公路桥桥面高程计算分析

公路桥桥面高程计算与下部墩台设计紧密相关,为精确计算桥面高程,利用数学方法,推演出高程计算公式,提出桥面高程计算的两种实用方法:投影法和直线内插法,对两种方法的优缺点及适用性进行论述,总结出两种方法的适用条件:①不受竖曲线影响时,无论正交还是斜交,两种计算方法通用;②受竖曲线影响,但正交时,两种方法也通用;③受竖曲线影响且斜交时,两种计算方法不再通用,但当竖曲线半径R足够大,即使坡度差Δi和斜交角度θ达到最大,两种方法的计算结果也非常接近,在工程应用领域可以认为两种方法是通用的.

Analysis of Highway Bridge Elevation Calculation

The calculation of highway bridge elevation has a close relationship with the design of lower bridge piers. The mathematical method was adopted to deduce the formula for calculating the bridge eleva- tion. Firstly, two practical methods of elevation calculation was devised.the projection method and the line- ar interpolation method, and then merits, demerits and applicability of the methods were discussed. The ap- plicable conditions of the methods are as follow. （1）when the two calculation methods are not affected by the vertical curves which are either orthogonal or oblique, the methods are common; （2） when the two methods are influenced by vertical curves which are orthogonal,the methods are common~ （3）when the two methods are influenced by the vertical curve which are oblique, the two methods are not common. Howev- er,when the radius of the vertical curve R is large enough and even if the slope difference △i and oblique angle θis maximum,the results of the two calculation methods are very close, so the two methods can be considered common in the engineering application field.