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为研究结合面底部带门式钢筋的铰接空心板桥铰缝受力性能,以带深铰缝构造的铰接空心板桥为研究对象,总结了我国铰接空心板桥铰缝构造的演变过程,进行了一跨8 m跨径的空心板桥非线性有限元参数分析,分析了不同铰缝构造参数下空心板桥铰缝构造的开裂荷载、裂缝分布等破坏模式,讨论了现有铰缝构造的改进措施。结果表明:在结合面底部增设门式钢筋,不能明显地提高铰缝构造的开裂荷载,但可以提高铰缝构造的通缝荷载,延缓空心板与铰缝结合面竖向通缝和纵桥向通缝的形成;增大门式构造钢筋直径对结合面开裂荷载、通缝荷载和最终的裂缝分布没有明显改善;增大混凝土强度对空心板与铰缝结合面的改善作用有限;提高空心板与铰缝结合面黏结力可以提高结合面通缝荷载,并能减小裂缝分布范围;现有文献提及的3种铰缝钢筋布置形式和增大钢筋直径的方法较难从根本上改善结合面受力性能。
In order to study the joint performance of the hinged hollow slab bridge with ganged rebar at the bottom of the face, the hinge hollow slab bridge with deep hinge was taken as the research object, and the evolution process of the joint structure of the articulated hollow slab bridge in our country was summarized. The nonlinear finite element analysis of a span bridge with 8 m spans is carried out. The failure modes, such as cracking load and fracture distribution of the hollow slab bridge under different hinge joint structural parameters, are analyzed. The failure modes of the existing hinge joints improvement measures. The results show that the addition of portal reinforcement at the bottom of the joint can not obviously improve the cracking load of the hinge joint structure, but can increase the through-seam load of the hinge joint structure and delay the vertical through-seam and longitudinal bridge The increase of the diameter of the portal structure steel bar to the joint surface cracking load, through-seam load and the final crack distribution is not significantly improved; increasing the strength of concrete hollow plate and the hinge joint surface to improve the role of limited; improve the hollow plate and The joint force of the joints can improve the joint load and reduce the distribution of cracks. It is difficult to fundamentally improve the bonding surface with the three kinds of reamed seam reinforcement layout and the method of increasing the reinforcement diameter Force performance.