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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。
Structural transformation and reinforcement, the new column to add a new beam is often encountered engineering problems. Under the same test conditions, the pseudo-static test of the cast-in-situ reinforced concrete beam-column joint and the new-type old column new-girder joint were carried out. The bearing capacity, ductility, stiffness degradation, energy dissipation capacity and other seismic performance and failure characteristics of the two beam and column joints are compared. The test results show that the bearing capacity and seismic performance of the new type of old beam can meet the requirements of “Design Code for Concrete Structure” of GB 50010-2010, and the ductility of the new type of new beam is close to that of cast-in-place. However, the carrying capacity and energy dissipation capacity of the new type of node Lower than the whole pouring node. The load-bearing capacity and seismic performance of new joints, anchorage joints and pouring joints are simulated and analyzed by ANSYS finite element software. The simulation results are similar to the experimental results. The overall performance of the new joints and anchorage joints is slightly lower than that of the pouring joints, The bearing capacity and ductility factor of the new type of node are slightly higher than that of the anchorage node.