应变模态在检测桥梁钢筋损伤中的性能研究

Study on the strain modal's performance in damage detection of steel bars in bridges

在用大型有限元分析软件ANSYS建立钢筋混凝土单跨简支梁实体模型的基础上,通过对混凝土中的钢筋在单一位置,不同位置相同损伤程度,不同位置不同损伤程度的多种损伤工况下,进行了全面的数值仿真模拟,对应变模态在钢筋混凝土桥梁检测中对钢筋损伤定位及相对损伤标定方面的性能进行全面的研究测试.研究结果表明,应变模态对梁底受拉钢筋的腐蚀损伤具有良好的敏感性,能准确地标定损伤的位置及相对损伤程度.

This paper bases on a solid model of steel concrete single-span beam which created by finite element analysis software ANSYS. The overall numeric simulations were been done. These simulations include the damage elements in the middle of the steel bars, different damages in the same position of the steel bars and different damages in the different positions of the steel bars. The performance of the strain modal which is used to detect damages in the steel bars was overall studied. The results of the studies show that the strain modal has good sensibility in detecting the damages in steel bars of single-span beam and it can accurately calibrate the damage＇s position and relative damage degrees.