结构残余位移是抗震性能评估和地震损失评估的重要参数。以往针对结构残余位移的研究主要基于刚性地基假定,而地震作用下基于刚性地基假定和考虑土-结构相互作用效应得到的结构响应存在差异。鉴于此,建立了考虑土-单自由度体系相互作用效应的模型,基于大量分类地震动记录,通过时程分析分别建立基于刚性地基假定和考虑土-结构相互作用(soil-structure interaction,SSI)效应的结构残余位移比谱,研究场地类别、屈服强度系数和高宽比对结构残余位移比谱及其离散性的影响,建立了考虑SSI效应的结构残余位移比谱预测方程。结果表明:存在临界周期点,当周期小于临界值时考虑SSI效应的结构残余位移比谱值小于基于刚性地基假定的结构残余位移比谱值,且SSI效应程度越大结构残余位移比谱越小;当周期大于临界值时,考虑SSI效应和基于刚性地基的结构残余位移比谱差距很小;AB类、C类、D类和E类场地的临界周期分别为0.5 s,0.5 s,0.8 s和1.2 s;基于刚性地基假定的结构残余位移计算结果偏于保守。
关键词:土-结构相互作用;场地类别;残余位移;屈服强度系数;高宽比
Abstract
Residual displacement is an important parameter for seismic performance evaluation and seismic loss assessment. Existing methods used in the evaluation of residual displacement demand has been primarily focused on fixed-base systems. Structural performance during earthquake excitations is different between the soil-structure interaction (SSI) system and the fixed-base case. In the light of this, a structural model considering the interaction between soil and single degree of freedom (SDOF) system was established. Based on a large number of classified ground motions, the residual displacement ratios spectra (Cr) for the SSI systems and the fixed-base cases were constructed by means of nonlinear response time-history analyses. The results were statistically organized to evaluate the influence of the following parameters: site condition, the normalized strength demand and aspect ratio. A simplified formula was proposed to estimate mean Cr of the SSI systems. These results show that there is a critical period point to judge whether there is a gap between the Cr of the fixed-base system and SSI system. When the period is less than the critical value, the value of Cr of the SSI system is smaller than that of the fixed-base case. Within this period region, the deeper the SSI effect is, the smaller the value of Cr is. When the period is greater than the critical value, the difference between the value of Cr of the SSI system and that of the fixed-base is very small. The critical periods of sites of class AB, C, D and E are 0.5 s, 0.5 s, 0.8 s and 1.2 s, respectively. The values of residual displacement corresponding to the fixed-base systems tend to be conservative.
Key words: soil-structure interaction; soil category; residual displacement; normalized strength demand; aspect ratio
关键词
土-结构相互作用 /
场地类别 /
残余位移 /
屈服强度系数 /
高宽比
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Key words
soil-structure interaction /
soil category /
residual displacement /
normalized strength demand /
aspect ratio
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