基于挠度差值影响线的简支梁桥损伤识别研究

Study on Damage Identification of the Beam Bridge Based on the Difference of Deflection Influence Line

推导了简支梁某一点的挠度随移动荷载位置变化的解析解,在理论上证明了挠度差值影响线对结构损伤识别的可行性.提出用损伤前后一点的挠度差值来识别损伤,为验证该方法的正确性,采用一个单跨简支梁进行有限元模拟.通过有限元计算表明该方法对单损伤简支梁的损伤位置和损伤程度具有准确的识别能力.

The analytical solution of one point s deflection changed with moving load location is derived at first.It verifies the feasibility of deflection difference influence line on the damage identification of structures.A method by using deflection difference before and after damage is used to identify structure damage.A simply-supported beam example is adopted to verify the proposed method.It is shown that the method is effective in identifying damage locations and degrees.