功能自恢复预制装配式梁柱节点抗震性能试验研究

Experimental study on seismic behavior of earthquake resilient prefabricated beam-column joints

为提高预制装配式混凝土梁柱节点的抗震性能,提出利用SMA和ECC材料对预制梁柱节点进行连接。该试验共设计浇筑4个1/2缩尺比例试件,其中包括3个对比试件(现浇钢筋混凝土梁柱节点、预制装配式钢筋混凝土梁柱节点、预制装配式ECC增强梁柱节点)和1个模型节点(预制装配式SMA/ECC增强梁柱节点)。通过低周往复加载试验,分析了各个梁柱节点的破坏机理、承载力和自复位性能,研究了新型材料SMA和ECC应用到预制装配式梁柱节点连接处对梁柱节点性能的影响。研究结果表明:将SMA以及ECC应用到装配式梁柱节点中,虽然会降低节点的初始刚度和耗能能力,但是能够降低节点的残余变形和刚度退化速度,增强节点的延性和自复位能力,节点具有较好的震后功能自恢复能力。

In order to improve the seismic performance of prefabricated concrete frame joints, a method of utilizing new materials SMA and ECC to connect the prefabricated beam-column joints was proposed.A total of four 1/2-scale specimens, including three comparative specimens(cast-in-place reinforced concrete beam-column joint, prefabricated assembly reinforced concrete beam-column joint, prefabricated assembly ECC reinforced beam-column joint) and one target specimens(prefabricated assembly SMA/ECC reinforced beam-column joint) were designed and tested.Those specimens were tested and studied under the low-cycle reciprocating loading for the failure mechanism, bearing capacity and self-centering performance of each beam-column joint, and the influences of the new materials of SMA and ECC in the connection on the performance of prefabricated beam-column joint are investigated.The results show that the application of SMA and ECC to the prefabricated beam-column joint may slightly reduce the initial stiffness and energy dissipation capacity of the structure, but the new materials may significantly improve the ductility and self-centering performance of the structure and reduce the speed of structural stiffness degradation.The beam-column joints have good earthquake resilient capability.