地震动强度非平稳特性参数与结构响应之间的近似定量关系分析

本文在对实际地震加速度记录统计分析的基础上，给出了能够合理描述地震动强度非平稳特性的参数及其取值范围；然后引入实验设计方法，建立了适合于地震动强度非平稳特性参数分析的实验设计算法，用来分析地震动强度非平稳特性参数的变化对结构响应的影响；最后通过与近似技术相结合，建立了地震动强度非平稳特性参数与结构响应之间的近似定量关系模型.结果表明，本文提出的实验设计方法适合于对地震动强度非平稳特性参数进行分析，该方法在有效地减小计算量的同时，获得了结构响应与参数变化之间的对应关系.基于实验设计方法进行的特性参数方差分析结果表明:地震动的稳态持时对结构地震响应的影响比较显著；对于周期较小的结构，特性参数之间的交互作用对结构地震响应的影响显著，但当周期大于1 s时，则不显著.本文建立的近似定量关系模型能够较好地反映不同特性参数、不同周期结构动力响应之间的联系，为工程实践中基于结构特性合理设置地震动特性参数、合成或挑选地震加速度时程提供理论依据. 

Approximate quantitative relationship between earthquake ground motion and structural responses

On the basis of the statistical analysis of the actual seismic acceleration records, this paper gives the parameters describing the non-stationary of earthquake ground motion and their value ranges. And the design of experiments (DOE) method is introduced to establish suitable algorithm to analyze the influence of the change in the non-stationary characteristic parameter of ground motion on the structure responses. Furthermore, an approximate quantitative relationship between the non-stationary characteristic parameters of the earthquake ground motion and the structural responses is established by combining with approximate technology. The results show that: ① The DOE method presented in this paper is suitable for the analyses of non-stationary characteristic parameters of ground motion intensity, and satisfied results can be obtained based on the less amount of calculation. ② Variance analysis of characteristic parameters based on DOE method shows that the steady-state duration of ground motion has significant influence on the seismic response of the structure; for structures with shorter period, the interaction between characteristic parame-ters has a significant impact on seismic response of structures, but when the period is greater than 1 s, its influence gradually decreases. ③ The approximate quantitative relationship established in this paper can better reflect the relationship between different characteristic parameters and different structural dynamic response, providing the theory basis for engineering practice to setting up reasonable seismic characteristic parameters based on the structural characteristics and synthetize or select earthquake acceleration time history.