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为对比混凝土腹板、平钢腹板及波纹钢腹板3种腹板形式对箱形梁桥体外预应力效率及经济性的影响,通过卡式定理推导验证了波纹钢腹板箱梁桥纵向刚度小于混凝土腹板箱梁桥及平钢腹板箱梁桥。基于推导结果,在预应力作用下,波纹钢腹板预应力效率应高于其他两种腹板形式箱梁桥。该文设计了3座配束相同、腹板形式不同的简支箱梁桥,利用有限元软件Ansys分别建立了有限元模型,计算了沿梁纵向1/4、1/2及3/4共3个截面的预应力效率。结果表明:波纹钢腹板预应力效率最高。通过比较3种腹板箱梁桥的初始费用及寿命周期成本现值,波纹钢腹板箱梁桥的寿命周期成本现值最低,经济性最优。
In order to compare the effect of three kinds of webs, including concrete web, flat steel web and corrugated steel web, on the external prestressing efficiency and economic efficiency of box girder bridge, the longitudinal and longitudinal distribution of corrugated steel web box girder bridge The stiffness is less than the concrete box girder bridge and the flat steel web box girder bridge. Based on the results of the derivation, the prestressing efficiency of corrugated steel webs under prestress should be higher than that of the other two kinds of box girder bridges with webs. In this paper, three simple girder bridges with the same beam shape and different web shapes are designed. Finite element models are established by using finite element software Ansys respectively. Three sections of prestressing efficiency. The results show that corrugated steel webs have the highest prestressing efficiency. By comparing the initial cost and life cycle cost of the three kinds of web box girder bridges, the present value of the life cycle cost of corrugated steel web box girder bridge is the lowest and the economy is the best.