湿式外包钢加固钢筋混凝土柱滞回模拟与参数化分析研究

Numerical Simulation Analysis on Hysteresis Performance of RC Columns Strengthened by Steel Caging

本文通过有限元软件ABAQUS中纤维梁单元的应用,并引入本文修改后的约束混凝土本构模型,模拟湿式外包钢加固混凝土柱的滞回性能,并与试验结果对比,验证有限元模型的合理性。对比发现有限元结果与试验数据吻合较好。钢筋混凝土柱在加固后的侧向承载能力和延性有较大程度的提高,加固后钢筋混凝土柱的滞回环饱满,耗能性能良好。此外,通过采用9组正交试验设计和15组参数对照试验,对影响外包钢加固柱的4个参数进行对比,得到两个主要的结论:其一,L型角钢尺寸的增大对加固后钢筋混凝土柱侧向承载能力的提高最为明显;其二,柱的轴压比对加固后的钢筋混凝土柱的延性提高最为明显。最后给出各参数的建议取值,为工程实践提供参考。

In this paper,based on application of the fiber element mode of ABAQUS and the confined concrete mode modified by the author,the results of hysteresis performance of RC columns strengthened by steel caging and the experiments are compared,and the rationality of the FE model is verified. It founds that the finite element results are in good agreement with experiment. It shows that the bearing capacities of lateral force and the ductility are increased to a large extent and hysteresis loop is plump after strengthened the RC columns,which means it has the good performance of energy dissipation. Furthermore,through 9 sets of orthogonal tests and 15 sets of parameters contrast tests,the influences of 4 parameters of the strengthened RC columns are compared,and two main conclusions are obtained： firstly,increasing size of L type iron improve the columns＇ lateral bearing capacity significantly; secondly,the column axial compression ratio could improve the columns ＇ ductility significantly.Finally the suggested values of parameters are given,providing a reference for engineering practice.