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弹性地基上的梁和框架正越来越广泛地被应用于水工建筑物中。如船闸、泄洪孔、筏闸、电站尾水等。这些结构的各杆件断面大小相差悬殊,应力值受地基变形的影响,虽然剪切变形所占幅度较大,情况也较复杂,但在有关专业书刊上对这方面的讨论仅涉及剪切变形对结构应力的影响,且只限于简单结构,更未考虑地基变形作用。笔者结合设计实践,以某筏闸闸首为例,运用分析对比方法,讨论剪切变形对弹性地基上框架应力的影响,分析影响幅度及其原因。本文中所提出的方法也适用于其它弹性地基上的建筑物。
Beams and frames on elastic foundations are being used more and more widely in hydraulic structures. Such as ship locks, flood discharge holes, floodgates, power station tail water, etc. The sectional sizes of the rods of these structures are quite different, and the stress value is affected by the deformation of the foundation. Although the shear deformation accounts for a large extent and the situation is also more complicated, the discussion in this regard in the relevant professional publications only involves shear deformation. The effect on structural stress is limited to simple structures, but the effect of ground deformation is not considered. The author combines design practice, taking a sluice gate as an example, using analysis and comparison methods to discuss the impact of shear deformation on the elastic foundation on the frame stress, analysis of the magnitude of the impact and causes. The method proposed in this paper is also applicable to buildings on other elastic foundations.