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Title:: Seismic Fragility and Life-cycle Performance Assessment of the Continuous Beam Bridge Isolated with SMA-LRB

Author(s):: QIN Hongguo; LI Ping; ZHANG Zhichao; WANG Haohao; SHI Yan; (School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

Keywords:: continuous beam bridge; seismic isolation; Lead Rubber Bearings; the Shape Memory Alloy; seismic fragility

摘要:: 为研究采用LRB和SMA-LRB隔震连续梁桥的地震易损性和寿命周期成本损失,对比了采用两种不同隔震支座的桥梁在4种损伤状态下的损伤概率,并采用寿命周期成本损失评估方法计算了桥梁寿命周期内的各种地震损失成本。结果表明:在LRB隔震桥梁的基础上设置SMA既可以降低支座损伤概率,又可以有效降低桥墩在严重损伤和完全损伤状态下的损伤概率; 地震动强度较小时,SMA-LRB隔震桥梁在减少桥梁寿命周期成本损失方面的效果更为显著。

Abstract:: In order to study the seismic fragility and life-cycle performance of the continuous beam bridges isolated by Lead Rubber Bearings(LRB)and the Shape Memory Alloy supplemented Lead Rubber Bearings(SMA-LRB)respectively,the damage probabilities of the two types of bridges in four damaged conditions were compared,and then the life-cycle performance evaluation method was used to quantify the bridges' seismic losses in the form of money.The results show that the SMA-LRB isolation system can effectively decrease the damage probability of bearings and that of the pier seriously and completely damaged.The bridge life-cycle losses can be significantly reduced by SMA-LRB when the ground motion is weak.