框架节点在不同加载方式下抗震性能试验研究

Comparison on seismic performance under different loading method of concrete spatial frame joints

针对混凝土框架节点的拟静力抗震性能试验研究,采用平面加载装置和空间加载装置对6个节点进行单、双向水平反复的对比试验,得到不同加载方式和加载制度下试件的滞回曲线.通过对各个试件的破坏形态、承载力、刚度、骨架曲线、延性及耗能能力的对比分析,表明二维作用下对空间节点的抗震性能影响更敏感,构件耦合作用明显,扭转效应显著.研究结果表明:试验方法对节点的抗震性能影响较大,将低维条件下节点的抗震性能研究成果推广到更高维的层次上有一定的局限性.

In order to analyze the seismic performance of concrete spatial frame joints under quasi-static test,the comparison of 6 specimens experiments are carried out under uniaxial and biaxial cyclic lateral loading on different loading devices.The relationship between force and displacement is obtained in different loading method and loading path.Through the analysis comparison of failure features,bearing capacity,stiffness,skeleton curves,ductility and dissipated energy,two-dimensional loading path is more sensitive to the seismic behavior of spatial frame joints,it can be concluded that the coupling effect is obvious under biaxial lateral load,the torsional phenomenon exists in specimens also.Test results indicate that the different experiment method has different effects on seismic behavior of spatial frame joints.So it has limitation that low-dimensional research result of seismic behavior is extended to high-dimensional application.