疲劳荷载-环境耦合作用下钢筋混凝土梁锈裂数值模拟  

Numerical simulation of rust cracking of reinforced concrete beams under coupled effect of fatigue loading and environment

作　　者：陈坚 徐亦冬[2] 杜坤[2,3] 方建柯 陈坚钢 潘志宏[1] CHEN Jian;XU Yidong;DU Kun;FANG Jianke;CHEN Jiangang;PAN Zhihong(School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Civil Engineering and Architecture,Zhejiang University Ningbo Institute of Technology,Ningbo 315100,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Ningbo Gu te Concrete Co.,Ltd.,Ningbo 315111,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212003 [2]浙江大学宁波理工学院土木建筑工程学院,浙江宁波315100 [3]重庆交通大学土木工程学院,重庆400074 [4]宁波固特砼混凝土有限公司,浙江宁波315111

出　　处：《混凝土》2020年第2期21-24,共4页Concrete

基　　金：国家自然科学基金(51778577)。

摘　　要：为研究疲劳荷载-环境耦合作用下钢筋混凝土梁锈裂损伤情况,基于有限元软件ABAQUS建立混凝土塑性损伤模型,利用钢筋受热膨胀模拟钢筋非均匀锈胀荷载,同时在模型上施加同步的疲劳荷载,实现疲劳荷载-锈胀荷载的耦合作用,模拟耦合作用下钢筋混凝土梁的损伤情况。结果表明:钢筋混凝土梁在跨中部位损伤最严重,有着自下而上、自跨中到两边的传播趋势;相比单独锈胀力的施加,耦合作用引起的损伤要更为严重,分别增加了76%和100%。It is aimed to investigate the rust crack damage of reinforced concrete beams under coupled effect of fatigue loading and environment.Based on the finite element software ABAQUS,the concrete plastic damage model is established,and the non-uniform rust expansion load of the steel bar is simulated by the thermal expansion of the steel bar.At the same time,synchronous fatigue loads are applied to the model to realize the coupling of fatigue load and rust expansion force,and the damage of reinforced concrete beams under simulated coupling is simulated.The results show that the reinforced concrete beam has the most serious damage in the mid-span area,and it has a tendency to spread from the bottom to the top and from the middle to the two sides.Compared with the application of rust expansion force alone,the damage caused by coupling is more serious,increasing by 76% and 100% respectively.

关 键 词：钢筋混凝土梁 疲劳 锈胀开裂 ABAQUS 

分 类 号：TU528.571[建筑科学—建筑技术科学]