【摘要】 基于三维钢筋混凝土框架节点试验(包括施加低周反复荷载预震损、灌缝修复处理、运用玄武岩纤维加固和施加低周反复荷载至节点破坏试验),研究玄武岩纤维对震损钢筋混凝土框架节点的加固效果。根据试验现象和试验数据,对不同三维框架节点的破坏模式、滞回曲线、骨架曲线、极限承载力、延性系数以及节点表面的玄武岩纤维的应变等参数进行对比分析。研究结果表明:运用玄武岩纤维加固的三维钢筋混凝土框架节点均实现了"强柱弱梁"的设计目标,破坏形态均为梁弯曲破坏形式,加固后节点的滞回曲线饱满,极限承载力和位移延性系数均有所提高,节点的抗震性能得到很大提高。更多还原

【Abstract】 Based on the test of repaired column-beam joints(C-BJs) pre-damaged under low cycle reversed loading,seismic performance of the C-BJs strengthened with basalt fiber sheets was studied.The test procedures included pre-damage,rehabilitation,reinforcement with basalt fiber sheets and re-test under low cycle reversed loading.According to the test phenomena and test data,the failure modes,hysteresis curves,skeleton curves,ultimate bearing capacity,ductility and the strain of the basalt fiber sheets of different C-BJs were compared and analyzed.The test results show that the C-BJs strengthened with basalt fiber sheets exhibit strong column-weak beam failure mechanism.All connections fail due to the concrete crushing and rupture of longitudinal bars as a result of plastic hinges at the fixed beam end.The hysteretic curves of the C-BJs strengthened with basalt fiber sheets are full and show better energy dissipation.The reinforcement with basalt fiber sheets has a significant effect on increasing the ultimate bearing capacity and improving the displacement ductility and the seismic behaviors of the C-BJs.更多还原