- 摘 要
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（1 同濟大學土木工程防災國家重點試驗室， 上海 200092； 2 同濟大學建筑工程系， 上海 200092）
［摘要］已有研究顯示，角鋼尺寸對SMA節(jié)點滯回耗能和自回復性能有很大的影響，施加初始預應變可以顯著改善節(jié)點小變形下的力學行為。為了進一步討論螺桿預應變和角鋼尺寸對SMA節(jié)點自回復性能的影響，分別以螺桿預應變、角鋼承載力比為參數(shù)設計了一系列SMA節(jié)點，采用ANSYS14.5對上述節(jié)點進行有限元模擬，并分別從剛度、強度、延性、滯回耗能和自回復性能等五個方面討論螺桿預應變和角鋼承載力比對SMA節(jié)點抗震性能的影響。有限元結果表明：SMA節(jié)點殘余層間位移角和滯回耗能量均與角鋼承載力比近似呈線性關系；施加初始預應變可以明顯改善節(jié)點初始剛度、提高節(jié)點極限承載力和自回復性能，但不能保證節(jié)點在大層間位移角下的延性。
［關鍵詞］SMA節(jié)點； 角鋼承載力比； 螺桿預應變； 自回復性能； 有限元模擬
中圖分類號： TU391 文獻標識碼： A文章編號： 1002-848X(2016)S1-0558-05
Numerical study of self-centering performance of shape memory alloy (SMA) connections
Liu Jia1,2, Wang Wei1,2
(1 State key laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
2 Department of Building Engineering, Tongji University, Shanghai 200092, China)
Abstract: Previous research shows angle size had much influence on hysteretic energy dissipation and self-centering performance of SMA connections and applying pre-strain could improve mechanical behavior of SMA connections at small story-drift. A series of SMA connections were designed with respect to pre-strain of SMA bars and ratio of angle capacity to further discuss the effect of these two factors on seismic performance of SMA connections. FEM analysis software ANSYS14.5 was adopted to establish and simulate SMA connections. Then, the connections were discussed from stiffness, strength, ductility, hysteretic energy dissipation and self-centering capacity respectively. Numerical results indicate both residual story-drift and hysteretic energy dissipation of SMA connections changed nearly linearly with the ratio of angle capacity. In addition, applying initial pre-strain could improve connection stiffness significantly; it could promote ultimate capacity and self-centering performance as well. But, it couldn't guarantee connection ductility at large story-drift.
Keywords: SMA connection; ratio of angle capacity; pre-strain of SMA bar; self-centering capacity; numerical study
作者簡介： 王偉，教授，博士生導師，Email:weiwang@#edu.cn。
*曙光計劃，十二五國家科技支撐計劃課題（2015BAL03B01）。
