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优化了传统混凝土箱梁腹板与底板,提出了装配式桥梁新型结构形式——矩形钢管混凝土组合桁梁桥,从总体设计、主桁选型、横断面选型、桥面板选型、杆件选型、节点选型与连接构造方面介绍了其结构设计优化过程;从桥梁的静力性能与地震响应、桥面板的有效宽度与负弯矩区力学性能方面对矩形钢管混凝土组合桁梁桥进行了有限元分析,并将部分组合技术应用到负弯矩区桥面板连接件的设计中;从技术性与经济性角度将矩形钢管混凝土组合桁梁桥与预应力混凝土箱梁桥进行了工程量和施工便捷性对比。研究结果表明:矩形钢管混凝土组合桁梁桥结构选型符合桥梁预制装配、快速建造的工业化要求,主桁各杆件受力明确,受力形态主要为轴向拉、压力;负弯矩区桥面板有效宽度系数为0.899;采用部分组合技术可使桥面板轴向拉力下降75.3%,有效地提高了桥面板的抗裂性能;矩形钢管混凝土组合桁梁桥初始输入地震力占同等跨度预应力混凝土箱梁桥的58.9%,说明矩形钢管混凝土组合桁梁桥具有良好的抗震性能;钢材用量、混凝土用量、上部结构质量与预应力混凝土箱梁桥的比值分别为1.241、0.485、0.575,说明矩形钢管混凝土组合桁梁桥结构轻巧,材料利用率高,工程造价低,具有经济优势。
The traditional concrete box girder web and floor are optimized and a new type of CFG truss girder bridge is put forward, which includes the overall design, main truss selection, cross-section selection, bridge deck selection, Type selection, node selection and connection construction, the structural design optimization process is introduced. The CFST truss girder bridge is studied in terms of the static performance and seismic response of the bridge, the effective width of the bridge deck and the mechanical properties of the negative bending moment zone The finite element analysis and some combination techniques were applied to the design of the bridge deck connections in the negative moment area. From the perspective of technology and economics, the rectangular CFST truss girder bridge and the prestressed concrete box girder bridge were constructed. Construction convenience contrast. The results show that the structure selection of the rectangular CFST truss girder bridge meets the industrialized requirements of prefabrication and rapid construction of the bridge. The stress of the main girders is clear and the main stress forms are axial pull and pressure. The effective width coefficient of the panel is 0.899. The axial tensile force of the deck slab is reduced by 75.3% by partial combination technology, which effectively improves the crack resistance of the deck slab. The initial input seismic load of the rectangular CFST truss girder bridge accounts for the equivalent span prestressed concrete 58.9% of the box girder bridge, indicating that the rectangular CFST truss girder bridge has good seismic performance; steel consumption, concrete dosage, the ratio of superstructure quality and prestressed concrete box girder bridge ratio were 1.241,0.485,0.575, indicating that the rectangular steel pipe Concrete composite truss girder bridge lightweight structure, high material utilization, low construction cost, with economic advantages.