Mojtaba Harati

Mojtaba Harati
Colorado State University | CSU · Department of Civil & Environmental Engineering

MS of Earthquake Engineering
Working with IN-CORE platform as an RA!

About

39
Publications
10,797
Reads
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121
Citations
Additional affiliations
February 2015 - November 2020
University of Science and Culture
Position
  • Instructor
December 2014 - present
Shahr-e Omran Company
Position
  • Designer
September 2011 - June 2014
Sharif University of Technology
Position
  • Master's Student
Education
September 2011 - June 2014
Sharif University of Technology
Field of study
  • Earthquake Engineering

Publications

Publications (39)
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...
Code
This is a Matlab code to solve Example 5.6 of the Matrix Analysis book by Prof. Aslam Kassimali. Link of the book in Amazon: https://www.amazon.com/Matrix-Analysis-Structures-Aslam-Kassimali/dp/1111426201/ref=sr_1_2?dchild=1&qid=1632868686&refinements=p_27%3AAslam+Kassimali&s=books&sr=1-2
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
A computational strategy is proposed to circumvent some of the major issues that arise in the classical threshold-based approach to discrete topology optimization. These include the lack of an integrated element removal strategy to prevent the emergence of hair-like elements, the inability to effectively enforce a minimum member size of arbitrary m...
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
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
Past severe earthquakes, such as Bam earthquake of 2003 and Tabas earthquake of 1978, have demonstrated that many cities in Iran are prone to be struck by near-fault earthquakes. Such earthquakes are impulsive in nature, and therefore, they are more destructive than the ordinary ground shaking. In the fourth edition of Iranian seismic code (Standar...
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...
Preprint
Full-text available
Past severe earthquakes, such as Bam earthquake of 2003 and Tabas earthquake of 1978, have demonstrated that many cities in Iran are prone to be struck by near-fault earthquakes. Such earthquakes are impulsive in nature, and therefore, they are more destructive than the ordinary ground shaking. In the fourth edition of Iranian seismic code (Standar...
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...
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
Presentation
Full-text available
Topology optimization as a powerful technique for computational free-form design has allowed for the discovery of high-performance structures. This technique can be applied for designing efficient discrete structures and lattice-like material micro-architectures. Discrete topology optimization usually starts with a dense initial lattice of structur...
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...
Presentation
Full-text available
This presentation file is in the Persian language. Please download this file to see its content in a better way.
Poster
Full-text available
Harati M, Roudsari M. S. (2016), “A page-long introduction on the Seismosoft commercial packages”, Magazine of Art and Technology, 20 (47), pp. 122 (in Persian)
Presentation
Full-text available
Please download this file to see its content in a better way. Link for download: http://www.guilan-nezam.ir/namayesh/matlab.aspx?i=3584
Conference Paper
Full-text available
Steel frames are the most significant structural systems in the construction industry. Among many forms of such frames, braced frame is built commonly all around the world. In these structural systems, brace elements are used to resist the lateral loads imposed by ground shakings. Many investigators are trying to get insight into the real behavior...
Conference Paper
Full-text available
A special steel beam-to-column connection, named Khor-jini, is commonly used for steel framing systems in Iran. In this system, two continuous beams are passed next to the columns and are connected to the column side using seated brackets.This type of connection has been common in Iran for a long time. Unfortunately, the seismic behavior of Khor-ji...
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...
Conference Paper
Full-text available
Nowadays, RC structural systems are being used in construction industry worldwide. The observed response of medium rise building, based on post-earthquake damage assessment reports, during the latest earthquakes in the USA, Chile, Mexico and Japan have indicated that buildings including shear walls and dual structural systems behave considerably be...
Presentation
Full-text available
Presentation file of my MSc thesis
Thesis
Full-text available
Post-earthquake damage evaluation has indicated that although the buildings with shear walls exhibited an appropriate overall performance in the recent sever earthquakes, in some cases, however, the columns and the shear walls were damaged, due to presence of short structural elements and inadequate transverse reinforcement. Such memories amongst e...

Questions

Question (1)
Question
*An attenuation Eq for motion duration vs. a function for PGA, for example.
We are not sure whether or not there is any correlation between the residuals of two attenuation equations, one for motion durations and the other one for intensity measures (PGA or SA). And how we can quantify this possible correlation if they are correlated to each other.
- This question is also visually described and attached to this post (block C in the attached chart).
Thank you in advance for any answers

Network

Cited By

Projects

Projects (4)
Archived project
Interaction of MRFs and RC shear walls in RC dual systems, To get an insight into the behaviour of RC shear walls in nonlinear status
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
Reducing the complexity of the final solution, the robustness of the optimal design, removing the hair-like elements in the final optimized structures