近断层速度脉冲地震作用下位移反应谱的研究

Research on displacement response spectra under effect of velocity pulse earthquake at near-fault ground

以424条速度脉冲记录作为统计样本,得到了弹性位移谱和等延性位移谱,并建立了与阻尼比、场地类别相对应的弹性位移谱的计算公式,分别计算了考虑及未考虑P—Δ效应影响的等延性位移谱,并进行对比分析,然后得到了等延性位移谱考虑P—Δ效应的修正公式,研究结果对近断层速度脉冲地震作用下结构的抗震设计具有很好的应用价值。

Taking 424 pieces of the records of the velocity pulse as the statistical sample, the paper concludes the elastic displacement spectra and the constant-ductility displacement spectra, establishes the calculation formula of the elastic displacement spectra which is consistent with the damping ratio and the field classification, calculates the constant-ductility displacement spectra influenced by P-△ effect which is considered and neglected, undertakes the comparison and the analysis, concludes the modification formula for the estimation of P--A effect of the constant- ductility spectra, and results of the research show that the research has better application value for the anti-seismic design of the structure under the effect of the velocity pulse earthquake at near-fault ground.