基于模态分析的预应力混凝土斜拉桁架T构桥梁损伤识别研究  

Damage Identification of Prestressed Concrete Chord-Stayed Truss T Rigid Frame Bridge Based on Curvature Modal

作　　者：张亚龙 张筱雨[2] ZHANG Ya-long;ZHANG Xiao-yu(Urban Management And Transprotation Bureau Of Qinhan New City,Bureau New City,Shaanxi 712000,China;School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China)

机构地区：[1]西咸新区城市管理和交通运输局,陕西西咸新区712000 [2]长安大学公路学院,陕西西安710064

出　　处：《黑龙江交通科技》2022年第12期107-109,共3页Communications Science and Technology Heilongjiang

摘　　要：预应力混凝土斜拉桁架T构桥梁是兼具多种桥型特点的桥梁结构形式,其桥型特殊、受力复杂。该类桥梁的损伤识别也有其特殊性,为此,通过建立有限元模型,模拟桁架杆在不同损伤程度下的模态振型,根据位移模态推导桁架在不同程度损伤下主梁的曲率模态绝对差,基于主梁的曲率模态绝对差值分析达到对桁架的损伤识别。研究结果表明,桁架损伤导致附近主梁曲率模态绝对差出现突变峰值,通过斜拉桁架T构桥主梁的曲率模态绝对差能较好对桁架损伤进行识别,主梁曲率模态绝对差对识别两侧单根杆的损伤效果优于对两侧两根杆损伤的识别效果。The prestressed concrete chord-stayed truss T rigid frame bridge is a bridge structure with many bridge types,it has special type and complex force.This kind of bridge damage identification also has its particularity,therefore,a finite element model is established to simulate the modal mode of the truss rod under different damage degree,and the curvature mode of the main beam under different degree damage is deduced according to the displacement mode,and the damage identification of the truss is achieved according to the absolute difference analysis of the curvature mode of the main beam.The results show that the truss damage leads to the mutation peak of the absolute difference of the curvature mode of the nearby main girder,and the damage of the truss is better by the absolute difference of the curvature mode of the main girder of chord-stayed truss T rigid frame bridge,and the absolute difference of the curvature mode of the main girder is better than the recognition effect of the damage of the single root rod on both sides.

关 键 词：预应力 混凝土斜拉桁架T构桥 模态 损伤 

分 类 号：U442[建筑科学—桥梁与隧道工程]