桁架结构呼吸裂缝损伤识别算法研究  

Study on Identification Algorithm of Breathing Crack Damage in Truss Structure

作　　者：徐训 操汉雄 徐波[1] XU Xun;CAO Han-ciong;XU Bo(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572024,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉理工大学三亚科教创新园,三亚572024

出　　处：《武汉理工大学学报》2024年第10期52-58,共7页Journal of Wuhan University of Technology

基　　金：国家自然科学青年基金(51708435)。

摘　　要：针对含有呼吸裂缝的桁架结构,提出了一种高精度局部损伤识别方法。将带裂缝构件进行有限元模拟,以损伤桁架构件拉伸刚度的折减作为损伤因子,损伤构件内力用未知荷载替代,建立双线性呼吸裂缝动力平衡方程。采用积分方程荷载识别方法,识别损伤构件内力,从而求出构件损伤因子。数值算例表明,不同激励下损伤识别效果均表现良好,其中谐波荷载作用下识别的精度最高;虚位移函数选取三角函数或者指数函数时,算法的识别精度最好。For truss structures with breathing cracks,a high-precision local damage identification method was proposed.The finite element simulation of cracked members was carried out,and the reduction of tensile stiffness of damaged truss members was taken as the damage factor.The internal force of damaged members was replaced by unknown load.The bilinear dynamic equilibrium equation of breathing cracks was established.The integral equation load identification method was used to identify the internal force of the damaged member,so as to calculate the damage factor of the member.The results show that the damage identification effect under different excitation is good,and the identification accuracy under harmonic load is the highest.When trigonometric function or exponential function is selected as virtual displacement function,the recognition accuracy of the algorithm is the best.

关 键 词：损伤识别 桁架结构 双线性呼吸裂缝 虚功原理 

分 类 号：TU317[建筑科学—结构工程]