考虑混凝土耐久性-地震随机性的高桩码头时变可靠度研究  

Time-dependent Reliability Analysis of High Pile Wharf Considering Concrete Durability and Seismic Randomness

作　　者：周扬[1,2] 李思瀚 庞锐 徐斌[1,2] 刘明亮[2] ZHOU Yang;LI Sihan;PANG Rui;XU Bin;LIU Mingliang(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;School of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学建设工程学院,辽宁大连116024

出　　处：《水利与建筑工程学报》2024年第6期98-105,165,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研发课题(2021YFB2601102)。

摘　　要：为了研究高桩码头长期使用情况下,其结构性能出现的退化现象,利用时间相关的钢筋混凝土性能退化模型,综合考虑混凝土耐久性与地震随机性之间的相关性,结合直接概率积分(DPIM)方法对高桩码头进行随机动力分析和时变可靠度分析,获得不同运行年限下高桩码头在地震激励下的响应概率信息以及时变可靠度曲线。结果显示:随着运行年限的增加,码头上部结构的水平位移概率密度曲线(PDF)、累积分布曲线(CDF)峰值有所下降,动力可靠度随使用年限大幅下降,反映结构体系的性能退化逐渐加快,体现出钢筋混凝土退化对高桩码头地震安全性的显著影响。In the process of long-term use,the structural performance of high pile wharf will inevitably degrade,which will not only affect the safety and stability,but also have serious impacts on the normal operation and economic benefits.Based on the time-dependent reinforced concrete performance degradation model,the stochastic dynamic analysis and time-varying reliability analysis are carried out by combining the direct probability integral method(DPIM),the response probability information and time-varying reliability curves under earthquake excitation under different operating years are obtained.The results show that with the increase of the operation life,the peak value of the displacement PDF and CDF of the wharf superstructure decreases,the dynamic reliability decreases sharply with the service life,and the performance degradation of the reaction structure system accelerates gradually.It shows that reinforced concrete degradation has significant influence on the safety of high pile wharf.

关 键 词：高桩码头 混凝土耐久性 直接概率积分(DPIM) 可靠度分析 结构性能退化 

分 类 号：U657.3[交通运输工程—港口、海岸及近海工程]