UHPC加固RC结构交界面抗剪性能试验研究

发布时间：2018-01-30 00:57

本文关键词： 桥梁工程抗剪加固推出试验 UHPC 承载力抗裂性荷载-滑移曲线　出处：《中外公路》2017年02期 　论文类型：期刊论文

【摘要】：UHPC具有超高强度、耐久性好、韧性高等特性,加固老旧钢筋混凝土(RC)结构可大幅提高其抗裂、防水及耐久性能,而现浇UHPC与原混凝土的交界面抗剪性能是加固安全性能的关键。为研究加固构件交界面的抗剪性能,设计4组构件,分别为界面不处理(GH-C50组)、界面凿毛处理(ZM-C30组、ZM-C50组)、界面植筋处理(ZJ-C50组),然后对现浇UHPC加固并进行推出试验。试验结果表明:UHPC加固RC结构其交界面抗剪强度高、耐久性好,未发生收缩开裂等病害;构件破坏形式,在ZM组中为界面剪切破坏,在GHC50组、ZJ-C50组中为普通混凝土受剪破坏;对构件进行植筋处理,有助于提高构件的稳定性及延性,其滑移距离相比GH构件得到极大提高;ZM-C30、ZM-C50、GH-C50、ZJ-C50构件的抗剪强度分别为同等级普通混凝土抗剪强度的47.1%、57.9%、44.4%、70.5%,这可为加固构件界面抗剪强度计算提供参考依据。
[Abstract]:UHPC has the characteristics of super high strength, good durability and high toughness. Strengthening the old reinforced concrete (RC) structure can greatly improve its crack resistance, waterproofing and durability. The shear behavior of the interface between cast-in-place UHPC and the original concrete is the key to strengthen the safety performance. In order to study the shear behavior of the interface of the strengthened members, four groups of members are designed. GH-C50 group, ZM-C30 group, ZJ-C50 group and ZJ-C50 group, respectively. The test results show that the RC structure strengthened by UHPC has high interfacial shear strength, good durability and no shrinkage cracking. The failure form of members is interface shear failure in ZM group and normal concrete in GHC50 group ZJ-C50 group. The stability and ductility of the components can be improved by the reinforcement planting, and the slip distance is much higher than that of GH members. The shear strength of ZM-C30 / ZM-C50 GH-C50 / ZJ-C50 member is 47.4% of that of ordinary concrete of the same grade. 70.5, which can provide reference for the calculation of shear strength at the interface of reinforced members.
【作者单位】：湖南大学风工程与桥梁工程湖南省重点实验室;
【基金】：国家自然科学基金资助项目(编号:51578226)
【分类号】：U445.72
【正文快照】： 中国危桥数量不断增加,对其进行合理的加固与维修,可以延长结构的使用寿命,避免桥梁破坏所带来的灾害,从而取得良好的经济、社会效益。传统的加固方法有:增大截面法、外包钢板加固法、改变结构受力体系法、黏贴碳纤维布等。但这些方法均存在一定的局限与缺陷,如增大截面法,增

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