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约束钢梁在分布荷载作用下的变形和耗能是构件抗爆以及结构抵抗连续性倒塌研究的基础。本文提出了同时承受轴向弹簧和转动弹簧约束的钢梁在分布荷载作用下的计算模型,根据约束钢梁内力将钢梁反应分为5个阶段,采用约束系数方法和刚塑性铰模型详细推导了约束钢梁不同阶段的荷载-跨中挠度曲线计算公式。重点研究了约束钢梁由抗弯向拉弯转化并最终主要依靠拉力抵抗外荷载的过程,即钢梁在分布荷载作用下的悬链线效应问题。另一篇系列文章将通过数值算例验证本文公式的准确性。
The deformation and energy dissipation of the constrained steel beam under the distributed load is the foundation of the study on the antiknock of the member and the structural collapse. In this paper, a computational model of steel girders constrained by both axial springs and rotating springs under distributed loads is proposed. The steel girder responses are divided into five stages according to the internal forces of constrained girders. The restraint coefficient method and rigid-plastic hinge model are derived in detail Load-span mid-span deflection curves for different phases of constrained steel beam. This paper focuses on the transformation of confined steel beams from bending to bending, and finally mainly relies on the pulling force to resist the external load, that is, the catenary effect of steel beams under distributed loads. Another series of articles will verify the accuracy of the formula in this paper by numerical examples.