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RISS 인기검색어
- 검색키워드
- 저자 : Khoshkalam, Mohammadreza (검색결과 2 건)
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Effect of Outrigger Panels on Seismic Performance of Steel Plate Shear Wall Structural System
Akbar Vasseghi,Vahid Khoshkalam 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
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 stiff ness of the SPSW structural system in tall and slender buildings may result in excessive lateral drift and high seismic demands on vertical boundary elements (VBE). Placement of additional SPSW panels in the structure acting as outriggers could signifi cantly reduce the lateral drifts and seismic demand on the VBEs by redistributing some of the overturning forces to adjacent columns. In this paper, a 40-story building is evaluated using steel plate shear wall structural system with and without outriggers. The outrigger panels are placed in 20th, 30th, and 40th story levels and the eff ectiveness of these elements on the overall seismic behavior is studied. Seven nonlinear time history analyses are carried out and the seismic performance of the structural system with outriggers is compared to the performance of the system without outriggers. The results indicate a signifi cant reduction in lateral drifts and VBE seismic demands when the system is augmented with steel plate outrigger panels.
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Seismic Fragility Estimates of LRB Base Isolated Frames Using Performance-Based Design
Mansouri, Iman,Ghodrati Amiri, Gholamreza,Hu, Jong-Wan,Khoshkalam, Mohammadreza,Soori, Sanaz,Shahbazi, Shahrokh John Wiley Sons, Inc 2017 Shock and vibration Vol.2017 No.-
<P>With improving technology, the idea of using energy dissipater equipment has been strengthened in order to control the structures response in dynamic loads such as wind and earthquake. In this research, we dealt with seismic performance of base isolated structures with lead-rubber bearing (LRB) using incremental dynamic analysis (IDA). For this purpose, 3- and 9- story buildings have been utilized in the SAC project undergoing 22 earthquake records which were far-fault. Plotting the fragility curve for various states of design time period and isolator damping of LRB, it is observed that, by increasing damping, the isolator has not been activated in small spectrum acceleration, which shows that the annual exceedance probability is increased in immediate occupancy (IO) performance level and decreased in life safety (LS) performance level. The results show the reduction of determined failure probability in fragility curves for two levels of performance of uninterrupted use and lateral safety. Likewise obtained results show that, with increasing design time period of isolator, the amount of failure probability is decreased rather than the isolator with smaller design time period, for both LS and IO states. And the isolator illustrates better performance.</P>
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