双工字钢板组合梁桥的时变体系冗余性评估  

Assessment of time-varying system redundancyof steel-concrete composite twin I-girder bridge

作　　者：王晓明[1] 邓华 张浩楠 袁通[1] 朱传超 田鹏程 张煜博 Wang Xiaoming;Deng Hua;Zhang Haonan;Yuan Tong;Zhu Chuanchao;Tian Pengcheng;Zhang Yubo(School of Highway,Chang an University,Xi'an 710064,China)

机构地区：[1]长安大学公路学院,西安710064

出　　处：《东南大学学报（自然科学版）》2024年第2期312-320,共9页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52178104);中央高校基本科研业务费专项资金资助项目(300102212905)。

摘　　要：为评估双工字钢板组合梁桥应对非对称极端作用的时变体系冗余性,采用数值增量算法,开展了双工字钢板组合梁桥非对称荷载下的弹塑性全过程分析.提出了基于弹塑性累积应变能的构件承载贡献率指标,研究了双工字钢板组合梁桥时变体系冗余性的影响因素及变化规律,揭示了双工字钢板组合梁桥冗余性不足的内在原因.结果表明:横向刚度和主梁延性是影响钢板组合梁桥体系冗余性的主要因素,横向传力刚度越大,主梁延性越高,则结构体系冗余性越强;与典型多主梁体系相比,双工字钢板组合梁桥的横向传力刚度降低约24%,导致结构冗余度降低约55%;材料劣化引起的主梁延性退化会导致冗余度在寿命周期最大下降约25%.To evaluate the time-varying system redundancy of steel-concrete composite twin I-girder bridge to cope with asymmetric extreme load,numerical incremental algorithm was adopted to conduct the elastic-plastic whole process analysis of steel-concrete composite twin I-girder bridge under asymmetric load.The index of load contribution rate of members based on elastic-plastic cumulative strain energy was proposed.The influencing factors and changing rules of the time-varying system redundancy of twin I-girder bridges were investigated.The inherent reasons for the lack of redundancy of steel-concrete composite twin I-girder bridge were revealed.The results show that transverse stiffness and main girder ductility are the main factors affecting the redundancy of steel-concrete composite twin I-girder bridge,the greater the transverse force transfer stiffness and the higher the main girder ductility,the stronger the redundancy of the structural system.Compared with the typical multi-main girder system,the transverse force transfer stiffness of steel-concrete composite twin I-girder bridge is reduced by about 24%,resulting in a decrease in structural redundancy of about 55%.The ductility deterioration of the main girder due to the material deterioration causes a maximum decrease in the redundancy of about 25%during the life cycle.

关 键 词：双工字钢板组合梁桥 体系非线性冗余 传力刚度 内力重分布 延性退化 

分 类 号：TU312.3[建筑科学—结构工程] TU398.9