Cyclic behavior of connections equipped with NiTi shape memory alloy and steel tendons between H-shaped beam to CHS column
Cyclic behavior of connections equipped with NiTi shape memory alloy and steel tendons between H-shaped beam to CHS column
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DOI：
10.1016/j.engstruct.2015.01.028
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发表时间：
2015-04
影响因子：
5.5
通讯作者：
Wen Wang;T. Chan;H. Shao;Yiyi Chen
中科院分区：
文献类型：
--
作者：
Wen Wang;T. Chan;H. Shao;Yiyi Chen
形状记忆合金（SMA）是一类智能材料，其能够经历大的变形，同时在加热时或通过释放引起变形的应力而恢复到其原始未变形形状。当它们装备在结构钢框架内的连接件中时，这种独特的性质可以在严重事件之后增强结构的重定中心能力。本文提出了一种新型的H形梁-钢管混凝土柱连接节点--超弹性SMA筋与钢筋相结合的节点。通过6个足尺模型试件的试验，研究了SMA与钢筋不同组合形式下的重定心性能和耗能性能。新型节点由初始直径为12 mm的SMA筋、初始直径为12 mm的钢筋、外伸端板、外隔板和梁翼缘肋组成。试验结果表明，SMA筋节点在层间位移角小于6%的循环荷载作用下，具有良好的耗能能力、双旗形滞回曲线和良好的重定心能力。
Shape memory alloys (SMAs) are a class of smart materials which are able to undergo large deformations while reverting back to their original undeformed shape upon heating or by relieving the stress that causes the deformation. When they are equipped in connections within a structural steel frame, this unique property could enhance the recentering capability of the structure after severe event. In this paper, a novel connection – integrating superelastic SMA tendons with steel tendons, is proposed between a H-shaped beam to a CHS column. Six full-scale prototype specimens with different combination of SMA and steel tendons were tested to evaluate the recentering capability and the energy dissipative performance. The novel connection consists of SMA tendons with original diameter of 12 mm, steel tendons with original diameter of 12 mm, extended end-plate, external diaphragm and beam flange ribs. Test results showed that connections equipped with SMA tendons exhibit moderate energy dissipation, double-flag-shaped hysteresis loops and excellent recentering capability after being subjected to cyclic loads up to 6% interstory drift angle.