恒高温下圆钢管混凝土界面粘结性能有限元分析

Finite Element Analysis on the Bond Behaviour of Interface for Concrete-filled Round Steel Tube under Constant High Temperature

为研究恒高温下圆钢管混凝土的粘结滑移性能,采用弹簧有限元的方法,通过ABAQUS有限元软件对钢管混凝土试件进行推出试验的模拟分析,将模拟分析所得的界面粘结强度和荷载-滑移曲线与试验进行比较,结果表明模拟分析结果与试验结果吻合良好。在此基础上,探讨了恒温温度、径厚比、长细比等因素对钢管混凝土平均粘结强度的影响。结果表明,平均粘结强度受恒温温度影响显著,随恒温温度的升高先降低后升高再降低;随钢管长径比的增大而减小;平均粘结强度受径厚比影响不明显。本文的研究成果可为相关研究提供参考。

In order to study the bond behaviour of interface for concrete-filled round steel tube under constant high temperature,the spring finite element method was used to simulate the concrete filled steel tube specimens by ABAQUS finite element software to launch the test,and the interface bond strength and load-slip curves obtained from the simulation analysis were compared with the test,and the results showed that the simulation analysis results were in good agreement with the test results.On this basis,the effects of constant temperature,diameter-thickness ratio and length-thinness ratio on the average bond strength of concrete filled steel tube were investigated.The results showed that the average bond strength was significantly influenced by constant temperature,which first decreased,then increased and then decreased with the increase of constant temperature;it decreased with the increase of length-thickness ratio of steel pipe;the average bond strength was not significantly influenced by diameter-thickness ratio.The research results of this paper can provide reference for related research.