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摘要: SMA-LRB复合型支座是在LRB支座上布置SMA丝的一种新型减隔震装置。文中分别对SMA丝单线交叉和双线交叉布置的SMA-LRB复合型支座进行试验研究，结果显示，SMA丝双线交叉布置的SMA-LRB复合型支座的性能更好。采用OpenSees软件建立了分别设置LRB和SMA丝双线交叉布置的SMA-LRB复合型支座的隔震连续梁桥有限元模型，并进行地震时程分析，通过地震易损性分析得到了桥墩和支座的易损性曲线。结果表明，SMA-LRB复合型支座可以有效减小主梁的残余位移，在地震中SMA-LRB复合型支座依靠其良好的自复位和耗能能力，能够避免变形过大引起的剪切破坏。
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关键词:
- 铅芯橡胶支座 /
- 形状记忆合金 /
- SMA-LRB复合型支座 /
- 隔震连续梁桥 /
- 地震易损性分析
Abstract: The SMA-LRB is a new type of isolation device that arranges SMA wire on the LRB. The SMA-LRB with single-line and double-line crossed SMA wire were tested respectively. The test results show that the double-line crossed composite bearing has better performance. The benchmark model of continuous girder bridge with LRB and SMA-LRB composite isolation bearings was established by OpenSees software and the seismic time history analysis was performed. The fragility curve of the bridge pier and the rubber bearing was obtained by seismic fragility analysis. The results show that the use of SMA-LRB reduces the residual displacement of the girder effectively. The SMALRB composite bearing can avoid shear damage caused by excessive deformation due to its self-centering and energy dissipation ability during the earthquake. -
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