摘要
为得到火灾后钢筋混凝土简支梁动力特性用于识别其损伤,本文基于厚板积分理论提出火灾后以刚度为转换变量的梁自由振动方程,并考虑了弹性模量改变,中性轴上移及配筋率对其产生的影响。然后提出以频率为识别指纹对梁损伤后的位置及程度进行识别的新方法。最后结合梁的火灾试验及动力试验验证了理论的正确性。
In order to obtain the dynamic characteristics of reinforced concrete simply supported beam after fire,which used to identify its damage. Based on the theory of thick plate integral,the free vibration equation of a beam with stiffness as transformation variable was presented after fire in this paper. And the influence of the change of elastic modulus,the shift of the neutral axis and the ratio of reinforcement on it were considered. Then a new method of identifying the position and degree of the damage of the beam by frequency was proposed. Finally,the correctness of the theory was verified by the fire test and dynamic test of the beam.
作者
高立堂
许盼让
褚桂勋
GAO Litang,XU Panrang, CHU Guixun(Qingdao University of Technology, Qingdao 266033 , Chin)
出处
《四川建筑科学研究》
2018年第4期6-12,共7页
Sichuan Building Science
关键词
简支梁
火灾损伤识别
动力特性
频率折算高度
simple supported beam
fire damage identification
dynanlic characteristics
frequency converted height
