荷载场和氯离子扩散场共同作用下的钢筋混凝土构件分析

摘要

为讨论荷载场与氯离子扩散场的共同作用,引入考虑荷载作用下的混凝土损伤影响函数Fd,采用ABAQUS有限元软件的USDFLD子程序开发功能,在内置的Mass Diffusion模块中考虑荷载作用和力学损伤对氯离子扩散的影响,实现钢筋混凝土构件层次荷载场和氯离子扩散场的多物理场共同作用分析.结果表明:有限元计算结果和试验结果吻合良好;随着荷载比的增大,氯离子在混凝土中的扩散速度逐渐加快,且拉应力对氯离子扩散的促进作用远大于压应力.为探究氯离子在混凝土中的扩散规律提供了一种新方法.%In order to discuss chloride diffusion due to flexural load in concrete,the influence function of concrete damage Fd under consideration of flexural load is introduced and the test data is compared with ABAQUS analysis results,in which,a subroutine based on USDFLD in the Mass Diffusion module in ABAQUS is developed to take the fiexural load and mechanical damage into account.Consequently,multi-physics combined analysis of chloride diffusion due to flexural load on reinforced concrete member is achieved.The results indicate that finite element analysis has a good agreement with tests results.With the increase of load ratio,chloride diffusivity in concrete is accelerated.Furthermore,the promoting effect of tensile stress on chloride diffusion is much greater than that of compressive stress.A new method to study chloride diffusion in concrete is provided in this paper.