基于挠度设计限值的等截面混凝土梁桥承载力快速评定方法

Fast Evaluation Method to Bearing Capacity of Concrete Beams with Equal Cross-Section Based on Deflection Design Limits

目前我国中小跨径桥梁数量众多,其承载力评定工作无比艰巨,通常桥梁承载力评定工作需处理大量检测数据、计算复杂。必要时需加以实桥荷载试验法辅助评定,消耗大量人力物力、甚至需要封闭交通。通过对钢筋混凝土梁受力变形全过程分析后,提出界限梁刚度概念,计算既有桥梁承载能力时挠度的限值,提出基于挠度设计限值的混凝土梁桥承载力快速评定方法。该方法原理清晰、计算简单、无需荷载试验,可对桥梁承载力进行快速评定,迅速锁定承载力不足的桥梁。

At present,there are a large number of small and medium span bridges in China,and the evaluation of its bearing capacity is very arduous.Usually,the evaluation of bridge bearing capacity needs to deal with a large number of testing data and complex calculation.If necessary,the actual bridge load test method should be used to assist the evaluation,which will consume a lot of manpower and material resources,and even need to close the traffic.Through the analysis of the whole process of the deformation of reinforced concrete beams,the concept of the limit beam rigidity is put forward,and the limit of the deflection is calculated when the bearing capacity of the bridge is available,and the fast evaluation method of the bearing capacity of the concrete beam bridge based on the limit value of the deflection design is proposed.The method is clear in principle,simple in calculation and no load test.It can quickly assess the bearing capacity of bridges and quickly lock bridges with insufficient bearing capacity.