论文部分内容阅读
介绍了关于混凝土材料本构关系的von Mises,Mohr Coulomb,Drucker Prager,Smeared Cracking和Damaged Plasticity模型,采用这五种材料模型分别对带约束拉杆矩形钢管混凝土(CFT)轴压短柱进行有限元分析,并与试验结果对比。分析表明:采用Damaged Plasticity模型得到的轴压承载力及残余荷载高于von Mises,Mohr Coulomb与Smeared Cracking模型的计算结果,仅低于Drucker Prager模型的计算结果。Damaged Plasticity模型考虑混凝土双轴等压强度,在静水压力下极限强度能适当提高,且采用非相关流动法则,能合理考虑混凝土的塑性体积膨胀,因而能引起钢管及拉杆的约束作用,其计算结果较其它四种模型合理,相对于试验结果较接近,但与试验结果仍有差距。
The von Mises, Mohr Coulomb, Drucker Prager, Smeared Cracking and Damaged Plasticity models for the constitutive relationship of concrete materials are introduced. The five models are used to analyze the finite element analysis of rectangular concrete-filled steel tubular (CFT) , And compared with the test results. The analysis shows that the calculated bearing capacity and residual load obtained by Damaged Plasticity model are higher than that of von Mises, Mohr Coulomb and Smeared Cracking models, which is only lower than that of Drucker Prager model. Damaged Plasticity model considering the biaxial compressive strength of concrete, the ultimate strength under hydrostatic pressure can be appropriately increased, and using the non-related flow law can reasonably consider the plastic volume expansion of concrete, which can cause the constraint of the steel pipe and tie rod, the calculation results More reasonable than the other four models, relative to the test results are close, but the test results are still gaps.