【摘要】 在地下结构的动力分析中,通常将结构周围土体的约束简化为作用在结构上的弹簧和阻尼器,针对剪切型地下结构和一般多自由度地下结构分别提出了识别结构参数和周围土体附加参数的方法。通过建立系统的时域运动方程,剪切型模型结构的参数和其周围土体的附加参数可被同时识别;而对于一般的多节点有限元模型结构,则采用两阶段法识别。首先通过建立不含附加参数的运动方程来识别结构参数,然后把识别得到的结构参数代入到包含附加参数的运动方程来识别附加参数,最后通过数值算例说明了所提出的识别算法的可行性。更多还原

【Abstract】 In the dynamic analysis of underground structure,the constraint to structures caused by the surrounding soil is often simulated by the virtual parameters,such as virtual mass,stiffness and damping parameters.Because of these virtual parameters,the model of underground structure is different from that of ground structure,which will cause traditional methods to fail in solving underground structure.Therefore,two approaches are presented— one method is applied to shear-type underground structure which can identify the structural parameters and virtual parameters at one step;and the other method which can be used to estimate common system with multi-degree freedoms by two step.In the first step,the structural parameters are identified;and in the second step,the virtual parameters can be estimated by using the structural parameters identified before.At last,a numerical example of shear-type building is applied;the results show the feasibility and efficiency of the method.更多还原