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对于混凝土空心板梁桥,铰缝起着关键的横向传力作用,其力学性能的正确处理和模拟对于整个空心板梁桥受力分析有重要影响。利用混凝土抗拉强度随裂缝宽度变化模型和混凝土拉伸刚化模型,建立应力相对值和裂缝宽度相对值等变量,推导了铰缝处开裂混凝土的弹性模量(铰缝刚度)与裂缝宽度相对值之间的具体关系式,并给出了铰缝刚度折减系数的列式,实现了铰缝受力性能的正确模拟。同时,给出了不同强度等级的混凝土、不同缝宽对应的刚度折减系数。通过工程实例分析,表明本文研究的铰缝受力分析方法正确,提出的铰缝刚度折减系数具有一定的工程实用价值,结论可供实际工程参考。
For the concrete hollow girder bridge, the hinge joint plays a key role in the lateral force transmission. The correct handling and simulation of the mechanical properties of the hollow girder bridge have an important influence on the stress analysis of the whole hollow girder bridge. Using the model of concrete tensile strength with the crack width and the tensile rigidity model of the concrete, the relative stress and the relative value of the crack width are established, and the elastic modulus (hinge stiffness) of the cracked concrete at the hinge joint is compared with the crack width The relationship between the values, and gives the hinge reduction coefficient of stiffness matrix, to achieve a correct simulation of the joint force performance. At the same time, the concrete with different strength grades and the stiffness reduction coefficient with different slot widths are given. Through the engineering example analysis, it shows that the analysis method of joint stress in this paper is correct, and the proposed reduction coefficient of joint stiffness has certain engineering practical value. The conclusion can be used for practical engineering reference.