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前言建造大跨度钢筋混凝土拱桥,首先必须解决的一个问题是厖大数量的钢拱架和必要的机具设备。因此如何减少钢拱架的使用数量便成为一个很重要的课题。本设计所采用的钢拱架,考虑了拱肋分层拼装过程中拱架与拱肋底版联合受力的作用,大大减少了拱架的负荷,从而达到少用拱架的目的。一、构造及计算假定拱架跨度为142.48m,矢高36.99m,由八片常备式(W型)桁架拼组而成。拱架中间两片承受拱肋联结风撑的重量,两侧各三片分别承受一片拱肋的重量,各片
Foreword One of the first issues that must be addressed in the construction of a long-span reinforced-concrete arch bridge is the large number of steel arches and the necessary equipment. Therefore, how to reduce the number of steel arch frames has become a very important issue. The steel arch frame used in the design considers the joint force of the arch frame and the arch rib bottom plate in the layering process of the arch ribs and greatly reduces the load of the arch frame so as to achieve the purpose of less using the arch frame. First, the structure and calculation Assuming that the arch span of 142.48m, the arrow high 36.99m, by the eight standing (W-type) truss together. Arch in the middle of the two arch ribs to withstand the weight of the wind support, each of the three sides of each bear the weight of a rib, each piece