摘要
为提高飞鸟式拱桥在系杆断索下的防连续性垮塌能力,基于强健性设计的备用路径法,结合相关工程案例与研究,提出了三角刚架区、钢管混凝土立柱、带斜压杆式立柱及立柱节点部分简支体系等4种局部加强结构体系;建立LS-DYNA显式动力学断索模拟方法,并基于室内试验数据与仿真结果进行了对比分析和验证;采用该断索模拟方法,对4种结构体系在系杆断索下的动力响应进行仿真,分别对主跨和边跨构件的内力极值进行了比较,并对结构承载力进行验算。研究结果表明:LS-DYNA动力分析法误差较小,适用于系杆拱桥中水平系杆断索的动力响应模拟分析;4种结构体系均有效降低了系杆断索下剩余结构的动力响应,其中钢管混凝土立柱体系对改善边拱肋弯矩和纵梁弯矩的动力响应最为显著,而立柱节点部分简支体系则最有利于降低主拱肋和立柱弯矩的动力响应;将钢管混凝土立柱体系应用于新建飞鸟式拱桥,从结构动力性能和外观协调性上综合效益最佳;将立柱节点部分简支体系应用于既有飞鸟式拱桥的改造,既能改善结构动力性能又能有效防止节点开裂,且施工成本低廉、简便易行,经济性最好,从而为该桥型的强健性设计和改造提供了各自适用、可行的途径。
To enhance the progressive collapse prevention ability of the fly-bird-type arch bridges in the event of tie bar failure,four locally strengthened structural systems were proposed based on the alternative path method of robust design along with relevant engineering cases and studies:triangular stiffener zone system,concrete-filled steel tube column system,columns with diagonal compression bars system,and partially simply-supported column connection system.An explicit dynamic cable-breaking simulation method was established using LS-DYNA.Based on laboratory test data and simulation results,the method was compared and validated.The dynamic response of four structural systems under tie bar failure was simulated using this cable-breaking simulation method.The ultimate internal force indices of main-span and side-span members were compared,and the structural bearing capacity of each system under tie bar failure conditions was evaluated.According to the results,with smaller error,the LS-DYNA dynamic analysis is suitable for simulating the dynamic response of horizontal tie bar failure of the tied-arch bridge.All four structural systems effectively reduce the dynamic response of the rest structures under tie bar failure.Specifically,the concrete-filled steel tube column system is most advantageous for reducing the dynamic response of the bending moment of the side arch rib and longitudinal beam,while the partially simply-supported column connection system is most effective in minimizing the dynamic response of bending moment of the main arch rib and column.The application of concrete-filled steel tube column systems in the construction of new fly-bird-type arch bridges provides the best overall benefits in terms of structural dynamic performance and aesthetic coordination.Meanwhile,the application of partially simply-supported column joints in the reinforcement of existing fly-bird-type arch bridges not only enhances structural dynamic performance but also effectively prevents joint cracking.Additionally,this approach maintains a low construction cost with simplicity and practicality,achieving the optimal economic efficiency.Therefore,practical and viable approaches are provided for the robust design and reinforcement of this type of bridge.
作者
范冰辉
邹金岐
陈铿
陈宝春
陈康明
FAN Bing-hui;ZOU Jin-qi;CHEN Keng;CHEN Bao-chun;CHEN Kang-ming(School of Civil Engineering,Fuzhou University,Fuzhou 350108,Fujian,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,Fujian,China)
出处
《交通运输工程学报》
北大核心
2025年第5期414-426,共13页
Journal of Traffic and Transportation Engineering
基金
国家自然科学基金项目(52078137)
福建省自然科学基金项目(2024J01355)。
关键词
桥梁工程
飞鸟式拱桥
强健性设计
防连续性垮塌
系杆断索
钢管混凝土立柱
立柱节点部分简支
bridge engineering
fly-bird-type arch bridge
robustness design
progressive collapse prevention
tie bar failure
concrete-filled steel tube column
partially simply-supported column connection
