驳船撞击下RC桥墩的非线性动力响应与损伤特征分析  

Nonlinear Dynamic Response and Damage Characteristic Analysis of RC Pier under Barge Collision

作　　者：邵俊虎 占玉林[2] 陈宁[3] 向正松 SHAO Junhu;ZHAN Yulin;CHEN Ning;XIANG Zhengsong(School of Architecture and Civil Engineering of Chengdu University,Chengdu 610106,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Survey and Design Company of Sichuan Road&Bridge,Chengdu 610004,China)

机构地区：[1]成都大学建筑与土木工程学院,四川成都610106 [2]西南交通大学土木工程学院,四川成都610031 [3]湖南科技大学土木工程学院,湖南湘潭411201 [4]四川路桥勘察设计分公司,四川成都610004

出　　处：《防灾减灾工程学报》2022年第1期81-91,共11页Journal of Disaster Prevention and Mitigation Engineering

基　　金：四川省科技计划项目(2017JY0514);国家自然科学基金项目(51878564);国家重点研发计划项目(2016YFB1200401);湖南省教育厅一般项目(16C0645)资助。

摘　　要：针对世界范围内时有发生的船舶撞击桥梁事故,为研究桥墩在驳船撞击下桥墩的动力响应与损伤特征,建立了驳船-桥墩碰撞的有限元模型。通过与已有落锤冲击试验的结果进行了对比,对本文有限元模型的可靠性进行了验证。基于本文建立的驳船-桥墩碰撞有限元模型,分析了1000 t驳船以4 m/s速度撞击下桥墩的动力响应与损伤变化机理,并研究了驳船撞击速度、撞击吨位、撞击点以及轴压比对损伤特征的影响规律。结果表明,桥墩较不利部位为撞击点区域与墩底区域,钢筋应变率效应使钢筋屈服强度提高11.7%~22%,一定程度上会增大桥墩抗力;撞击速度与吨位会影响桥墩的损伤程度,但不会影响桥墩的损伤特征;撞击点与轴压比的变化会改变桥墩的损伤程度与特征;随着撞击点的减小与轴压比的增大在一定程度上会增大桥墩的抗撞能力。Regarding frequent accidents of ship-bridge collisions around the world,a finite element model of barge-pier collision was established to study the dynamic response and damage characteristics of the pier under barge impact.The reliability of the finite element model is verified by comparing it with the results of the previous drop impact test.Based on the finite element model,the dynamic response and damage evolution mechanism of piers under 1000 t barge collision at the speed of 4 m/s are investigated,and the influence of impact velocity,impact tonnage,impact point and axial compression ratio on the damage characteristics is studied.The results show that the most disadvantageous positions is the pier bottom and collision point area;the yield strength of rebar is improvedby 11.7%~22% due to the strain rate effect,which increases the resistance of the pier;the collision velocity and tonnage can affect the damage degree of the pier,but do not affect the damage characteristics of the pier;the damage degree and characteristics are changed by the impact point and the axial compression ratio;the resistance of piers increase with decreased impact points and increased axial compression ratio.

关 键 词：桥墩 船撞桥 非线性动力响应 损伤特征 平均损伤因子 

分 类 号：TU443[建筑科学—岩土工程]