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双曲拱桥在公路上已有很大发展。67年在铁路上开始采用了这类桥,本文对双曲拱桥的计算方法作了较系统的介绍,可供设计人员参考。关于计算温度内力时,采用I/2受压弹性模量,计算混凝土收缩变形引起内力时,采用I/3受压弹性模量,是根据公路上已建桥梁的实践经验总结而来,在铁路上建桥经验尚少的情况下,仍以采用E值为宜。拱肋与拱波之间的连接面是较薄弱环节,在设计与施工中应予以重视,为了增加连接强度,本例的拱肋宽度35.5cm宜适当加宽,以增加拱肋与拱波处的连接面积。
Double curved arch bridge has been on the road to great development. 67 years in the railway began to use such a bridge, this article on the calculation method of double curved arch bridge made a more systematic introduction, for designers reference. When calculating internal temperature force, I / 2 compressive elastic modulus is used to calculate the compressive elastic modulus of I / 3 when calculating the internal force caused by concrete shrinkage deformation. Based on the practical experience of bridges on the highway, On the bridge experience is still small, still use E value is appropriate. The connecting surface between the arch rib and the arch wave is the weakest link, which should be paid attention to in the design and construction. In order to increase the connection strength, the rib width 35.5cm in this case should be widened appropriately to increase the arch rib and arch wave The connection area.