柔性节点预制混凝土结构的动力反应

采用端部带转动弹簧的梁单元力学模型,对柔性节点预制混凝土框架结构的动力学特性及其在地震作用下的动力反应规律进行了系统研究.结果表明:结构自振频率随着节点相对刚度比的增加不断增大,当节点相对刚度比在0.1～10之间变化时,结构自振频率的变化十分明显.结构峰值位移反应随着节点相对刚度比的增加呈总体下降趋势,但下降趋势和程度受输入地震波能量分布特征的影响,并可能局部增大.随着节点相对刚度比的增加,结构在地震作用下的峰值加速度反应受输入地震波能量分布特征的控制,分布规律非常复杂.在工程中,应根据结构可能遭受的地震作用的能量分布特征,通过结构动力分析,确定节点的最优相对刚度比,以减小结构的动力反应.

Seismic Response Analysis of Precast Reinforced Concrete Frames with Ductile Connections

A hybrid beam element model with rotational springs at both ends is used to study the dynamic characteristics and responses of precast reinforced concrete frames under seismic excitations.The results indicate that the natural frequencies are increased with adding the relative stiffness ratio,and the change is apparent when the ratio varies between 0.1 and 10.The peak displacement responses decreases with adding the relative stiffness ratio,however,the varying tendency is affected by the energy distribution of seismic excitation and sometimes the local protuberance occurres.The peak acceleration responses are fully controlled by the relative stiffness ratio and the input seismic excitation,and their distributions are quite complicated. In order to reduce the dynamic responses under the seismic excitations with possible energy distributions,the optimum relative stiffness ratio of the ductile connection should be defined by using the dynamic analysis method.