作　　者： ; ; ;

机构地区： 教育部

出　　处： 《桥梁建设》 2009年第4期80-83,共4页

摘　　要： 推导简支梁某一点的挠度随移动荷载位置变化的函数,在理论上证明利用挠度差值影响线进行结构损伤识别的可行性。提出利用损伤前、后某一点的挠度差值影响线曲率来识别损伤的方法,即当移动荷载位于无损区域时,挠度差值影响线曲率为0,当移动荷载位于有损区域时,挠度差值影响线曲率明显增大,且与损伤点的位置、损伤前后的刚度有关。为验证该方法的正确性,采用一个单跨简支梁算例进行有限元模拟,算例表明该方法不但适用于单处损伤的情况,而且适用于多处损伤情况,且对结构的损伤位置和损伤程度都具有准确的识别能力。 The function of deflection at a certain point on a simply-supported beam bridge changing with the moving load positions is derived and the feasibility of the structural damage identification by the influence line of deflection differential values is theoretically proved. A method for identifying the damage, using the influence line curvature of deflection differential values at a point before and after the damage is proposed, that is, when the moving load is in the area without the damage, the influence line curvature is zero, however when the moving load is in the area with the damage, the influence line curvature evidently increases and has the relationship with the positions of the damage points and the rigidity of the beam before and after the damage. To verify the correctness of the method, the calculation example of a single-span simply-supported beam bridge is used to conduct the finite element simulation. The calculation shows that the method is not only applicable to the single-point, but also the multi-point damage identification and moreover, the method has the correct ability to identify both the positions and degrees of the structural damage.

关 键 词： 结构损伤 识别 健康监测 有限元法 挠度影响线 曲率

领　　域： [建筑科学] [交通运输工程] [建筑科学] [交通运输工程]