预应力型钢混凝土框架结构非线性分析

NON-LINEAR ANALYSIS OF PRESTRESSED STEEL-CONCRETE COMPOSITE FRAMES

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 test of two large-scaled PSRC frames,nonlinear analysis is carried out for two tested prestressed steel-concrete frames using finite element ABAQUS.Numerical simulation results and test results are compared.Results show that the nonlinear analysis can simulate exactly the whole process of the test for this kind of structure.Both test results and numerical simulation results indicate that the amplitude modulation value of support moment increases as the degree of prestressing of the PSCF increases when depth of compression zone remains invariant;when the degree of the prestress remains constant,it decreases when depth of compression zone increases.The amplitude modulation value of support moment decreases when effective prestress increases.