东南大学学报（自然科学版）2024，Vol.54Issue(2)：312-320,9.DOI:10.3969/j.issn.1001-0505.2024.02.008
双工字钢板组合梁桥的时变体系冗余性评估
Assessment of time-varying system redundancy of steel-concrete composite twin I-girder bridge
摘要
Abstract
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 influen-cing factors and changing rules of the time-varying system redundancy of twin I-girder bridges were investiga-ted.The inherent reasons for the lack of redundancy of steel-concrete composite twin I-girder bridge were re-vealed.The results show that transverse stiffness and main girder ductility are the main factors affecting the re-dundancy 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Key words
steel-concrete composite twin I-girder bridge/system nonlinear redundancy/transfer stiffness/internal force redistribution/ductility degradation分类
建筑与水利引用本文复制引用
王晓明,邓华,张浩楠,袁通,朱传超,田鹏程,张煜博..双工字钢板组合梁桥的时变体系冗余性评估[J].东南大学学报（自然科学版）,2024,54(2):312-320,9.基金项目
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). （52178104）
