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以直径为120 m的巨型封闭式圆形混凝土储煤浅筒仓为研究对象,穹顶为网壳,其顶部网壳支座形式采用悬臂短柱铰接(支座Ⅰ)、橡胶支座支承(支座Ⅱ)、径向释放橡胶支承(支座Ⅲ),分别对整体筒仓在不均匀堆载与环境温度作用下的协同作用进行了有限元分析,主要对筒仓的位移变形、环向应力、环向轴力分布进行了系统的对比分析;对采用3种支座形式的筒仓整体模型进行了地震反应谱分析;最后对顶部网壳采用支座Ⅲ的整体筒仓模型与对应的无顶部网壳筒仓模型在不均匀堆载与环境温度条件下的位移变形与环向应力进行了对比分析。通过分析,对以往把顶部网壳的作用简单等效为节点荷载作用于筒仓顶部的研究结果进行了探讨。
Taking a 120m-diameter, large, closed circular concrete coal storage shallow silo as the research object, the dome is a reticular shell. The top reticulated shell support adopts cantilevered short column articulation (support Ⅰ) and rubber support Seat Ⅱ) and radial release of rubber bearing (support Ⅲ). The synergetic effect of the whole silo under uneven loading and ambient temperature was analyzed by finite element method. The main results are as follows: displacement of silo, circumferential stress , And the axial distribution of axial force were systematically analyzed. Seismic response spectrum analysis was carried out on the monolithic silo model with three types of supports. Finally, the overall model of the silo shell with support Ⅲ and the corresponding The displacement and the circumferential stress of the top reticulated silo model under non-uniform loading and ambient temperature are compared and analyzed. Through the analysis, the previous research on the effect of the top reticulated shell on the top of the silo simply and equivalently was carried out.