基于多孔介质理论的混凝土徐变力学行为的有限元分析

水分是影响混凝土徐变的最重要因素之一,但通常为了计算的简便往往忽略了水分的影响,造成计算结果有很大的误差.文章根据混合物理论结合罚参数法、Galerkin加权残值法以及徐变应力分析的隐式解法,推导得到了混凝土徐变两相多孔介质模型.建立了有限元计算模型,给出了求解算法并编制了有限元程序.计算和试验比较分析表明,该理论和计算方法得到的结果遵循徐变相关性质,说明了该理论和计算模型的合理性.最后,指出了模型中存在的不足以及进一步的研究方向.

FINITE ELEMENT ANALYSIS OF MECHANICAL BEHAVIORS OF CONCRETE CREEP BASED ON THE POROUS MEDIA THEORY

Water is the most important factors affecting concrete creep,but it is often neglected in order to simplify analysis,which may results in some error. In this paper,the model of concrete creep is established based on the mixtures theories,the penalty-function parameters method,the Galerkin weighted residual method and the implicit method. Taking advantage of the above mentioned formulations, a finite element model is attained and the corresponding code is produced. Comparative analysis between the calculation and the test result show that the theory and the model are reasonable. Finally,deficiencies in the model and further research are analyzed in detail.