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针对矮塔斜拉桥的受力特点,现有的界定矮塔斜拉桥与斜拉桥索梁活载比简化公式存在缺陷。采用比拟梁法,推导出车道荷载作用下的索梁活载比计算公式。比较了该公式与已有简化公式和有限元计算结果,结果表明,该公式与有限元解更为逼近。研究表明,在计算矮塔斜拉桥的索梁活载比时要计入车道荷载中的集中荷载的影响,并提出权矩阵可界定矮塔斜拉桥、斜拉桥及连续体系梁桥。
In view of the mechanical characteristics of the short pylon cable-stayed bridge, the existing simplified formulas for determining the live load-carrying ratio of the short pylon cable-stayed bridge and the cable-stayed bridge have defects. By using the comparative beam method, the calculation formula of live load ratio of cable girder under the action of lane load is deduced. Comparing the formula with the simplified formula and the finite element calculation results, the results show that the formula and the finite element solution are more approximate. The research shows that when calculating the live load ratio of the cable girder of the short pylon cable - stayed bridge, the influence of the concentrated load in the lane load is to be taken into account. The weight matrix can define the dwarf cable - stayed bridge, cable - stayed bridge and continuous beam bridge.