钢绞线网片-聚合物砂浆加固空间框架节点试验

Experimental study on RC space beam-column joints strengthened with high strength steel wire mesh and polymer mortar

提出了采用新技术高强钢绞线网片-聚合物砂浆加固技术提高钢筋混凝土空间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空间框架节点试件的低周反复加载试验对该加固方法进行了检验.试验结果表明:加固能够有效地提高节点的极限受剪承载力22%左右,改变节点的破坏模式为梁端延性破坏,提高节点的延性系数到4以上,改善节点的承载力退化和刚度退化,提高节点的能量耗散能力,从而显著改善了梁柱节点的抗震性能.根据试验研究结果提出了该技术加固梁柱节点的设计和施工时的建议.

An innovative strengthening scheme for reinforced concrete space beam-column joints using high strength steel wire mesh and polymer mortar jacket 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 experimental results show that the seismic behavior of strengthened joints is improved significantly by the scheme, which successfully enhances the shear capacity by about 22%, transforms the failure mode to be ductile, raises the ductility coefficient over 4, delays the strength degradation and stiffness degradation, and upgrades the energy dissipation capacity. Finally, some suggestion is put forward for design and construction about using the technique to strengthen beam-column joint.