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针对公路空心板混凝土铰缝易损坏现象,提出了开孔钢板连接构造,在空心板间形成钢横隔板结构传递板间荷载。为了掌握新型空心板连接结构的抗弯受力性能,试设计新型空心板桥,在其跨中顺桥向选取单位长度形成横桥向的梁式结构,建立其纯弯加载的有限元模型。为验证开孔钢板在铰缝处弯曲性能模拟的正确性,另外建立了设置开孔钢板的组合梁负弯矩试验模型,利用已有试验结果验证开孔钢板在弯曲受力下数值模拟方法的正确性。研究结果表明,在装配式空心板钢横隔板连接构造受力性能数值模拟中,钢板与混凝土界面法线方向的接触模拟采用硬接触,贯穿钢筋与混凝土的接触关系采用嵌入的模拟方式可以得到较好的效果;空心板钢横隔板结构在荷载作用下的受力机理为:首先由铰缝接触面受力,当接触面达到承载力部分破坏后,由未破坏的铰缝接触面和开孔钢板与贯穿钢筋组成的榫结构受力,直至破坏。
Aiming at the phenomenon of easily damaged hinge joints of highway hollow slab concrete, a perforated steel plate connection structure is proposed, and a steel diaphragm structure is formed between the hollow plates to transmit load between the plates. In order to grasp the flexural behavior of the new type of hollow-slab connection, a new type of hollow slab-bridge is designed. The transverse beam structure is formed by choosing the unit length along the mid-span bridge and the finite element model of pure bending load is established. In order to verify the correctness of the bending performance of perforated steel plate at hinge joints, a negative bending moment test model of composite steel beams with perforated steel plates was set up. The existing experimental results were used to verify the numerical simulation method of perforated steel plate under bending force Correctness The results show that in the numerical simulation of the mechanical performance of the prefabricated hollow slab steel diaphragm structure, the contact simulation of the normal direction of the steel plate and the concrete interface adopts the hard contact. The contact relationship between the steel bar and the concrete can be obtained by the embedded simulation method Better effect; hollow slab steel diaphragm structure under load in the mechanism of stress: the first by the hinge joint surface force, when the contact surface to achieve some damage to the bearing capacity, from the undamaged hinge joint surface and The perforated steel plate and through the rebar tenon structure force, until the destruction.