摘要
弯桥较直梁桥具有更复杂的变形以及受力特性,而针对其局部损伤识别的研究相对较少。位移影响线可以反映某一点的位移变化规律,在实际工程中可以直接测得。以弯桥位移影响线公式为依据,用梁格法建立了以某曲线匝道桥为工程背景的有限元模型,用数值方法分析了不同位置、不同程度损伤与竖向位移测量值之间的关系。结果表明,弯桥在局部损伤下的竖向位移影响线二阶导数可以识别局部损伤的位置与程度,可试用于实际工程。
As compared with straight beam bridges,curved bridges have more complicated deformations and mechanical behaviors. There are less researches on local damage identification of curved girder bridges. The influence line of displacement is the reflection of the structural displacement's regular under moving load. It can be measured directly. According to the theories of influence line of displacement,a finite element model of a curved ramp bridge is presented using grillage method. The paper analyzes the relationship among different position,different degree of damage and displacement measured value by using a numerical method. The results show that the second-order derivative of the vertical displacement influence line of the curved bridge with local damage has a good recognition effect,which not only identifies the damage position,but also identifies the degree of the damage. This method can be applied to practical engineering.
出处
《工业建筑》
CSCD
北大核心
2014年第S1期534-537,539,共5页
Industrial Construction
关键词
弯桥
位移影响线
位移测量值
损伤识别
梁格法
curved girder bridges
influence line of displacement
displacement measured value
damage identification
grillage method
