【摘要】 在总结增量动力分析中地震动强度参数的基本性质、研究现状和存在问题的基础上,针对不可忽略高阶振型影响的高层结构增量动力分析,在结构基本周期对应弹性加速度谱值Sa(T1,ξ)和Cordova提出的双参数地震动强度参数S*基础上,提出幂函数乘积形式的地震动强度参数S12和S123,它们是以结构主要周期点对应的弹性加速度反应谱值为底数、以各周期点的振型参与质量系数比为指数的各振型结果的乘积。以某复杂高层结构为例,对比采用本文提出的地震动强度参数与已有地震动强度参数进行增量动力分析的有效性。研究结果表明,对于高层结构,采用地震动强度参数Sa(T1,ξ)比采用PGA进行增量动力分析更具有效性;采用PGV作为地震动强度参数进行增量动力分析的有效性优于考虑单一谱值的参数Sa(T1,ξ)和考虑前两阶谱值的参数S*和S12,但较考虑前三阶谱值参数的S123差;本文提出地震动强度参数,考虑阶数越多更显其有效性;从工程应用角度出发,建议高层结构采用S123作为地震动强度参数进行增量动力分析。更多还原

【Abstract】 In this paper,typical characteristics,state of the art and existing problems of intensity measure(IM) parameters are firstly summarized.To consider the contribution of higher modes for the incremental dynamic analysis(IDA) of high-rise structures,an IM parameter in terms of the multiply of power-law functions was proposed,in which response spectra at major periods are the bottom number and corresponding modal mass participation proportions are the exponent.Then IDA of a high-rise SRC frame-RC tube structure was employed to investigate the efficiency of the proposed IM S12 and S123,in which the first two and three modes are considered,respectively.Comparison with PGA,PGV,Sa(T1,ξ),S* proposed by Cordova was made as well.The results show that Sa(T1,ξ) is more efficient than PGA even for high-rise structures.PGV is proven to be efficient relative to the single spectral value Sa(T1,ξ) and measures S* and S12 presented by two spectral values,but deficient relative to the S123 presented by three spectral values.It is found that the more modes are considered,the more efficient the IM is.From the view of engineering application,S123 is recommended for the IDA of high-rise structures.更多还原