节点刚度对预制装配框架抗震性能的影响分析

采用端部带转动弹簧的梁单元力学模型,编制相应的Fortran语言刚架计算程序,对不同节点刚度的钢筋混凝土预制装配框架结构的自振周期等动力特性进行了系统研究,并分析了不同节点刚度的钢筋混凝土预制装配框架在8度(0.20g)多遇地震作用下的层间位移和层间位移角。结果表明:混凝土预制装配框架结构的自振周期随着节点刚度的减小而不断增大,节点刚度对低阶振型自振周期影响较大、对高阶振型自振周期影响较小;层间位移和层间位移角随着节点刚度的增大而不断减小,在节点刚度较小时不满足多遇地震作用下的钢筋混凝土框架弹性位移角限值要求。

Effect of Joint Stiffness on Seismic Properties of Precast Concrete Frames

In this paper, a mechanics model for the hybrid beam element with end sprigs is presented. With this model, the dynamic properties eg. vibration period of precast concrete frames with different joint stiffness were re- searched, and then story displacement and story drift angle of precast concrete frames that considering joint stiffncss were analyzed under 8 degree （0.20g） seismic using relative frame calculation procedure by Fortran language. The results showed that：period of vibration of precast concrete frames increased as the joint stiffness decreasing ,joint stiff- ness affect period of vibration of lower modes greater than higher modes. Story displacement and story drift angle de- creased with the joint stiffness increasing, hinge joints or little joint stiffness did not meet the limit value of the elastic displacement angle of RC frame.