地震动非平稳特性对结构响应影响的定量关系模型及其建模方法研究

The effects of the non-stationarity of earthquake ground motion on the structural responses is vital, but the quantitative relationships between them is hard to be estabilished. Because the parameters and their values describing the non-statioanrity of earthquake ground motion are large, and there exsits interaction effect among parameters, the calculation amount will be very large if we consider the whole combination of parameters simutaneously.Therefore,it is desirable to find ways to solve the problem.Early research has shown that the design of experiment method can be applied to realize the design space exploration of complex system and deal with the the issue of multiple parameters and values.This study intends to establish a DOE scheme that is suitable for analyzing the multiple parameters and values of earthquake ground motion characters based on the analysis of the parameters and values of non-statioanrity of earthquake ground motion. Then, an optimized scheme that illustrates the most disbennifiting influences of structural responses will be deduced through optimizing the character parameters of the earthquake ground motion for multiple times based developed DOE scheme. Finally, combinating with approximative technique, a proximate quantitative relationship model between earthquake ground motion parameters and structural responses will be estiblished, which can provide reliable theory basis in simulating or selecting earthquake acceleration time history considering structure property.

地震动非平稳特性对结构响应有重要影响，但已有的研究尚未给出它们之间的定量关系，因此无法将地震动特性研究成果广泛应用于工程实践。由于对地震动非平稳特性的描述参数及取值较多，且不同参数和取值之间存在交互作用，如果对所有参数和取值进行全面组合，计算量将非常大，因此需要找到合适的方法来解决此问题。前期研究表明，试验设计（DOE）方法能够实现对复杂系统的设计空间探索,处理多参数及多取值的问题。本项目拟在统计分析地震动非平稳特性参数和取值范围的基础上，提出适合于地震动非平稳特性研究的DOE算法；并基于该算法，对地震动非平稳特性参数进行多次优化，获得对结构响应有不利影响的参数组合方案；最后通过与近似技术相结合，建立地震动非平稳特性参数与结构响应之间的近似定量关系模型，为工程实践中能够基于结构特性合理设置地震动特性参数、以及合成/挑选地震加速度时程提供可靠的理论依据。

为了定量分析地震动非平稳特性对结构响应的影响，本研究首先将实验设计(DOE)方法引入地震工程研究领域，建立了适合于分析地震动强度与频率非平稳特性参数的DOE算法，结果表明，该算法能够合理解决地震动非平稳特性分析中多参数、多取值及其之间的高阶交互效应问题，能够高效提取数据并分析结果，节约计算分析成本；其次对地震动非平稳特性参数进行多次优化设计，建立了合理的目标参数，获得对结构响应有不利影响的参数组合方案；最后通过与近似技术相结合，建立了地震动非平稳特性参数与结构弹性/弹塑性响应之间的近似定量关系模型，为工程实践中能够基于结构特性合理设置地震动特性参数、以及合成/挑选地震加速度时程提供可靠的理论依据。