摘要
利用结构振动波传播理论,将含裂纹混凝土梁以裂纹为界划分为两段连续的波导体,为了表征由裂纹引起的梁中波传播的不连续特性,引入了模拟裂纹的弯曲弹簧模型。通过理论计算得到了裂纹简支梁的特征方程,并以一裂纹混凝土简支梁为例进行数值分析,讨论了裂纹的深度和位置对裂纹梁各阶固有频率的影响。
Based on vibration wave propagation theory, a concrete beam is divided into two separate segments by a crack. To characterize the local discontinuity on account of the crack, a bending spring model is proposed to model the crack. The characteristic equation of a simple supported cracked beam is deduced, and a numerical analysis is implemented, the effects of the depth and location of the crack on natural frequencies of cracked beam are discussed.
出处
《世界地震工程》
CSCD
北大核心
2006年第1期45-48,共4页
World Earthquake Engineering
基金
国家自然科学基金资助项目(编号
50378041)
教育部优秀青年教师资助计划资助项目(2004)
关键词
波传播
弯曲弹簧模型
裂纹梁
频率
wave propagation
bending spring model
cracked beam
angular frequency
