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考虑压-弯-剪共同作用的退化桥墩抗震性能及地震易损性分析

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服役中的桥梁往往处于氯离子侵蚀的恶劣环境,钢筋混凝土(RC)桥墩作为主要耗能构件,在受氯离子侵蚀后钢筋会发生锈蚀劣化,导致桥墩的抗侧向能力发生退化,进而使其抗震性能衰减.准确建立压-弯-剪共同作用(AFSI)的锈蚀RC桥墩数值模型,是实现桥梁全寿命抗震评估的前提.本文首先基于修正压力场理论(MCFT)和纤维截面模型以及锈蚀理论建立了考虑AFSI的退化桥墩模拟方法.然后,以AFSI数值模型为基础,对一座中等跨径RC桥梁的桥墩进行了全寿命周期的抗震能力分析.最后,建立了算例桥梁的有限元模型,进行地震易损性分析,并研究了剪切作用对桥墩损伤概率的影响.研究结果表明,本文提出的AFSI模拟方法可有效对锈蚀RC桥墩进行模拟;在桥梁全寿命周期内,桥墩的抗侧向能力和耗能能力发生退化;锈蚀作用提高了桥墩在地震作用下的损伤概率,不考虑剪切作用将高估桥墩的抗震性能,低估桥墩的损伤概率,该特征在强震和锈蚀程度较高的情况下越发显著.
Seismic performance and seismic fragility analysis of piers subject to chloride-induced corrosion considering axial-flexure-shear interaction
Bridges are often in a harsh environment of chloride-induced corrosion.The seismic performance of RC bridge pier will degrade after chloride-induced corrosion.The accurate establishment of the numerical model of axial compressive,flexural,and shear interaction(AFSI)for corroded RC bridge piers is a prerequisite for the seismic evaluation of the bridge lifetime.Firstly,based on the modified compression field theory(MCFT),fiber element model,and corrosion theory,a simulation method of corroded pier with AFSI in consideration was established.Then,based on the AFSI numerical model,the seismic capability of the piers of a medium-span RC bridge was analyzed for the whole life cycle.Finally,the finite element model of the bridge was established to analyze its seismic fragility,and the influence of shear action on the damage probability of the bridge pier was studied.The results show that the AFSI numerical model can effectively simulate the corroded pier.During the whole life cycle of the bridge,the lateral resistance and energy dissipation capacity of the pier degrade.Corrosion improves the damage probability of the pier under an earthquake,and the seismic performance of the pier will be overestimated without considering the shear action,which is more and more significant in the case of strong earthquake and high corrosion degree.

chloride-induced corrosionaxial compressive-flexural-shear interactionskeleton curveseismic fragility analysisRC bridge pier

胡思聪、马自强、陈宝魁、姜中煌

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南昌大学工程建设学院,南昌 330031

氯离子侵蚀 压-弯-剪共同作用 骨架曲线 易损性分析 RC桥墩

国家自然科学基金国家自然科学基金国家自然科学基金国家博士后科学基金江西省自然科学基金

5226803052268076518680482020M67197220224BAB204057

2024

中国科学(技术科学)
中国科学院

中国科学(技术科学)

CSTPCD北大核心
影响因子:0.752
ISSN:1674-7259
年,卷(期):2024.54(3)
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