Akbar Vasseghi

Akbar Vasseghi
International Institute of Earthquake Engineering and Seismology | iiees · Structural Engineering

PhD

About

20
Publications
11,001
Reads
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85
Citations
Citations since 2016
8 Research Items
66 Citations
20162017201820192020202120220510152025
20162017201820192020202120220510152025
20162017201820192020202120220510152025
20162017201820192020202120220510152025
Additional affiliations
March 2000 - present
International Institute of Earthquake Engineering and Seismology
Position
  • Professor (Associate)
March 2000 - present
International Institute of Earthquake Engineering and Seismology
Position
  • Professor (Associate)

Publications

Publications (20)
Article
Full-text available
The geometry of skewed and curved bridges can cause complexity of their dynamic response and difficulty of analysis against earthquakes. In addition, when vibration occurs in the curved bridges, due to their specific geometry, the vertical, flexural, and torsional vibrations of the deck are coupled. The present study was carried out aiming to inves...
Article
This paper presents the results of failure analysis of a 16-in. natural gas pipeline that ruptured due to ground movement caused by a 40 m wide landslide. The rupture occurred at a girth weld in the middle of a double bend located 120 m from the center of the landslide. The Finite Element Analysis (FEA) method was used to evaluate the response of t...
Article
This paper presents a simple and efficient analytical model for nonlinear response analysis of steel plate shear wall (SPSW) structural systems. The proposed model combines individual contributions of the boundary frame and the infill plate. It includes a nonlinear spring element that simulates the global response of the infill plate. The load‐defo...
Article
Full-text available
Among highway bridges, curved ones are very common at urban intersections and, generally, in limited urban spaces. However, such bridges are often involved in multiple vibrational behaviors, making them more sensitive to vertical components of ground motion due to their irregular geometry. The primary objective of this study has been to develop a t...
Article
Structural systems with steel plate shear wall (SPSW) have been used in many tall buildings in the past decades. This system is particularly suitable for seismic regions because it can dissipate the seismic energy through the inelastic response of steel plate in shear. However, the relatively low lateral stiffness of the SPSW structural system in t...
Conference Paper
Precast concrete frame structures are in many respects such as quality, amount of site work and construction speed superior to the cast-in-place concrete structures. However, seismic performance of these structures is significantly affected by the behavior of beam-column connections.A typical type of precast connections are the ones in which the co...
Article
In this paper, fragility functions are developed for natural gas transmission pipelines at anchor block interface under the effect of seismic wave propagation. The fragility functions are developed for three typical pipelines in two types of soils. Seismic response of the pipeline at anchor block interface is evaluated by conducting non-linear dyna...
Article
In recent years, particularly after the occurrence of strong earthquakes, there is an increased need for seismic retrofit of present bridges and changes in the design of new bridges. A method for retrofitting concrete bents in bridges involves the use of steel sheets or profiles to apply the confinement force. In this study, two specimens were anal...
Article
This paper presents the results of an experimental study which was carried out to identify the vulnerabilities of existing multicolumn bridge bents constructed in Iran and to develop an appropriate retrofit measure to alleviate such vulnerabilities. In this study a three column reinforced concrete bridge bent, which was designed for gravity load wi...
Chapter
Time history analysis is a broadly accepted versatile approach, for real seismic analyses. In the most general case, time history analysis is based, on time integration, for which, the computational cost might be intolerable. For reducing the computational cost, a technique is recently proposed, based on replacing the digitized excitations, with ex...
Article
This paper presents the results of an analytical study on inelastic behavior of a four-span continuous composite bridge girder. The objective is to evaluate the effect of pier section reinforcement on strength and ductility of the girder. The reinforcement consists of two pairs of longitudinal ribs bolted to the web of steel sections adjacent to in...
Article
This paper presents an economical solution to improve the seismic response of simply supported precast concrete girder bridges under transverse excitation. This solution employs an energy dissipation system, which consists of conventional elastomeric bearings that transfer gravity load to the substructure, and energy dissipating shear keys that rep...
Article
Full-text available
This paper presents the results of seismic vulnerability analysis of the historic sultaniyeh dome constructed for the tomb of Uljaytu. This monumental building was constructed about 700 years ago and is now recognized as one of the largest masonry structures in the world. Finite element analysis is used to assess the seismic resistance of the build...
Article
The ultimate load carrying capacity of continuous composite plate girder bridges is usually limited by the local buckling failure of steel girders at interior supports. This paper presents a simple reinforcement method which changes the failure mechanism of the continuous girder from local buckling to formation of plastic hinges at the interior sup...
Article
Highway bridges are frequently constructed as simple span structures with steel or concrete girders and a cast-in-place concrete deck, spanning from one pier to another. At each end of the simple span deck, a joint is provided for deck movement due to temperature, shrinkage, and creep. Bridge deck joints are expensive and pose many problems with re...
Conference Paper
Full-text available
مطالعه اثر زلزله های نیرومند سالهای گذشته نشان دادند نگاشتهای نزدیک گسل دارای مدت زمان موثر کمتری نسبت به نگاشتهای دور از گسل هستند و در نگاشتهای سرعت نزدیک گسل ، یک یا چند پالس ضربه ای با دامنه بزرگ و دوره تناوب زیاد وجود دارد که باعث افزایش نیاز شکل پذیری برای سازه های صلب در زلزله های نزدیک گسل می شود. همچنین افزایش نسبت پریود پالس حرکت زمین به...
Article
The web of plate girders in bridges are usually reinforced by welded transverse stiffeners in order to improve their shear capacity. Due to problems associated with field welding and fatigue, welded stiffeners are not suitable for retrofitting existing bridges. Bolted stiffeners are a practical alternative for strengthening girders that are expecte...
Article
Full-text available
This paper presents the results of an analytical study conducted to evaluate the performance of short and medium span bridges using an innovative energy dissipation system aimed at improving seismic response of bridges. The energy dissipation system consists of ordinary rubber bearings which transfer the gravity load to the substructure and energy...
Article
Full-text available
This paper presents the results of seismic vulnerability analysis of the historic sultaniya dome constructed for the tomb of Uljaytu. This monumental building is 47 meter high brick masonry structure with a dome type roof. The roof is a two layer shell structure with a base diameter of 25.5 meters. The building was constructed about 700 years ago a...

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