预制装配式混凝土结构停车楼弹塑性地震反应分析与评价

Elastoplastic Analysis and Assessment of a New Precast Concrete Parking Structure Under Earthquake Excitation

装配式结构与现浇结构有限元模型的最大区别在于节点处理方法,现浇结构的节点通常采用刚接,而装配式结构的节点往往只是耦合某一个或多个自由度,因此确保建立的有限元模型能够准确反应装配式结构的动力特性非常重要。针对某装配式结构采用ABAQUS软件建模,文中介绍了节点的建模方法,同时采用ANSYS软件对ABAQUS模型进行了校核。最后对该模型进行了弹塑性地震反应分析,验算了底部剪力、层间位移及节点强度。通过对地震反应的结果进行分析可知:多遇地震及罕遇地震作用下,结构最大层间位移角小于规范限值;多遇地震作用下,节点基本处于弹性状态,罕遇地震作用下,部分梁端节点、墙角节点屈服。

The largest difference between precast and cast structures is the joint simplification method. Generally the joints of cast structures are rigid, while the joints of precast structures only couple one or more degrees of freedom. Therefore it＇ s very important to ensure that the finite element model （FEM） can accurately reflect the dynamic properties of precast structure. In this paper, ABAQUS is used to build the FEM, and also the joint simplification method is introduced. Meanwhile ANSYS is adopted to validate the FEM of ABAQUS. At last, the elastoplastic seismic response is calculated to check the base shear, story drift and joint strength. Through the seismic analysis, we can know that： the largest story drifts are smaller than the specified limited values under frequently and rarely occurred earthquakes; the joints are in elastic stage under frequently occurred earthquake and a portion of the beam-end and corner joints are yielding under rare occurred earthquake.