Evaluation of the effects of higher modes in steel flexural frames under near earthquakes parallel to and perpendicular to faults

Document Type : Original Article

Authors

1 Associate Professor, Faculty of Civil Engineering, Semnan University

2 Master of Civil Engineering, Earthquake Approach, Semnan University

3 Assistant Professor of Civil Engineering, Khuzestan University Jihad, Ahwaz

Abstract

Evaluation of structures for near-fault earthquakes is taken into consideration of different researchers in recent years. Near-fault earthquakes with forward-directivity effect cause a pulse in the velocity record. The long-period velocity pulse in near-fault earthquakes causes higher seismic demands in steel moment resisting frames than far-fault earthquakes. In this research higher modes effect (HME) are evaluated in steel moment resisting frames under strike-normal (SN) and strike-parallel (SP) of near-fault earthquakes with forwarddirectivity effect and velocity pulse. For this purpose, Displacement-based adaptive pushover (DAP) method that considers the higher modes effect, has been used in this paper. The results show that the higher modes effect under strike-parallel component is higher than strike-normal component. Top stories of the structures are affected by higher modes effects. The results show that HME is increased by enhancing the time period of the structures.

Keywords

Asas Journal
Volume 19, Issue 46
June 2017
Pages 31-50

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History

  • Receive Date: 24 July 2018
  • Accept Date: 24 July 2018

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