采用马氏体镍钛形状记忆合金螺杆的钢框架梁柱节点滞回性能试验研究

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。

Experiment on hysteretic behavior of beam-to-column connection using martensite NiTi shape memory alloy threaded rods in steel frame

In order to investigate the mechanical properties and energy dissipation capacity of the beam-to-column connections using martensite NiTi shape memory alloy threaded rods(SMA connections),the monotonic tensile properties and shape memory effect of NiTi alloy bars were tested,and the quasi-static tests of the SMA connections and the retests of the above connections after heating repair were conducted.The experimental results show that the NiTi alloy has so large recoverable strain that it can satisfy the reh...