装配式空心板钢横隔板抗弯数值模拟与破坏机理研究

发布时间：2018-06-20 10:29

本文选题：空心板 + 铰缝　；参考：《公路》2017年11期

【摘要】：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。
[Abstract]:Aiming at the easy damage of concrete hinge joints of highway hollow slabs, an open hole steel plate connection structure is proposed, which forms a steel transverse partition structure between hollow slabs to transfer the load between plates. In order to understand the flexural behavior of the new type hollow slab connection structure, a new type hollow slab bridge was designed. The beam structure with unit length was selected in the middle of the bridge to form the beam structure in the transverse direction, and the finite element model of the pure bending load was established. In order to verify the correctness of the simulation of the bending behavior of perforated steel plates at hinged joints, the negative bending moment test model of composite beams with perforated steel plates is established. The correctness of numerical simulation method for perforated steel plates under bending force is verified by the existing experimental results. The results show that in the numerical simulation of the mechanical properties of steel diaphragm connections of fabricated hollow slabs, the hard contact is used to simulate the normal direction of the interface between steel plate and concrete. Through the contact between steel bar and concrete, a better effect can be obtained by using the method of embedded simulation. The stress mechanism of hollow slab steel transverse partition structure under load is as follows: first, the stress of joint contact surface, When the contact surface reaches partial failure of bearing capacity, the tenon structure composed of undamaged joint contact surface and perforated steel plate and perforated steel bar is subjected to force until failure.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金资助项目,项目编号51478120
【分类号】：U441;U445.7

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