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钢筋混凝土箱形拱在拱架上现浇施工时,或圬工拱在拱架上砌筑时,采用分环分段的施工方法,可以利用先期形成的拱环与钢拱架的联合作用,减少拱架的用钢量,达到节省施工成本的目的。为了更加深入地理解该问题,利用虚功原理,研究了拱圈与拱架的联合作用机理,揭示了其荷载分配比例与拱环和拱架的相对刚度有着直接的关系,并在此基础上给出了一个按施工过程计算拱环和拱架分配荷载比例的计算公式,该公式考虑了混凝土强度随时间发展的过程,并在一定程度上考虑了不同的分环施工工艺,还提出了一个便于工程应用的简化公式,该简化公式的计算结果是偏于安全的。
Reinforced concrete box-shaped arch in the cast-in-place construction, or Gong Gong in the arch on the masonry, the use of sub-ring construction method, you can use the pre-formed arch ring and steel arch joint action, Reduce the amount of steel arch, to achieve the purpose of saving construction costs. In order to understand this problem in more depth, the mechanism of joint action between arch ring and arch was studied by the principle of virtual work, and the relationship between load distribution ratio and the relative stiffness of arch ring and arch was directly related. Based on this, A calculation formula for calculating the distribution load ratio of arch ring and arch frame according to the construction process is given. The formula takes into account the process of concrete strength development with time, and to a certain extent, takes into account different construction techniques of sub-ring and also proposes a A simplified formula for engineering applications that is computationally safer.