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连续梁桥就其恒定抗弯刚度(EI)和等长内跨的对称结构来说,可用很简明的方法加以分析。当荷载施加于单独一跨时,所有端弯矩可以利用基于节点转动相容性导出的系数,由简单的计算直接确定,而不用迭代或联立方程式。然后,用叠加法可以得到好几跨的多重荷载结果。本文提出3或4跨连续梁端弯矩的闭型表达式,继而提出适于任何跨数的通用式,这就为对活式微型计算机的使用提供了有效算法。为了说明方法的实际应用,提供了公路连续梁桥由恒载和车道荷载两者引起的弯矩闭型表达式,以及把来自桥梁设计车辆的若干集中荷载作为一个单元处理的简单方法。要使这种方法适合个别设计师的需要,也容易加以改制。
Continuous beam bridge For its constant flexural rigidity (EI) and symmetrical structure of equal length span, can be a very simple method to be analyzed. When a load is applied to a single span, all end moments can be derived directly from simple calculations using coefficients derived from the rotational compatibility of the nodes, without iteration or simultaneous equations. Then, using the superposition method, multiple cross-loads can be obtained. This paper presents a closed-form expression for 3-to-4 span continuous bending moment of the continuous beam, which in turn provides a generalized formula for any span, which provides an efficient algorithm for the use of live microcomputers. To illustrate the practical application of the method, a closed-form formula for moment of moment caused by both dead load and lane load is provided for a continuous highway bridge and a simple method of treating several concentrated loads from a bridge design vehicle as a unit. To make this method suitable for individual designer needs, but also easy to be restructured.