walls exhibited an appropriate overall performance in the recent severe earthquakes, in some cases, however, the columns and the shear walls were damaged, due to the presence of short structural elements and inadequate transverse reinforcement. Such memories amon...
Preprint
Full-text available
Post-earthquake damage evaluation has indicated that although the buildings with shear walls exhibited an appropriate overall performance in the recent severe earthquakes, in some cases, however, the columns and the shear walls were damaged, due to the presence of short structural elements and inadequate transverse reinforcement. Such memories amon...
Article
Full-text available
This study proposes a response-based parameter for strong motion duration which is computed for structures and is the total time they are nonlinear during an earthquake. Correlation between structural response and duration for structures, subjected to a set of spectrum matched ground motions, is employed to examine the efficiency of the proposed me...
Preprint
Full-text available
This study proposes a new approach to incorporate motion duration in incremental dynamic assessments. Whereas it is demonstrated that motion duration can have a noteworthy impact on structural demands, duration has not directly been considered in the dynamic analyses. In the proposed methodology, duration consistent artificial ground motions are ge...
Preprint
Full-text available
Endurance time method is a time history dynamic analysis in which structures are subjected to predesigned intensifying excitations. This method provides a tool for response prediction that correlates structural responses to the intensity of earthquakes with a considerably less computational demand as compared to conventional time history analysis....
Article
Full-text available
This paper presents a particle swarm optimizer for production of endurance time excitation functions (ETEFs). These excitations are intensifying acceleration time histories that are used as input motions in endurance time (ET) method. The accuracy of the ET methods heavily depends on the accuracy of ET excitations. Unconstrained nonlinear optimizat...
Conference Paper
Full-text available
Strong-motion duration and number of cycles of motion are the well-known parameters with which earthquake engineers currently use to take into account the influence of motion duration for the dynamic analysis of structures. In addition to these prevalent means, using the number of nonlinear cycles-which a structure experiences during the motion-is...
Conference Paper
Full-text available
Quantification of the progressive failure of concrete dams subjected to seismic excitation is a vital step in dam safety risk evaluation. The risk-inform approaches require a comprehensive structural analysis for several specific ground motions to identify the potential failure modes. Probabilistic seismic hazard analysis, ground motion selection,...
Preprint
Full-text available
This study proposes a response-based parameter for strong motion duration which is computed for structures and is the total time they are nonlinear during an earthquake. Correlation between structural response and duration for structures, subjected to a set of spectrum matched ground motions, is employed to examine the efficiency of the proposed me...
Preprint
Full-text available
This paper aims to investigate the effects of motion duration on the structural seismic demands, seeking potential correlations between motion durations and structural responses at several seismic intensity levels. Three seismic levels with 100years, 475years, and 2475years earthquake return periods (RPs) are first considered for correlation comput...
Preprint
Full-text available
This paper presents a particle swarm optimizer for production of endurance time excitation functions. These excitations are intensifying acceleration time histories that are used as input motions in endurance time method. The accuracy of the endurance time methods heavily depends on the accuracy of endurance time excitations. Unconstrained nonlinea...
Article
Full-text available
This paper aims to investigate the effects of motion duration on the structural seismic demands, seeking potential correlations between motion durations and structural responses at several seismic intensity levels. Three seismic intensity levels with 100years, 475years, and 2475years earthquake return periods (RPs) are first considered for correlat...
Preprint
Full-text available
This paper proposes a simulation-based approach to compute correlation coefficients of duration and intensity measures of motions. It is used to investigate the influence of the ground motion data set selection using three simulation cases. In case one, simulated motions differ in terms of earthquake source parameters, site and source-to-site featu...
Preprint
Full-text available
Strong-motion duration and number of cycles of motion are the well-known parameters with which earthquake engineers currently use to take into account the influence of motion duration for the dynamic analysis of structures. In addition to these prevalent means, using the number of nonlinear cycles, which a structure experiences during the motion, i...
Article
Full-text available
A novel optimization method based on Imperialist Competitive Algorithm (ICA) for simulating endurance time (ET) excitations was proposed. The ET excitations are monotonically intensifying acceleration time histories that are used as dynamic loading. Simulation of ET excitations by using evolutionary algorithms has been challenging due to the presen...
Article
The aim of this study is to develop a new simulation procedure of endurance time excitations in which hysteretic energy compatibility is included. Existing methods for simulating excitations consider only amplitude and frequency content of motions and disregard parameters related to cumulative damage of structures. Hysteretic energy consistency, as...
Article
Endurance time method is a dynamic analysis in which structures are subjected to increasing excitations. These excitations are generated to be compatible with ground motions. Conventional excitation generating processes take into consideration the dynamic characteristics related to intensity and frequency contents of ground motions; however, durati...
Article
This paper puts forth a wavelet-based methodology for generating endurance time (ET) excitations. Conventional simulating practice expresses signals by acceleration values which are then computed via unconstrained nonlinear optimization. Dynamic characteristics of signals, including frequency content, are not represented directly in this type of va...
Article
The main objective of this study is the development of endurance time (ET) excitations in order to take structural response uncertainty into account for use in performance‐based earthquake engineering. There are several uncertainties in earthquake engineering, including earthquake occurrence, structural response, damage, and loss. In the current re...
Cover Page
Full-text available
It is clear that the frame with full height wall, while sustaining a bit more damage in lower intensities, turns out to be much more resilient at maximum intensity. This interesting finding is left for the viewer to discover: https://doi.org/10.1002/tal.1489
Article
Reinforced concrete (RC) dual systems are composed of RC moment‐resisting frames (MRFs) and RC shear walls, where MRFs are barely designed to handle gravity loads. Investigations have demonstrated that shear walls exert negative effects on the upper part of MRFs. In this paper, the interaction of shear walls and MRFs is inspected using endurance ti...
Conference Paper
Full-text available
Endurance Time (ET) method is an approximate nonlinear dynamic pushover procedure in which structures are exposed to a set of intensifying acceleration functions. In this paper, it is intended to check the accuracy of this method in predicting the nonlinear response of RC dual systems. In this case, a number of RC dual systems are designed and subs...
Article
The Endurance Time (ET) method is a dynamic analysis procedure using intensifying excitation. The ET excitation functions are generated so that structural performance can be assessed at different excitation levels in a single response history analysis. ET accelerograms, which have been generated so far, possess response spectra consistency; this me...
Conference Paper
Full-text available
The concepts of ET method and recent advances in its applications in seismic assessment of structures are reviewed. Endurance Time (ET) method is a response history based procedure in which structures are subjected to predesigned gradually intensifying dynamic excitation and their performance is assessed based on their response at different excitat...
Article
Endurance Time (ET) method is a dynamic analysis procedure using intensifying accelerograms which can be used to assess the structural performance at different excitation levels. In generation process of current ET accelerograms, the compatibility between acceleration spectrum produced by the ET accelerograms and acceleration spectrum associated wi...

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Projects

Projects (3)
Archived project
In this project, we will try to generate more accurate ET excitation functions (ETEFs), we will also try to check the efficiency of these ETEFs by employing them as seismic inputs for ETA
Archived project
Finding a new metric for strong motion duration, Getting an insight over the matters related to the influence of motion duration on the structural demands computed by the current dynamic analyses
Project
This is a "Call for Papers" for a special issue in the Journal of Advances in Mechanical Engineering (ISI IF = 1.02).