无粘结部分预应力混凝土梁非线性全过程滞回分析

Nonlinear Full Range Hysteretic Analysis on Unbonded Partially Prestressed Concrete Beams

在已完成的16根无粘结部分预应力混凝土梁低周反复荷载试验的基础上,合理地选择了各材料的本构关系模型,深入分析了无粘结部分预应力混凝土梁的受力特性,通过设置刚性短臂将无粘结预应力筋的作用等效为外荷载,综合运用'分级加变形'和'分级加荷载'的方法,提出了无粘结部分预应力混凝土梁的非线性全过程滞回分析方法,编制了MATLAB计算程序.对比试验结果与计算结果,吻合程度良好,具有一定的理论和工程意义.

Based on the tests of sixteen unbonded partially prestressed concrete beams under low cyclic reversed loading, the constitutive relations under cyclic loadings of every material were selected reasona- bly. After an in-depth analysis on the mechanical characteristics of unbonded partially prestressed concrete beams, unbonded prestress actions were converted to their equivalent loads by setting short rigid arms. Then, a nonlinear full range hysteretic analysis method for unbonded partially prestressed concrete beams was proposed by combining the step deforming method and the step loading method, and a MATLAB pro- gram was developed. Through comparisons and analyses, the calculated results coincide well with the tes- ting results. So it has theoretical and practical engineering significance.