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钢筋混凝土双铰平板拱桥之双铰一般取为平铰,即是在铰面处理上将拱脚斜面与拱座斜面均作成平面并使它们直接接触而不加任何衬垫物。这种形式的平铰构造对拱脚转动有一定的约束,可以改善平板拱的受力,而且施工简便,因而工程实践的效果是非常良好的。但是平铰并非理想铰。理想校对转动是没有约束的,而平铰对转动位移的一定约束作用是不可忽略的。当拱脚在外因作用下发生转动位移时,会使反力作用点的位置发生偏移而产生反力矩,模型试验也证实平铰支座是介于铰支座与固定支座之间的一种特殊支座形式。比较准确地分析平铰支座的受力与变形特点,提供更为接近工程实际的
The double hinge of the double-hinged reinforced-concrete arch bridge is generally taken as the flat hinge, that is, the flat surface of the inclined surface of the arch foot and the inclined surface of the abutment is formed on the hinge surface treatment to make them directly contact without any lining material. This form of flat hinge structure has certain constraints on the rotation of the arch, can improve the force of flat arch, and the construction is simple, so the effect of engineering practice is very good. But flat hinge is not ideal hinge. Ideal proofreading rotation is not constrained, and flat hinges on the rotational displacement of a certain constraint can not be ignored. When the arch foot is rotated and displaced under the external factor, the position of the reaction force point will be offset to generate the reaction torque. The model test also proves that the plain hinge support is located between the hinge support and the fixed support Species special support form. Accurately analyze the characteristics of force and deformation of plain hinges to provide more practical engineering