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温度作用效应对大跨结构性能的影响已经倍受关注,然而目前的研究主要集中在单独的钢结构上,忽略了下部支承结构及地基的温度作用对上部钢结构温度效应的影响。以一单层网壳为例,建立包含下部混凝土结构及地基整体模型,研究下部支承结构及地基的整体协同变形作用对单层网壳性能的影响规律。通过不同工况对比发现,合理地考虑下部支承结构的协同变形可以有效减小上部单层网壳的位移50%以上、应力60%以上以及支座水平反力80%以上;考虑地基的协同变形作用后可进一步减小杆件的最大应力17%,支座最大径向反力减小了66%,环向最大反力减少了63%,竖向最大反力减小了72%;考虑地基的非均匀温度与均匀温度相比,只能较小幅度地减小上部单层网壳节点的最大Z向位移和合位移,对单层网壳其他力学性能几乎没有影响。
The effect of temperature effect on the performance of long-span structures has drawn much attention. However, the current researches focus on single steel structures and ignore the influence of the temperature of the lower support structures and the foundation on the temperature effects of the upper steel structures. Taking a single-layer reticulated shell as an example, an overall model including the lower concrete structure and the foundation is established, and the influence of the overall co-deformation of the lower support structure and the foundation on the performance of the single-layer reticulated shell is studied. Through the comparison of different working conditions, it is found that reasonable consideration of the synergistic deformation of the lower support structure can effectively reduce the displacement of the upper monolayer reticulated shell by more than 50%, the stress more than 60% and the bearing horizontal reaction force more than 80% After the action, the maximum stress of the rod can be further reduced by 17%, the maximum radial reaction force of the support can be reduced by 66%, the maximum reaction force can be reduced by 63% and the maximum vertical reaction force can be reduced by 72% Compared with the uniform temperature, the maximum Z-displacement and co-displacement of the upper single-layer reticulated dome can be reduced only slightly, which has almost no effect on other mechanical properties of the single-layer reticulated shell.