Assessment of time-varying system redundancy of steel-concrete composite twin I-girder bridge
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.
万方数据
维普
