Damage identification and load transfer capacity evaluation for transverse connection of beam bridges based on modal tests
The advantages and disadvantages of the transverse connection of beam bridges are related to the structural stability and bearing condition.To scientifically and accurately identify the damage location and evaluate the load transfer capacity of transverse connection members of beam bridges,a 16-m span simply-supported hollow slab beam bridge in the actual project was studied in this paper.A damage identification method of transverse connection based on the trans-verse change rate ratio of mid-span modal modes of the main beam and the modal deflection difference between adjacent main beams was proposed.Through a finite element simulation analy-sis,the validity of the damage identification indexes were verified,and the reduction factor ζ of transverse load transfer performance was defined to evaluate the load transfer capacity of trans-verse connection.The results show that the damage location of hinge joints can be determined using the position where the transverse change rate ratio of the first-order modal mode is increased.Based on the sudden change of the modal deflection difference between adjacent beams,the hinge joint damage location can also be accurately identified.ζ is the most significant index to judge the transverse connection of bridge.The load transfer capacity of transverse connection is decreased with the increase in the value of ζ.Therefore,the reduction factor ζ based on modal tests can be used as a reliable index to evaluate the transverse load transfer capacity of hinge joints.The research results can provide a useful reference for the detection and evaluation of the transverse connection safety of simply-supported beam bridges.
万方数据
维普
