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基于6根箱形型钢混凝土构件纯扭试验结果,利用非线性有限元软件ABAQUS建立模型,对其受力全过程进行数值模拟,考虑型钢和混凝土之间的相互作用。对混凝土、钢筋和型钢的应力随荷载变化的规律进行分析。有限元计算结果表明:ABAQUS对纯扭构件混凝土裂缝发展情况能较好地模拟;由于箱形型钢的抗扭刚度较大,混凝土开裂时型钢截面内剪力流形成的扭矩不能忽略;模拟得到构件的开裂扭矩、极限扭矩以及扭矩-扭率关系曲线与试验结果吻合较好,验证了所建模型分析型钢混凝土梁受扭全过程分析方法的可行性。
Based on the pure torsion test results of six steel reinforced concrete box members, the nonlinear finite element software ABAQUS was used to establish the model and carry out numerical simulation of the whole process of the stress. The interaction between steel and concrete was considered. The stress of concrete, steel bar and steel is analyzed with the change of load. The results of finite element analysis show that ABAQUS can simulate the development of concrete with pure torsion. The torsional stiffness of the section steel can not be neglected due to the high torsional stiffness of the box-shaped steel. The curves of cracking torque, ultimate torque and torque-torsion are in good agreement with the experimental results, which verifies the feasibility of the analytical method of the whole torsional torsion of the model steel beam.