高强钢绞线网-聚合物砂浆加固带有直交梁和楼板的框架节点的试验研究

提出了采用高强钢绞线网-聚合物砂浆加固提高带有直交梁和楼板的框架节点抗震性能的方法,并通过3个带有直交梁和楼板的框架节点试件的低周反复加载试验对该方法进行了检验。试验结果表明:加固后能够有效地改善梁柱节点的抗震性能,提高节点的受剪承载力和延性,出现梁铰的延性破坏形态,改善节点的强度退化和刚度退化,提高节点的能量耗散能力。当框架节点存在直交梁时,可以在节点核心区钻斜洞穿过X形钢绞线束进行加固。最后,分析了节点加固的受力机理,提出了该技术加固梁柱节点的设计和施工建议。

Experimental study on beam-column joints with floor slab and transverse beams strengthened with high strength steel wire mesh and polymer mortar

An innovative strengthening scheme for reinforced concrete beam-column joints with floor slab and transverse beams using high strength steel wire mesh and polymer mortar was proposed,and the quasi-static tests of three reinforced concrete beam-column joints with floor slab and transverse beams were performed to verify the efficiency of the strengthening scheme.The test results show that the seismic behavior of strengthened joints is improved significantly by the scheme,which was successful in enhancing the shear capacity and ductility,leading to ductile beam hinging as mode of failure,delaying the strength degradation and stiffness degradation,upgrading the energy dissipation capacity.When cores of beam-column joints in two-way frames can′t be directly upgraded due to the existence of two-way beams,they can be strengthened by adding diagonal reinforcement in X shape through the joints.Then the strengthening mechanism is presented with different methods.Finally,suggestion of design and operation is put forward when the above technique is adopted.