柱式桥墩盖梁内力计算方法探讨

笔者阐述了两种不同计算图式下盖梁内力计算方法,并进行了对比分析.分析表明,当考虑立柱刚度影响时,盖梁内力将进行二次分配,致使跨中正弯矩减小、支点负弯矩增大(称之为“刚架效应”),随着立柱与盖梁的线刚度比的增大,此种效应越显著.当立柱与盖梁的线刚度比较小时,可采用简化的双悬臂简支梁(连续梁)图式,但在支点截面应作适当的加强处理;而对于重要桥梁或立柱与盖梁的线刚度比较大的桥梁,宜采用双悬臂刚架结构图式进行计算.

A probe into the calculation method on coping's internal force of pillar pier

The paper sets forth the calculation method of coping's internal force undertow different calculation graphic formulas and comparative analyses are made.As indicated in the analyses: the coping's internal force shall be quadrate allocated when the rigidity of the pillar is taken into account which leads to the diminution of middle span positive flexural torque and augment of fulcrum negative flexural torque(called Rigid Frame Effect).It goes prominently as the linear rigidity ratio of the pillar and coping increases.When the linear rigidity ratio is small,simplified twin-cantilever free beam(continuous beam) graphic formula shall be adopted whereas the fulcrum section shall be properly reinforced;while to the important bridges or bridges with large linear rigidity ratio of the pillar and coping,twin-cantilever rigid-framed structure graphic formula shall be appropriately used for calculation.