新型桥面板接缝轴拉强度设计研究

传统的混凝土桥面板湿接缝存在现场钢筋焊接、混凝土浇筑量大的问题,随着桥梁快速化施工技术的发展,一种新型的桥面板连接方式进入工程视野,即钢筋不焊接、环形钢筋交错布置的窄缝连接.现通过对国内外的理论研究,发现了此种新型接缝包含钢筋屈服与核心混凝土破碎两种破坏模式.在理论工作的基础上,给出了接缝在轴心受拉作用下的试验结果.对基于理论公式的计算与试验结果进行了比较论证,分析了不同构造参数对接缝强度的影响,同时也验证了理论公式对接缝破坏模式预测的准确性.

Research on Axial Tensile Strength Design of New Bridge Deck Joint

There is the large amount of steel bar welding and concrete pouring for the wet joints of the traditional concrete bridge deck on site. With the development of rapid bridge construction technology, a new type of deck connection is proposed into the engineering field of vision, that is, the steel bar is not welded, annular steel bar staggered layout of the narrow joint connection. Based on the theoretical research at home and abroad, it is found that this new type of joint consists of two failure modes, that is, rebar yield and core concrete breakage. On the foundation of theoretical work, the test results of the joint under the axial tensile action are given. The calculation result based on the theoretical formula is compared and demonstrated with the experimental results. The influences of the different structural parameters on the joint strength are analyzed. At the same time, the accuracy of the theoretical formula for the prediction of the failure mode of joint is verified.