【作者】 张建伟； 汤琳； 刘威亨； 韩瑞泽； 黄梦迪；

【Author】 ZHANG Jianwei;TANG Lin;LIU Weiheng;HAN Ruize;HUANG Mengdi;Key Laboratory of Urban and Engineering Security Disaster of China Ministry of Education, Beijing University of Technology;

【机构】 北京工业大学城市与工程安全减灾教育部重点实验室；

【摘要】 为了解可恢复功能再生混凝土梁柱节点损伤修复后的抗震性能,进行了3个梁柱中节点低周反复荷载试验。其中2个试件加载至1%水平位移角后卸载,分别采用外粘钢板和外粘角钢法对其损伤相对较重的梁端塑性铰区进行修复加固。基于试验,分析了各试件的损伤发展、滞回特性、承载与变形能力、钢筋应变等性能指标。通过强度和刚度退化系数考虑试件前期损伤影响,建立了有限元模型并进行了数值模拟。研究结果表明:在加载至1%位移角之前,试件的残余变形和裂缝宽度均较小,具有较好的可恢复性能;未修复直接加载至破坏的试件最终发生梁端剪切破坏,柱端和节点核心区混凝土的损伤程度较轻;损伤修复试件最终发生节点核心区剪切破坏,节点核心区剪切变形和箍筋应变较大,柱端损伤相对较轻;梁端外粘钢加固法提高了损伤试件的变形能力,外粘钢板加固试件的抗震性能略优于外粘角钢加固试件;梁端外粘钢加固法可延缓试件梁端纵筋和箍筋应变增长,在相同水平位移角下,损伤修复试件的梁端纵筋和箍筋应变值较小。更多还原

【Abstract】 To investigate the seismic performance of rehabilitated resilient recycled aggregate concrete beam-column joints after damage, quasi-static tests were conducted on three beam-column interior joints. Two specimens were loaded to 1% drift ratio and unloaded. External bonded steel plate and external bonded angle steel rehabilitation methods were used to rehabilitate the plastic hinge area of beams with relatively heavy damage, respectively. Based on experiments, the damage development, hysteresis characteristic, bearing capacity and deformation, and reinforcement strain of specimens were analyzed. Finite element models were established and numerical simulation was conducted considering pre-damage through strength degradation coefficient and stiffness degradation coefficient. The results indicated that the residual deformation and crack width of the specimens were relatively small before 1% drift ratio, indicating a good resilience performance. The shear failure of beam occurred in the specimen loaded directly to failure without rehabilitation ultimately, while the damage of the column and the joint core area was relatively slight. Shear failure of the joint core area occurred in the damaged rehabilitated specimens, with increased shear deformation and stirrup strain in the joint core area, and the damage of the column was relatively slight. Bonding steel in the plastic hinge of beams enhanced the deformation capacity of the damaged specimens. The seismic performance of specimen rehabilitated with external bonded steel plate was slightly superior to that of the specimen rehabilitated with external bonded angle steel. Bonding steel in the plastic hinge of beams can slow down the strain growth of the longitudinal reinforcement and stirrup in the beams. Under the same horizontal drift ratio, the strain values of the longitudinal reinforcement and stirrup in the damaged rehabilitated specimens were relatively small.更多还原