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弧形钢闸门是水利水电工程中应用十分广泛的门型。在实腹式主横梁式弧形闸门中，由主横梁和支臂构成的主框架是弧形闸门的主要承重结构。主横梁与支臂的单位刚度比是弧形闸门主框架设计的重要参数，它协调着框架内力的分配，其取值合理与否直接影响着整个弧形闸门的安全性和经济性。采用优化设计理论对工程实例中６０扇潜孔式和５０扇露顶式弧形钢闸门直支臂Π型框架进行了优化设计，从而得到这两种门型的主横梁与支臂单位刚度比的合理取值范围，并对取值影响因素作了分析
Arc steel gate is water conservancy and hydropower projects in a very wide range of applications. In the actual belly main beam arc gate, the main frame composed of the main beam and the support arm is the main load-bearing structure of the arc gate. The unit rigidity ratio of the main beam and the support arm is an important parameter in the design of the main arch of the arc gate. It coordinates the distribution of the force in the frame, and its value is reasonable or not, which directly affects the safety and economy of the whole arc gate. Optimized design theory was used to optimize the design of the Π-type frame of 60 straight-through outriggers with 60 DTH and 50 open-circuit arc steel gate in the engineering example, A reasonable range of values, and analysis of factors affecting the value