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作用在桥面上的荷载是通过支座间接传给墩台的,因此墩台的内力无法利用其内力影响线简单求得。活载在桥面上的移动是二维的,纵向最不利载位容易确定,但横向最不利载位却很难确定。为了减少计算量,在实际设计计算中,横向通常只计算中载和偏载两个载位。因此,所求得的内力不可能是最大和最小内力。为了解决这一问题,本文利用作者提出的二维动态规划法加载方法计算桩柱式墩台的内力,效果很好。
The load acting on the bridge deck is indirectly transmitted to the piers and abutments through the supports. Therefore, the internal forces of piers and abutments can not be easily calculated by using the influence of their internal forces. The movement of live loads on the bridge deck is two-dimensional, and the most unfavorable load position in the longitudinal direction is easy to determine, but the most unfavorable load position in horizontal direction is hard to be determined. In order to reduce the amount of calculation, in the actual design and calculation, the horizontal direction usually only calculates the two positions of medium load and partial load. Therefore, the internal forces obtained can not be the maximum and minimum internal forces. In order to solve this problem, this paper uses the two-dimensional dynamic programming method proposed by the author to calculate the internal forces of pile-pier.