一种新型变梁截面异型节点抗震性能研究

摘要

为进一步优化变梁截面异型节点的抗震性能,设计制作了一个新型变梁截面异型节点,即PVA-ECC柱-钢筋混凝土梁异型节点,同时制作了一个普通钢筋混凝土变梁截面异型节点作对比,进行了拟静力试验.对比分析了二个试件在水平低周往复荷载作用下的承载能力、滞回曲线、刚度退化、耗能性能以及裂缝发展情况与破坏模式.试验结果表明:在相同配筋下,PVA-ECC柱-钢筋混凝土梁异型节点发生梁端塑性铰破坏,而普通变梁截面异型节点发生柱端塑性铰破坏.在全柱身使用PVA-ECC材料,可以在一定程度上提高变梁截面异型节点的承载力、延性、耗能能力,改善变梁截面异型节点的刚度退化现象,有效提高变梁截面异型节点的抗震性能.%In order to further optimize the seismic performance of the abnormal joint with changed beam section,one PVA-ECC columnreinforced concrete beams abnormal joint and one ordinary reinforced concrete abnormal joint with changed beam section are designed respectively.Quasi-static test of the two test specimens is carried out.Bearing capacity,hysteretic curves,skeleton curves,displacement ductility,stiffness degradation,energy-dissipation ability,crack development and failure pattern of the two test specimens are obtained and compared.The test results show that plastic hinge occurs at the beam-end of the PVA-ECC column and reinforced concrete beam abnormal joint,and the plastic hinge appears at the column-end of ordinary abnormal joint with changed beam section.The use of PVA-ECC material in the whole column can enhance the bearing capacity,ductility and energy dissipation capacity of the abnormal joint with changed beam section to a certain extent,and also improve the stiffness degradation rule of the abnormal joint with changed beam section.