无粘结部分预应力混凝土梁非线性全过程滞回分析

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.

Nonlinear Full Range Hysteretic Analysis on Unbonded Partially Prestressed Concrete Beams

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 reasonably. 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 program was developed. Through comparisons and analyses, the calculated results coincide well with the testing results. So it has theoretical and practical engineering significance.