能量耗散模拟分析预应力混凝土梁疲劳寿命  

Energy dissipation simulation analysis of fatigue life of pre-stressed concrete beams

作　　者：邹兰林[1] 吴康 周兴林[1] 吴耀辉 ZOU Lan-lin;WU Kang;ZHOU Xing-lin;WU Yao-hui(School of Automobile and Traffic Engineering,Wuhan University of Science and Technology,Wuhan 430051,China)

机构地区：[1]武汉科技大学汽车与交通工程学院,武汉430051

出　　处：《沈阳工业大学学报》2022年第1期116-120,共5页Journal of Shenyang University of Technology

基　　金：国家自然科学基金面上项目(51778509,51578430).

摘　　要：为了准确预测预应力钢筋混凝土梁疲劳寿命,提出了一种基于能量耗散理论预测预应力钢筋混凝土梁疲劳寿命的方法.利用ANSYS软件,针对5片不同动态预应力度的预应力钢筋混凝土梁进行了疲劳模拟,采用分段线性拟合模型模拟并分析了循环比和耗散能密度之间的关系.研究结果表明:预应力混凝土梁在循环荷载作用下,耗散能密度的变化呈现明显的“三阶段”变化规律;动态预应力度低的混凝土梁,在疲劳开始阶段耗散能密度衰减更加迅速且更快到达疲劳稳定阶段,且疲劳稳定阶段持续时间更长.In order to accurately predict the fatigue life of pre-stressed reinforced-concrete beams,a method based on energy dissipation theory to predict the fatigue life of pre-stressed reinforced-concrete beams was proposed.By using ANSYS software,fatigue simulations were carried out for 5 pieces of pre-stressed reinforced-concrete beams subjected to different dynamic pre-stressing degrees.A piecewise linear fitting model was used to simulate and analyze the relationship between cycle ratio and dissipated energy density.The results show that the variation of dissipated energy density of pre-stressed concrete beams under cyclic loadings clearly exhibits a“three-stage”change rule.The concrete beam with lower dynamic pre-stress presents a faster decay of dissipated energy density at the beginning of fatigue and reaches the fatigue stabilization stage faster,and the duration of this stage lasts much longer as well.

关 键 词：预应力钢筋混凝土梁 能量耗散 疲劳寿命 有限元 预应力度 循环比 耗散能密度 线性拟合 

分 类 号：TU375.4[建筑科学—结构工程]