摘要
桥梁结构的损伤识别结果,可作为维修加固设计的依据。以龙母大桥为工程背景,提出一种识别刚架拱桥损伤的方法。即先建立空间梁单元模型,计算桥梁的竖弯振型。使用总体模型保证准则初步确定刚架拱桥的损伤位置,列出几种可能的损伤情况,并将其柔度与实测振型计算出的柔度相减,若柔度差接近0,则为最有可能的损伤情况。结果表明:合理制定测试方案和准确测试前三阶竖弯振型,是刚架拱桥损伤定位的关键。
The results of damage identification can be applied to design of bridge structure strengthening. A damage identification approach of rigid-frame arch bridge is deal with taking Longmu Bridge as engineering background. Space beam model is set up to calculate vertical model shapes of bridge structure. The Total Modal Assurance Criterion （TMAC） is used to determine structural damage, and some likely damage cases are given. The ones that are most likely damage case are confirmed when the flexibility change between experimental mode shapes and mode shapes of assumed damage model accords with zero. The results show damage localization of rigid-frame arch bridge can be determined depend on reasonable measurement schemes and the accuracy of the test results of the first three vertical model shapes.
出处
《科学技术与工程》
2009年第11期2992-2998,共7页
Science Technology and Engineering
关键词
刚架拱桥
柔度矩阵
总体模型保证准则
rigid-frame arch bridge flexibility matrix total modal assurance criterion
