【摘要】 传统的钢筋混凝土结构的整体式模型往往难以模拟钢筋的作用效果,导致计算结果不理想。在定义材料本构关系时,充分考虑钢筋在混凝土开裂之后的作用,可在保证计算精度的同时显著提高计算效率。首先分别以建立钢筋单元和输入配筋率的两种方式建立了分离式模型和整体式模型;其次考虑混凝土强度、集配情况定义了混凝土材料的非线性应力-应变关系,特别是采用与裂缝开展有关的裂缝处剪应力与剪应变的本构关系;然后分别对两组模型进行数值计算,并从开裂强度、裂缝开展过程、监测点的位移、极限强度等多个方面分别将两组计算结果与相应试验结果进行对比,结果表明优化计算方法单元数目少,计算速度快,计算精度高;最后将该方法应用到实际工程,准确分析了钢筋混凝土柱在地震作用下的裂缝开展以及破坏过程。更多还原

【Abstract】 Traditional integral models find it is difficult to represent steel effects for reinforced concrete structures, leading to the calculation results less informative. Taking into full consideration of steel effects after crack development when define the constitutive relationship can improve the accuracy of the integral model. In this study, both separate and integral models were established. In addition, concrete strength and particle size were considered to accurately define the nonlinear constitutive relation, especially the power transmission capacity of the concrete cracks. Experimental results were used to verify the optimized method. The results were also compared with the calculation of the separate model in terms of cracking strength, crack development process, displacement of monitoring points, and ultimate strength of the structure. Results from both numerical methods match well with experimental results, and the optimized one is much faster. Finally, the optimized method was used to analyze crack development of a reinforced concrete column under earthquake with high accuracy and efficiency.更多还原