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在多跨连续拱桥的设计中,现有的连拱计算方法都忽略了拱上结构的影响,而是按裸拱连拱进行计算。但对于我国广泛采用的拱式拱上结构的连续拱桥,由一座模型桥试验表明,拱上结构与主拱圈联合作用的影响较为显著,如拱顶截面的活载弯矩可减小15～25%,拱脚截面可减小25～40%。可见在连拱计算中宜考虑拱式拱上结构的影响。本文通过模型桥试验和理论分析相结合的方法,对这种拱式拱上结构多孔连续拱桥的连拱计算,试图提出与实际受力情况基本相符的计算图式,并在此基础上拟出了一个供讨论和试用的实用简化计算图式。
In the design of multi-span continuous arch bridge, the existing double arch calculation method ignores the influence of the arch structure, but calculated according to the arched arch. However, for the continuous arch bridge with arch arch structure widely used in our country, the test of a model bridge shows that the joint effect of the arch structure and the main arch ring is more significant. For example, the live load bending moment of the arch section can be reduced by 15 ~ 25%, arch foot cross section can be reduced 25 ~ 40%. Can be seen in the calculation of arches should consider the arch arch structure. In this paper, through the combination of model bridge test and theoretical analysis, this paper attempts to calculate the double arch of the continuous arch bridge with arched arch structure, and tries to put forward the calculating scheme which is basically consistent with the actual stress. Based on this, A pragmatic simplified calculation for discussion and trial.