Elasto-plastic response spectra for seismic design of beam bridge under near-field ground motions
Li Yu1,2 Fu Yao1,2 Li Chen1,2
1. Key Laboratory of Bridge Detection Reinforcement Technology of the Ministry of Communications, PRC, Chang′an Universiry, Xi′an 710064, China
2. Chang′an University, Xi′an 710064, China
Abstract：Based on the definitions of near-field ground motion in domestic and international codes, 215 near-field ground motion records are collected. Effects of those factors, including ground motion characteristics (earthquake magnitude, soil properties in site and PGA) and dynamic parameters of restoring force model (different restoring force model type, post-yield stiffness ratio, damping ratio and displacement ductility coefficient) on near-field elasto-plastic response spectra are investigated based on thestudy on near-field elasto-plastic response spectra (including acceleration response spectra, displacement response spectra, residual displacement response spectra and strength reduction factor response spectra). By comparing near-field elasto-plastic response spectra with far-field elasto-plastic response spectra, some results are obtained as follows: 1) the descending part of near-field elasto-plastic acceleration response spectra in sites of type I~III is relatively mild, but the sensitive area of elasto-plastic acceleration response spectra in site of type Ⅳ is wider| 2) the values of near-field elasto-plastic displacement response spectra in sites of typeⅠ~Ⅲ are larger than those in site of type Ⅳ. Furthermore, near-field elasto-plastic response spectra correspondings to the site specified in Chinese codes for seismic design of bridge engineering are established. The established near-field elasto-plastic response spectra can be applied to near-field seismic design of bridge and can provide the near-field demand spectra for further studying the capacity spectrum method.
李宇 付曜 李琛. 梁式桥抗震设计的近场地震弹塑性反应谱[J]. 土木工程学报, 2017, 50(7): 78-86.
Li Yu Fu Yao Li Chen. Elasto-plastic response spectra for seismic design of beam bridge under near-field ground motions. 土木工程学报, 2017, 50(7): 78-86.
