In order to study the influence of different damage modes on the lateral mechanical properties of the prefabricated T-beam bridge,the reliability of the finite element model is verified based on the theoretical calculation of the comparative orthotropic plate method.The lateral force model of the main beam damage is established through the rigidly connected beam method..Based on the possible dam-age forms and damage locations of the existing prefabricated T-beam bridge,different damage models are established,and the changes in the transverse distribution coefficient are analyzed after the bridge is damaged.The results show that when the bridge diaphragm is intact,the damage to the flange plate has a small impact on the lateral stiffness of the bridge.When the bridge flange plate is intact,the dam-age to the diaphragm has a significant impact on the lateral stiffness of the bridge.The degree of dam-age to lateral connections has less impact on distant bridges.When only a single main beam is dam-aged,the vertical value of the influence line of the damaged beam decreases,while the vertical value of the influence line of the surrounding intact beams increases.In the case of damage to multiple main beams,the overall trend is similar to that of the damage to a single main beam,but the degree of dam-age is more significant.
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