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为研究采用马氏体镍钛形状记忆合金螺杆的钢框架梁柱节点力学性能和耗能能力,对马氏体镍钛形状记忆合金材料进行了单调拉伸和形状记忆效应试验,对采用马氏体镍钛形状记忆合金螺杆的梁柱节点进行了拟静力试验和加热修复后的再次试验。研究结果表明:镍钛合金具有较大的可回复应变,从而能够适应节点不同程度损伤状态的性能修复要求;采用马氏体镍钛形状记忆合金螺杆的钢框架梁柱节点具有稳定的滞回性能和耗能能力;节点具有后期强化效应,能够一定程度上弥补或消除节点部位受损元件引起的节点性能退化;镍钛合金独特的形状记忆效应和优越的疲劳性能确保了镍钛形状记忆合金螺杆的可重复使用和复原节点性能的能力;螺杆应变过大将导致形状记忆效应衰退,加热修复后将产生残余变形。最后,通过与角钢连接和钢螺杆连接的钢框架梁柱节点的性能对比分析,发现采用马氏体镍钛形状记忆合金螺杆的钢框架梁柱节点具有更好的延性和能量耗散能力。
In order to study the mechanical properties and energy dissipation capacity of the beam-column joints of martensite NiTi shape memory alloy screw, monotonous tensile and shape memory effect tests were carried out on martensitic NiTi shape memory alloy. Ni-Ti shape memory alloy screw beam and column joints were quasi-static test and reheat after the re-test. The results show that the nickel-titanium alloy has a large recoverable strain, which can meet the performance requirements of different damage states of the joints. The steel frame beam-column joints with martensite NiTi shape memory alloy screw have stable hysteresis And energy dissipation ability. The node has the late strengthening effect, which can make up or eliminate the node performance deterioration caused by the damaged components of the node to a certain extent. The unique shape memory effect and superior fatigue performance of the nickel-titanium alloy ensure that the nickel-titanium shape memory alloy screw Of the ability to re-use and restore node performance; screw strain is too large will lead to shape memory effect recession, heat repair will have residual deformation. Finally, by comparing the performance of steel frame beam-column joints with angle steel and steel screw, it is found that the steel frame beam-column joints with martensitic nickel-titanium shape memory alloy screw have better ductility and energy dissipation ability.