SWFC连续刚构桥关键构造研究

发布时间：2018-06-08 23:56

本文选题：弯坡斜 + 曲线连续刚构　；参考：《重庆交通大学》2014年硕士论文

【摘要】：针对山区公路大纵坡、小半径平曲线弯坡斜梁桥的适应性问题，导师提出SWFC连续刚构的构想：以普通钢筋混凝土桥梁的施工方式，通过在主梁的受拉侧设置开孔带肋钢板（Steel），在受拉区设置带肋钢筋网片（Web）护面，并采用高掺量柔性纤维（Fiber）的复合混凝土（Concrete）结构——SWFC复合结构，以此来提高桥梁结构的抗裂和阻裂性能。已有试验研究结果表明：SWFC复合混凝土结构较常规钢筋混凝土结构的抗裂强度可提高2-3倍，同级荷载下的裂缝宽度仅为常规钢筋混凝土结构的1/2-1/3，尤其适宜于难以用预应力布束来克服混凝土受拉开裂的复杂变化结构。基于以上背景，本文所做主要工作如下： ①分析了在特定环境条件下SWFC连续刚构桥的优势和适用性，对SWFC结构中带肋钢板、聚丙烯纤维、带肋钢筋网片的抗裂、阻裂机理进行分析，论证了SWFC结构的合理性与可靠性； ②对依托工程桥梁，，具体研究了主梁各区段适宜截面、正负弯矩区段带肋钢板构造及其钢筋构造，分别论述了其可行性和合理性； ③基于钢筋混凝土统一本构，建立主梁负弯矩区段箱梁顶板的实体有限元模型，对箱梁顶板受力全过程进行了分析，研究了不同荷载工况下箱梁顶板、带肋钢板、抗剪联接构造的力学行为； ④基于钢筋混凝土统一本构,建立主梁正弯矩区段Π型梁的实体有限元模型，对跨中区段Π型梁受力全过程进行了分析，研究了不同活载工况下Π型梁、带肋钢板、抗剪联接构造的力学行为。
[Abstract]:Aiming at the adaptability of mountain highway bridge with large longitudinal slope and small radius curve curved slope, the supervisor put forward the conception of SWFC continuous rigid frame: the construction method of ordinary reinforced concrete bridge, In the tensile side of the main beam, the steel plate with ribbed holes and ribbed steel plates are set up in the main beam, and the ribbed steel mesh and Web) surface are installed in the tensile area, and the composite concrete Concretestructure with high content of flexible fiber is adopted, which is the composite structure of SWFC. In this way, the crack resistance and crack resistance of bridge structure are improved. The experimental results show that the crack strength of the SWFC composite concrete structure is 2-3 times higher than that of the conventional reinforced concrete structure. The crack width under the same load is only 1 / 2 / 1 / 3 of that of the conventional reinforced concrete structure, so it is especially suitable for the complex structure which is difficult to overcome the tensile cracking of concrete with prestressing tendons. The main work of this paper is as follows: 1. The advantages and applicability of SWFC continuous rigid frame bridge under special environment are analyzed. The crack resistance and crack resistance mechanism of ribbed steel plate, polypropylene fiber and ribbed steel mesh in SWFC structure are analyzed. The rationality and reliability of SWFC structure are demonstrated. Based on the unified constitutive structure of reinforced concrete, the solid finite element model of box girder roof in negative bending moment section of main girder is established, and the whole process of box girder roof bearing force is analyzed. The mechanical behavior of box girder roof plate, ribbed steel plate and shear joint structure under different load conditions is studied. 4 based on the unified constitutive structure of reinforced concrete, the solid finite element model of the girder in the section of positive bending moment is established. In this paper, the whole process of the stress of the girder in the middle section of span is analyzed, and the mechanical behavior of the girder with ribs, ribbed steel plate and shear connection structure under different live load conditions is studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23

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