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肋拱受力是一个过程,在这一过程的不同阶段,二阶效应产生的附加内力和变形是不同的,相应的偏心矩增大系数也是不一样的。从广义上讲,偏心距增大系数或弯矩增大系数表示的是肋拱的二阶效应过程。文章针对现行设计规范中η-l_0法在设计肋拱桥时存在的问题,参考框架结构中杆件计算长度改进方法,在肋拱的二阶效应分析中提出了当量长度(可表示为l_e)的概念,将η-l_0法改进为η-l_e法。
The stress of rib arch is a process. During the different stages of this process, the additional internal forces and deformations caused by the second-order effect are different, and the corresponding coefficient of increase of eccentric moment is also different. In a broad sense, the coefficient of eccentricity increase or the coefficient of increase of moment is the second-order effect process of rib arch. In this paper, aiming at the existing problems of η-1_0 method in designing rib arch bridge in current design code, reference is made to the calculation method of rod length in frame structure, and the equivalent length (which can be expressed as l_e) is proposed in the second-order effect analysis of rib arch Concept, the η-l_0 method for the η-l_e method.