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Design spectra including effect of rupture directivity in near-fault region
作者姓名:徐龙军  谢礼立
作者单位:[1]College of Engineering, Ocean University of China, Qingdao 266100, China [2]School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China [3]Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA
基金项目:国家自然科学基金;黑龙江省教育厅科学技术研究项目
摘    要:In order to propose a seismic design spectrum that includes the effect of rupture directivity in the near-fault region, this study investigates the application of equivalent pulses to the parameter attenuation relationships developed for near-fault, forward-directivity motions. Near-fault ground motions are represented by equivalent pulses with different waveforms defined by a small number of parameters (peak acceleration, A, and velocity V; and pulse period, Tv). Dimensionless ratios between these parameters (e.g., ATv/V, VTv/D) and response spectral shapes and amplitudes are examined for different pulses to gain insight on their dependence on basic pulse waveforms. Ratios of ATv/V, VTv/D, and the ratio of pulse period to the period for peak spectral velocity (Tv-p) are utilized to quantify the difference between rock and soil sites for near-fault forward-directivity ground motions. The ATv/Vratio of recorded near-fault motions is substantially larger for rock sites than that for soil sites, while Tvp/Tv ratios are smaller at rock sites than at soil sites. Furthermore, using simple pulses and available predictive relationships for the pulse parameters, a preliminary model for the design acceleration response spectra for the near-fault region that includes the dependence on magnitude, rupture distance, and local site conditions are developed.

关 键 词:近断层区  地面运动  断裂方向性效应  地震设计谱  衰减
文章编号:1671-3664(2006)02-0159-12
收稿时间:2006-06-19
修稿时间:2006-09-12

Design spectra including effect of rupture directivity in near-fault region
Longjun Xu,Adrian Rodriguez-Marek,Lili Xie.Design spectra including effect of rupture directivity in near-fault region[J].Earthquake Engineering and Engineering Vibration,2006,5(2):159-170.
Authors:Longjun Xu  Adrian Rodriguez-Marek  Lili Xie
Institution:1. College of Engineering, Ocean University of China, Qingdao 266100, China;School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
2. Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA
3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
Abstract:In order to propose a seismic design spectrum that includes the effect of rupture directivity in the near-fault region, this study investigates the application of equivalent pulses to the parameter attenuation relationships developed for near-fault, forward-directivity motions. Near-fault ground motions are represented by equivalent pulses with different waveforms defined by a small number of parameters (peak acceleration, A, and velocity V; and pulse period, Tv). Dimensionless ratios between these parameters (e.g., ATv /V, VTv /D) and response spectral shapes and amplitudes are examined for different pulses to gain insight on their dependence on basic pulse waveforms. Ratios of ATv /V, VTv /D, and the ratio of pulse period to the period for peak spectral velocity (Tv-p) are utilized to quantify the difference between rock and soil sites for near-fault forward-directivity ground motions. The ATv /V ratio of recorded near-fault motions is substantially larger for rock sites than that for soil sites, while Tv-p /Tv ratios are smaller at rock sites than at soil sites. Furthermore, using simple pulses and available predictive relationships for the pulse parameters, a preliminary model for the design acceleration response spectra for the near-fault region that includes the dependence on magnitude, rupture distance, and local site conditions are developed.
Keywords:near-fault ground motion  pulse  attenuation relation  velocity pulse period  design spectrum
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