新型钢筋混凝土旧柱新梁节点抗震性能研究

RESEARCH ON SEISMIC BEHAVIOR OF A NEW TYPE OF OLD COLUMN AND NEW BEAM CONNECTIONS

结构改造加固中,旧柱上增设新梁是经常遇到的工程问题。在相同试验条件下,对整浇钢筋混凝土梁柱节点和新型旧柱新梁节点进行拟静力试验。比较这两种梁柱节点的承载力、延性、刚度退化、耗能能力等抗震性能及破坏特征。试验结果表明:新型旧柱新梁节点承载力及抗震性能均能满足GB 50010—2010《混凝土结构设计规范》的要求,其延性也接近整浇节点,但新型节点的承载能力和耗能能力略低于整浇节点。采用ANSYS有限元软件模拟分析了新型节点、植筋节点和整浇节点的承载能力和抗震性能,模拟结果与试验结果类似:新型节点、植筋节点的整体性能都略低于整浇节点,但新型节点的承载能力和延性系数略高于植筋节点。

The old column add new beam for reinforcement is often encountered in engineering problems,in the same test conditions, The quasi-static tests on integral casting beam-column joints and old column and new beam connections were carried out. The comparison of bearing capacity,ductility,stiffness degradation,energy-dissipating capacity and failure modes of the two connections was conducted. The results indicated that the bearing capacity and seismic behavior of old column and new beam connections could basically meet the specification requirements,and the ductility was close to that of the integral casting beam-column joints. However,the bearing capacity and energydissipating capacity of old column and new beam connections was slightly lower than that of the integral casting beamcolumn joint. By using ANSYS,the numerical simulations were performed on the bearing capacity and seismic behavior of the old column and new beam connections,the planting bar joints and integral casting beam-column joints. The experiment and simulation results were similar： the overall performance of the old column and new beam connections and the planting bar joints were lower than that of the integral casting beam-column joints,but the bearing capacity and ductility of old column and new beam connections were slightly higher than that of the planting bar joints.