加肋钢悬臂支撑-底部钢板组合桥面拓宽技术  

A bridge deck widening technology through rationally combining steel ribbed cantilever support-bottom reinforcement steel plate

作　　者：谭万里 余嘉康 孙庄敬 邓晖 熊子多 梅甘娜 王东东[2] TAN Wanli;YU Jiakang;SUN Zhuangjing;DENG Hui;XIONG Ziduo;ELENGA France Megane;WANG Dongdong(CCCC First Highway Xiamen Engineering Co.Ltd,Xiamen 361021,China;Fujian Key Laboratory of Digital Simulations for Coastal Civil Engineering,School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China;Xiamen Road and Bridge Construction Group Co.Ltd,Xiamen 361000,China)

机构地区：[1]中交一公局厦门工程有限公司,福建厦门361021 [2]厦门大学建筑与土木工程学院,福建省滨海土木工程数字仿真重点实验室,福建厦门361005 [3]厦门路桥建设集团有限公司,福建厦门361000

出　　处：《厦门大学学报（自然科学版）》2024年第4期743-752,共10页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(12072302);福建省自然科学基金(2021J02003)。

摘　　要：[目的]在桥面拓宽施工过程中,常出现新旧桥连接处纵向开裂、拓宽桥面横向开裂等典型问题,如何通过优化和改进桥面拓宽技术解决这些问题是桥梁工程的一个重要内容.[方法]以国内首座跨海大桥——厦门大桥的桥面拓宽工程为背景,提出了一种加肋钢悬臂支撑-底部钢板组合的桥面拓宽方法.该方法有机结合了钢-混组合梁、正交异性钢悬臂板、底部加固钢板等桥面拓宽加固方法,采用混凝土现浇板作为桥面板、湿接法连接新旧桥梁,然后通过外延加肋钢悬臂构建支撑结构,并兼做现浇桥面混凝土的永久性模板.[结果]厦门大桥桥面拓宽加固工程的三维有限元仿真结果表明,钢悬臂布置间距增大会导致拓宽部分混凝土桥面板的拉应力增加,而设置下部加固钢板对于拓宽桥梁结构的挠度和应力分布影响明显.[结论]通过合理布置钢悬臂支撑结构和底部钢板,可显著减少拓宽部分混凝土纵横向裂缝的产生,改善拓宽后的桥梁的力学性能.相关成果有效支撑了厦门大桥的拓宽加固改造施工,为同类工程提供了有益的参考.[Objective]The construction of widening bridge decks often encounters several challenging issues,for instance,the longitudinal cracks occurring at the intersections between the new and existing sections of the bridge,and the transverse cracks appearing within the widened portions of the bridge.A proper addressing of these issues by enhancing and refining the methods for widening bridge decks constitutes a highly significant aspect of bridge engineering.Through the improvement and optimization of structural design and construction,it is feasible to ensure the bridge integrity and longevity and thereby consolidate its overall safety and performance.[Methods]Based upon the deck widening project for the first cross-sea bridge in China-Xiamen Bridge,the proposed approach rationally combines the strengths of several deck widening methods,namely,steel-concrete composite beam,orthotropic steel cantilever plate,and the bottom reinforcement plate.According to the proposed methodology,the cast-in-place concrete slab is employed as the bridge deck,and a wet connection is adopted to link the original and added parts of the bridge deck.The bridge widening parts are sustained by successive steel ribbed cantilever supports,which are also severe as the permanent formworks for the cast-in-place bridge deck concrete.Meanwhile,a three-dimensional finite element study conducted on the bridge deck expansion of the China-Xiamen Bridge yields crucial insights into the structural behavior and two reinforcement strategies employed.[Results]The investigation meticulously examines the effects of adjusting the spacing between adjacent steel ribbed cantilever supports on the distribution of tensile stress within the enlarged concrete bridge slab.The results indicate that there is a positive correlation between the layout spacing of the extended steel ribbed cantilever support structure(ranging from 0 to 0.5 meters)and the deflection of the bridge deck,as implies that as the spacing of the steel ribbed cantilever support increases,so does the

关 键 词：厦门大桥 桥面拓宽 加肋钢悬臂支撑 底部加固钢板 桥面裂缝 

分 类 号：TU448[建筑科学—岩土工程]