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钢梁两端约束刚度对其悬链线效应影响很大,因此钢梁悬链线效应中约束刚度的研究是一个重要的内容。该文研究“双跨钢梁”两端的钢梁、楼板以及栓钉连接件对钢梁的轴向约束作用。首先,提出提供约束的钢梁、楼板以及栓钉连接件的非线性位移和变形函数。其次,利用最小势能原理,推导楼板系统对去柱钢框架梁轴向约束刚度的计算公式。考虑提供约束的楼板总是局限在一定范围内,提出并使用楼板“临界长度”对理论公式进行了修正。最后,采用20个有限元算例对理论公式进行算例验证,证明了该文研究结论的可靠性。
The constraint stiffness at both ends of the steel beam has a great influence on the catenary effect, so the research on the restraining stiffness in the catenary effect of the steel beam is an important issue. In this paper, the axial restraint of steel beams on both ends of steel beams, floor slabs and studs is studied. Firstly, the nonlinear displacement and deformation functions of steel girders, floor slabs and studs providing restraint are proposed. Secondly, by using the principle of minimum potential energy, the formula for calculating the axial restraint stiffness of the steel frame girder with delaminated columns by the floor system is deduced. The floor considering the constraints is always confined to a certain extent, and the theoretical formula is amended and proposed using the floor “critical length ”. Finally, 20 finite element examples are used to validate the theoretical formula, which proves the reliability of the conclusion.