不同冲刷及腐蚀环境下连续桥梁的概率地震需求分析  

Probabilistic Seismic Demand Analysis of Continuous Bridges Under Different Erosion and Corrosion Environments

作　　者：陈刚 朱云会 陈小勇 李俊杰 何余良[2] CHEN Gang;ZHU Yunhui;CHEN Xiaoyong;LI Junjie;HE Yuliang

机构地区：[1]绍兴市交通建设有限公司,浙江绍兴312000 [2]绍兴文理学院,浙江绍兴312000

出　　处：《浙江建筑》2023年第6期29-34,共6页Zhejiang Construction

基　　金：绍兴市产业关键技术攻关项目“可拆卸钢-混杂纤维混凝土组合梁桥关键技术及设计应用”(2022B43002);2022年浙江省建设科研项目“大跨度预应力混凝土空心板在装配式建筑结构中的应用研究”(2022K240)。

摘　　要：沿海桥梁在使用过程中,由于受水流冲刷和氯离子侵蚀等环境因素影响,桥梁的材料性能会随着使用年限的增加而逐渐退化,以及土体对桩基约束下降,其抗震性能随之降低。结构或构件的地震需求是反映结构或构件在地震作用下适用性和安全性的最大性能表现。通过对桥梁在4种冲刷深度和4种腐蚀程度下进行纵横桥两个方向的Pushover分析,研究桥梁在4种冲刷深度与4种腐蚀程度纵横桥方向上的概率地震需求分析。分析表明桥墩的柱底剪力随着冲刷深度和腐蚀程度的增加而逐渐降低,相比于腐蚀,冲刷的影响更大;随后对地震参数和地震强度进行线性回归分析,得到不同冲刷深度和腐蚀程度下纵横桥方向上的概率地震需求模型。In the process of using coastal bridges,due to the influence of environmental factors such as Current erosion and chloride ion corrosion,the performance of various materials of bridges will gradually deteriorate with the increase of service life,and the seismic performance will also decrease because of the constraining force of pile foundation from soil mass getting decline,and it is a static nonlinear analysis method.The seismic requirement of structure or component is the maximum performance that reflects the applicability and safety of structure or component under earthquake action.In this paper,probabilistic seismic demand analysis is carried out for scour corroded bridges,pushover analysis is carried out for cross bridge and longitudinal bridge in four kinds of erosion depth and four kinds of corrosion degree,and probabilistic seismic demand analysis is carried out for bridge in four kinds of erosion depth and four kinds of corrosion degree in cross bridge and longitudinal bridge.The probabilistic seismic demand analysis of bridges can not only reflect the uncertainty under the action of earthquakes,but also reflect the uncertainty of the structure under the action of earthquakes.The results of probabilistic seismic demand analysis can also directly reflect the relation‐ship between the structural response and the intensity of earthquakes.

关 键 词：冲刷腐蚀 抗震 PUSHOVER分析 失效概率 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]