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在设计中按照“强节点、弱构件”的原则进行结构设计,地震作用下,节点区域的变形很小,因此在结构分析中节点通常假定为刚性。随着结构龄期变化,结构将产生耐久性损伤,节点区域变形增大,此时要通过节点区域的直接建模来考虑其变形对结构抗震性能的影响。以典型6层混凝土框架为例,用两种不同节点建模方法建立整体结构模型,对不同龄期的结构进行易损性分析,建立了结构的时变易损性模型。研究表明,考虑节点区域变形的结构失效概率偏大,其偏差幅度和速率随着龄期和峰值加速度的增大而增大。
In the design, the structural design is based on the principle of “strong nodes and weak components”. Under earthquake, the deformation of the node area is very small, so the nodes are usually assumed to be rigid in structural analysis. With the change of structure age, the structure will produce the durability damage and the deformation of the node area will increase. At this moment, the influence of the deformation on the seismic performance of the structure should be considered through the direct modeling of the node area. Taking a typical 6-story concrete frame as an example, two different node modeling methods were used to establish the overall structural model, and vulnerability analysis of structures at different ages was carried out. A time-varying vulnerability model of the structure was established. The results show that the structural failure probability considering the deformation of the node area is large, and the amplitude and rate of the deviation increase with the increase of the age and the peak acceleration.