有损伤连续梁的瞬态响应  

Transient response of a damaged continuous beam

作　　者：余云燕[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《爆炸与冲击》2009年第1期61-66,共6页Explosion and Shock Waves

基　　金：甘肃省自然科学基金项目(3ZS061-A25-042);兰州交通大学"青蓝"人才工程基金项目(QL0507A)

摘　　要：出于局部控制和健康安全监测的需要,为检测结构的损伤提供可能性,应用回传射线矩阵法,对方波脉冲作用下的有损伤连续梁进行损伤检测研究。连续梁结构的局部损伤用减小单元的杨氏模量来模拟。结果表明,当方波脉冲斜向作用时,通过结构上接收点处轴向速度波能准确判断损伤存在,确定损伤区域,估测损伤程度。While elastic waves propagates along structures, all kinds of information can be carried, including damage information, which offers possibility for detection of damaged structures. For the sake of carrying on local control and health safety monitoring, a damaged continuous beam by applying square pulses was investigated by the reverberation-ray matrix method. The local damage in the continuous beam was modeled by the decreased Young＇s modulus. Researched results show that while the square pulse is applied obliquely, the axial velocity wave at the receiving point can be detected, the detected velocity wave can be used to locate the damage position and to estimate the damage degree.

关 键 词：固体力学 瞬态响应 回传射线矩阵法 连续梁 损伤检测 速度波 

分 类 号：O343[理学—固体力学]