根据荷载横向分布系数和虚功原理,推导出了影响线挠度差影响线和挠度差二阶导数的解析解用于简支T型梁桥的损伤识别。为验证推论的合理性,利用梁格法模拟建立了一座横向由六片T梁组成的简支梁桥,并对其中三片梁的损伤进行了识别研究。 According to the transverse distribution coefficient and the principle of virtual work load, analytical solutions that affect the second derivative of influence line of line deflection difference and deflection difference are deduced for the damage identification of simply supported T-shaped bridge. In order to verify the rationality of the corollary, a simple supported girder bridge composed of six T-beams was established by using the beam-grid method. The damage of three beams was identified.