Verification of multi-degree-of-freedom building modelling for seismic response prediction based on microtremor measurement
Verification of multi-degree-of-freedom building modelling for seismic response prediction based on microtremor measurement
复制标题
基于微震测量的地震反应预测多自由度建筑模型验证
DOI：
10.1002/eqe.3630
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发表时间：
2022
影响因子：
4.5
通讯作者：
Jinzhe XIE
中科院分区：
文献类型：
--
作者：
Yoshiki IKEDA;Masahiro KURATA;Jinzhe XIE
采用四层钢试件的振动台试验研究了所提出的建筑物动力响应模型的适用性。该方法基于微动测量结果推导出多自由度线性建筑物的运动方程。在线性假设下，该方程可以估计微动传感器位置处的地震响应加速度、速度和位移，而不需要质量、阻尼、刚度矩阵的相关信息，也不需要结构设计文档来估计与结构和非结构部件的地震损伤相关的峰值响应。建模不受结构形状、框架组成、结构构件连接或刚性楼板假设的约束。与以往的方法相比，该模型适用于具有标准/典型刚性楼板的简单/规则建筑形状，也适用于具有不规则形状、平坦空间和开放空间（如大中庭和天窗）的大型低层建筑。适用性研究考虑了两种实际情况：自然频率和阻尼比的基础上，可以通过地震和结构设计的标准假设更新的脉动。当地震输入的参与向量是从位于上部楼层的传感器获得时，预测精度是最好的;结构主要表现出弹性响应;模态系统识别应用于地震测量;并且局部损伤不影响结构的全局地震响应。其原因在于，该方法假设识别的振型不会因地震的发生而改变。
The applicability of the proposed dynamic response model for buildings is investigated using shaking‐table tests with a four‐storey steel specimen. This approach derives the equation of motion for a multi‐degree‐of‐freedom linear building based on microtremor measurements. Under a linear assumption, the equation can estimate the seismic response accelerations, velocities, and displacements at microtremor sensor locations without the need for information about the mass, damping, stiffness matrices or need for structural design documents to estimate peak responses that are linked with seismic damages of structural and non‐structural components. The modelling is unconstrained by structural shape, composition of frames, connections of structural members, or the assumption of a rigid floor. In comparison to the previous methods assuming simple/regular building shape with standard/typical rigid floor, the proposed model is applicable to large‐scale low‐rise buildings with irregular shapes, flat expanses, and open spaces such as large atria and skylights as well. The applicability study considers two practical scenarios: natural frequencies and damping ratios based on microtremors that can be updated by an earthquake and a standard assumption for structural design. The prediction accuracy is best when the participation vector for seismic input is obtained from sensors located on the upper floors; the structure mostly exhibits elastic response; a modal system identification is applied to the seismic measurement; and local damage does not affect the global seismic response of the structure. The reason is that this method assumes that identified mode shapes do not change due to the occurrence of an earthquake.