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箍筋锈蚀的配斜筋混凝土梁抗剪试验

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Keywords: 桥梁工程,配斜筋梁,静载试验,箍筋锈蚀,抗剪性能,有限元分析

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Abstract:

?为研究箍筋锈蚀对配斜筋混凝土梁抗剪性能的影响,通过外加恒电流法加速钢筋锈蚀,进行了6根锈蚀梁和1根无锈蚀梁的抗剪试验,分析了相同剪跨比下箍筋锈蚀对其破坏形态、斜裂缝开展、挠度、钢筋受力及抗剪承载力等方面的影响。试验结果表明:在剪跨比为1.75的情况下,箍筋锈蚀和斜筋的存在对试验梁破坏形态影响较小,但随着锈蚀率的增加,弯剪斜裂缝数量减少,延伸长度变短;箍筋锈蚀引起的混凝土截面损伤对斜裂缝宽度开展、挠度及斜向开裂荷载均有显著影响;箍筋锈蚀对斜筋受力有较大影响,随着锈蚀程度的增加,斜筋承担的剪力相应提高;当箍筋锈蚀率小于7%时,试验梁抗剪承载力略有提高;在箍筋锈蚀率大于11%以后,配斜筋梁抗剪承载力下降幅度明显小于无斜筋梁;锈蚀梁的抗剪承载力有限元数值模拟结果与试验结果较为吻合。

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