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基于2榀大尺寸的预应力型钢混凝土框架的试验研究,利用通用有限元程序对预应力型钢框架试验进行非线性有限元分析,并将数值模拟结果与试验结果进行对比。结果表明,非线性分析可以较为准确地模拟试验的全过程。最后,对不同预应力度及不同相对受压区高度情况下预应力型钢框架极限状态时的内力重分布做了研究。试验结果与有限元结果均表明,在受压区高度不变的情况下,随着预应力度的增大,支座弯矩的调幅值增大。在预应力度不变时支座弯矩的调幅值随着相对受压区高度的增大而减小,有效预应力的增大会降低支座弯矩的调幅值。
Based on the experimental study of 2 榀 large prestressed steel reinforced concrete frame, the finite element method is used to conduct the nonlinear finite element analysis of the prestressed steel frame test, and the numerical simulation results are compared with the experimental results. The results show that the nonlinear analysis can simulate the whole process of the experiment more accurately. Finally, the redistribution of internal forces of the prestressed steel frame under the condition of different prestressing force and different relative compressive zone height was studied. The experimental results and finite element results show that the amplitude of bearing moment increases with the increase of prestressing force under the condition of constant height of compression zone. When the prestressing force is constant, the amplitude of bearing moment decreases with the increase of the relative compression zone height. The increase of effective prestress will reduce the amplitude of bearing moment.