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钢筋混凝土梁的损伤模拟的重难点在于描述两种材料非线性的本构关系以及钢筋混凝土粘结滑移关系非线性,然而合理准确地模拟钢筋混凝土的组合结构的受力变化对于研究结构的稳定性具有重要的意义.论文采用单弹簧联结单元法模拟钢筋和混凝土相互作用,不仅使得钢筋混凝土法向不发生渗透,提高了计算的收敛性而且适用于钢筋任意布置的形式;结合适用于多轴应力状态下的混凝土四参数损伤模型,模拟了钢筋混凝土结构从开始加载到结构破坏的全过程,细致地描述了钢筋混凝土梁受力过程中截面内力和位移的变化情况,以及因混凝土材料破坏造成的构件承载力下降等现象.三点弯曲梁和四点弯曲梁损伤的数值算例体现了该方法的有效性,该方法具有重要的工程实践意义.
The most difficult and difficult point of the damage simulation of RC beams is to describe the nonlinear constitutive relationship of the two materials and the nonlinear relationship of the bond-slip of RC beams. However, it is reasonable and accurate to simulate the change of the force of the RC structure in order to study the stability of the structure Which is of great importance.The paper simulates the interaction between steel bar and concrete by the single-spring coupling element method, which not only makes the normal direction of reinforced concrete not infiltrated, but also improves the convergence of calculation and is suitable for any form of steel bars. Stress model of four-parameter damage model to simulate the entire process of loading reinforced concrete structures from the beginning to the structure damage, detailed description of the reinforced concrete beams during the cross-section of the force and displacement changes, as well as the concrete material damage caused by the components The bearing capacity is reduced and so on.The numerical example of the damage of three-point bending beam and four-point bending beam shows the effectiveness of the method, and the method has important practical significance.