The performance-based seismic response of special steel MRF: Effects of pulse-like ground motion and foundation safety factor. (December 2020)

• Record Type: Journal Article
• Authors: Mashhadi, Sima; Asadi, Azita; Homaei, Farshad; Tajammolian, Hamed
• Is Part Of: Structures. Volume 28(2021)
• Page Start: 127
• Page End: 140
• Publication Date: 2020-12
• Subjects: BNWF the Beam on Nonlinear Winkler Foundation -- CP Collapse Prevention -- EDP Engineering Demand Parameter -- FF Far-Fault -- FSV Foundation Vertical Safety Factor -- HF High-Frequency -- IDA Incremental Dynamic Analysis -- IDR Inter-Story Drift Ratio -- IM Intensity Measure -- IO Immediate Occupancy -- LS Life Safety -- MRF Moment-Resisting Frame -- OpenSees Open system of earthquake engineering simulation -- Orig. Original -- PBSR the Performance-Based Seismic Response -- Pul. Pulse -- Res. Residual -- SDOF Single-Degree-of-Freedom -- SSI Soil-Structure Interaction; Foundation safety factor -- Soil-structure interaction -- Incremental dynamic analysis -- Near-fault earthquake -- Far-fault earthquake; Structural engineering -- Periodicals; 624.1
• DOI: 10.1016/j.istruc.2020.08.040
• Languages: English
• ISSNs: 2352-0124

Abstract

Abstract: This study aims to investigate the effect of near-fault pulse-like earthquake ground motions as well as the foundation safety factor, on the performance-based seismic response (PBSR) of special steel moment-resisting frame (MRF). The Beam on the Nonlinear Winkler Foundation (BNWF) approach was employed for modeling the soil-foundation system. In this regard, values of 2, 3, and 5 were considered for the foundation vertical safety factor ( FSv ). The PBSR of the MRF has been assessed under 32 far-fault (FF) ground motions as well as 55 near-fault (NF) pulse-like records, through Incremental Dynamic Analyses (IDAs). The effects of extracted pulses and residual components of near-fault records were investigated as well. Results show that regardless of the earthquake record type, FSv has no considerable effect on the performance-based drift demand in the structure. However, larger settlement and rotation of the foundation are expected when a small FSv is accounted for. This leads to difficulties in providing the Immediate Occupancy ( IO ) performance objective for structures with operational performance levels. The effect of the input record type on the median foundation settlement is also inconsiderable. As well, a similarity was observed between the seismic performance of the structure under the residual components and the far-fault records. What's more, neither the extracted pulses nor the residual components of near-fault earthquake records can represent the original near-fault pulse-like records. Also, the residual component plays an important role in the structural responses under low-intensity earthquake events.