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在短期荷载作用下钢筋混凝土梁的裂缝间距与宽度的计算,目前有许多半理论半经验或者由试验统计得到的公式可供应用与参考。本文首先概述钢筋混凝土梁裂缝种类及开展情况,然后通过示例说明我国现行《公路桥规》裂缝公式中值得商榷的问题。在此基础上作者提出计算长期与反复荷载作用下裂缝间距与宽度的建议公式,并对其中ψ,γ,α与θ四个增长参数作了分析与估算。最后用邕江大桥12年长期观测资料进行验证。
In the calculation of crack spacing and width of reinforced concrete beams under short-term loading, there are currently many semi-theoretical semi-empirical or formulae obtained from experimental statistics for application and reference. This article first summarizes the types and development of cracks in reinforced concrete beams, and then illustrates the problems in China’s current “bridges for highways and bridges” formula that are worthy of discussion. On this basis, the author proposes a formula for calculating the spacing and width of cracks under long-term and repeated loads, and analyzes and estimates the four growth parameters of ψ, γ, α and θ. Finally, verify the 12-year long-term observation data of the Minjiang River Bridge.