小米醋博物馆砖穹顶结构设计

Structural design of brick dome of Millet Vinegar Museum

山东省淄博市小米醋博物馆的入口大厅采用了砖穹顶结构。利用有限元分析软件对砖穹顶结构进行计算,对不同母线形状的结构方案进行了比选,分析了结构底部设置的3处拱形门洞对结构内力的影响,并采用极限平衡法对结构进行校核,得出了穹顶结构的主要自振模态以及在地震作用下的动力特性。对结构在不同施工阶段的受力进行了分析,建立了精确的砌砖模型,对整个施工过程进行指导和把控。详细介绍了穹顶结构的排砖方式,对传统砌砖工艺进行了改良,以达到结构受力与建筑美观的巧妙结合。结果表明:静力作用下结构底部的门洞顶出现拉应力集中,各门洞顶之间形成了环向拉应力;地震作用下结构中部以及未开洞一侧底部的拉应力值较小且分布均匀,靠近门洞底部的结构拉应力显著增大。

The entrance hall of Millet Vinegar Museum in Zibo city,Shandong Province adopts a brick dome structure.The finite element analysis software was used to calculate the brick dome structure,and the structural schemes of different bus shapes were compared and selected.The influence of three arched door holes set at the bottom of the structure on the internal force of the structure was analyzed,and the limit equilibrium method was used to check the structure.The main natural vibration modes of the dome structure and the dynamic characteristics under earthquake action were obtained.The force of the structure in different construction stages was analyzed,and an accurate bricking model was established to guide and control the whole construction process.The brick arrangement method of dome structure was introduced in detail,and the traditional brick laying process was improved to achieve the ingenious combination of structural stress and architectural aesthetics.The results show that the tensile stress concentration occurs at the top of the door at the bottom of the structure under static force,and the circumferential tensile stress is formed between the tops of the doors.Under the action of earthquake,the tensile stress value in the middle of the structure and the bottom of the unopened side is small and evenly distributed,and the tensile stress of the structure near the bottom of the door increases significantly.