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钢筋混凝土简支梁桥由于结构形式简单常被用于人行天桥中,跨高比是该类型桥梁设计的关键因素之一。为了得到该类型人行天桥的最优跨高比,文中采用理论计算与模型试验结合的方式对该问题进行了研究,总结了规范中控制正截面抗弯承载力及跨中挠度的计算方式,通过算例采用两种方式进行计算,并利用规范中结构裂缝宽度的规定对其结果进行验算,得到控制跨中挠度的计算方式较为适合计算同类型桥梁的跨高比的结论,并采用模型试验进行了验证。同时,采用该方式对不同截面钢筋砼简支梁人行天桥进行了理论计算,为工程设计提供了可供参考的依据。
Reinforced concrete beam bridges are often used in footbridges because of their simple structure. The span ratio is one of the key factors in the design of this type of bridge. In order to get the optimal span ratio of this type of pedestrian bridge, this paper studies the problem by combining the theoretical calculation with the model test, and sums up the calculation method of controlling the normal section flexural capacity and the mid-span deflection in the code, The calculation examples are calculated in two ways, and the results are checked by the provisions of the structural crack width in the code, and the calculation method for controlling the mid-span deflection is more suitable for calculating the span ratio of the same type of bridges. The model test Verified. At the same time, this method has been used to calculate the RC girder bridges with different cross sections, which provides a basis for engineering design.