钢筋受压黏结滑移模型

Compressive bond slip model of reinforcing bars

为研究钢筋的受压黏结滑移关系,采用分辨率较高的激光位移计,对一批短锚长试件进行系列推出试验研究,得到精确度较高的黏结滑移值及完整的试验黏结滑移关系曲线,描述钢筋在混凝土中的受压黏结滑移破坏全过程:弹性阶段、局部滑移阶段、滑移上升段、滑移下降段和残余段。在对试验得到的较短锚长试件推出试验结果分析的基础上,经统计回归和分析,提出钢筋的受压黏结滑移曲线模型,并与试验结果进行对比。

In order to investigate the bond slip relationship of reinforcing bars under compressive condition,a series of push out tests of the specimens with short anchorage length were done using the Laser Displacement Sensor with high precision.The precise bond slip values and whole bond slip curves were gained from the tests.According to the test results,the failure process for the compressive bond slip of the bar in concrete was described in details,which can be divided into five stages： elastic stage,slip stage in some part,slip in ascent stage,slip in descent stage and remnant stage.After that,the model for compressive bond-slip relationship of reinforcing steels in concrete was proposed by statistical regression and analysis of the test results.Additionally,the comparison between the fitting curves and test curves were made.