结构动力反应分析中的地震动输入问题研究
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摘要
目的为解决重要工程结构在地震动力反应分析时合理选取地震动输入的问题.方法针对不同的工程结构,选择结构的特征周期作为结构特征参数,对不同的地震环境下结构抗震分析中的地震动时程通过理论分析和实际震害经验相结合的技术途径,采用地震危险性分析方法,确定出对场址贡献量最大的潜在震源区、地震震级,并由衰减关系求得震中距,实现具有理论依据的设定地震动确定过程.结果提出地震动时程的选取过程是一个设定地震的确定过程的概念,并将其定义为与结构特性相关的设定地震.笔者建议的与结构特性相关设定地震方法更能体现对结构地震反应贡献较大的前q阶振型的自振周期的主要影响,全面展现不同工程结构在所面对的不同危险水平潜在地震威胁情况下的反应特点,提高结构的安全性.结论相同的结构在不同的地震环境下设定地震是不同的;而在相同的环境下,不同结构的设定地震也是不同的.在确定结构不同地震危险水平下地震动影响时,应该根据具体的结构特点和地震环境确定合理的设定地震.
The estimation of ground motion input is one of the main problems in structural dynamic response analysis.To solve this problem,this paper puts forward one improved estimating method for different engineering structures by taking the structural feature period as the typical parameter based on theoretical analysis,practical experience,and then design earthquake could be estimated by main affecting potential seismic areas according to seismic hazard analysis and attenuation relation.The suggested process could embody structural typical dynamic characters in case of suffering different seismic excitations,which will be very helpful to examine structural safety during earthquakes.The same structure might face different design earthquakes under different seismic environments,and also different structures might have different design earthquakes although with the same seismic environment.So the design earthquakes should be chosen reasonably by taking into account both of structural characters and seismic environment.
引文
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