既有锈蚀RC梁剩余抗剪承载力试验

为了准确评估锈蚀RC梁的剩余抗剪承载力,在对6根既有纵筋、箍筋锈蚀都比较严重的混凝土抗弯构件进行了剩余抗剪承力试验研究的基础上,提出了锈蚀RC梁的剩余抗剪承载力计算公式.结果表明,既有锈蚀RC梁挠度曲线没有明显的开裂拐点;破坏时脆性明显,裂缝集中在某一处,间距较大,破坏荷载和屈服荷载接近,受剪破坏形态可能表现为加载点下垂直裂缝引起的破坏.所提出的既有锈蚀RC梁剩余抗剪承载力计算公式与试验结果吻合较好,可为锈蚀RC梁剩余抗剪承载力评估提供一定参考.

Experimental study on residual shear capacity of existing corroded RC beams

The corroded RC beams are often found in engineering practice. How to evaluate the resi-dual shear capacity of corroded RC beam remains to be a very important problem in the detection and evaluation of structure which is in great need of solution. The residual shear capacity experiment with 6 corroded RC beams was conducted. The datum of experiments was analyzed and compared with those of uncorroded RC beam and the formula of existing corroded RC beam′s residual shear capacity was put forward. The result of experiment and analysis shows that there are obvious differences between the shear behavior of corroded RC beam and uncorroded RC beam. Compared with uncorroded RC beam, the shear capacity of corroded RC beams reduces obviously, ductility weakens, and the ultimate load is close to yielding load. The formula can be used in engineering practice.