钢筋锈蚀的配斜筋混凝土梁抗剪性能试验研究

发布时间：2018-06-13 23:47

本文选题：钢筋混凝土梁 + 抗剪性能　；参考：《桥梁建设》2017年05期

【摘要】：为了解钢筋锈蚀对配斜筋混凝土梁抗剪破坏形态和抗剪承载力的影响,设计制作14片配斜筋混凝土梁,采用电化学方法对试验梁钢筋进行快速锈蚀,达到设计锈蚀率后进行抗剪试验,分别研究仅箍筋锈蚀和全部钢筋锈蚀对试验梁抗剪破坏形态和抗剪承载力的影响,并考虑钢筋截面减少、力学性能退化及混凝土截面损伤等因素提出配斜筋混凝土梁抗剪承载力的简化计算方法。结果表明:剪跨比相同的情况下,钢筋锈蚀对试验梁的抗剪破坏形态影响不大;箍筋轻微锈蚀在一定程度上能提高梁的抗剪承载力,严重锈蚀时抗剪承载力下降较为明显;全部钢筋锈蚀时,梁的抗剪承载力随锈蚀率的增加显著减小,其下降速率比仅箍筋锈蚀时更快;提出的混凝土梁抗剪承载力计算方法具有较高的精度。
[Abstract]:In order to understand the effect of steel corrosion on shear failure mode and shear bearing capacity of reinforced concrete beams with skew reinforcement, 14 reinforced concrete beams with skew reinforcement were designed and fabricated, and rapid corrosion of test beams was carried out by electrochemical method. After the design corrosion rate is reached, shear tests are carried out. The effects of only stirrups corrosion and all reinforcement corrosion on the shear failure mode and shear bearing capacity of the test beams are studied respectively, and the reduction of the steel bar section is considered. A simplified method for calculating the shear capacity of reinforced concrete beams with skew bars is presented. The results show that under the same shear / span ratio, the corrosion of steel bar has little effect on the shear failure pattern of the test beam, and the slight corrosion of stirrups can improve the shear bearing capacity of the beam to some extent, but the shear capacity decreases obviously when the steel bar is corroded seriously. When all steel bars are corroded, the shear bearing capacity of beams decreases significantly with the increase of corrosion rate, and the decreasing rate is faster than that of only stirrups, and the proposed calculation method of shear bearing capacity of concrete beams has higher accuracy.
【作者单位】：湘潭大学土木工程与力学学院;长沙理工大学土木与建筑学院;
【基金】：国家重点基础研究发展计划(973计划)(2015CB057705) 国家自然科学基金项目(51678069,51708477) 湖南省教育厅科研项目(17C1539)~~
【分类号】：TU375.1

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