浅谈柱式墩盖梁的内力计算

Elementary Discussion on Internal Force Calculation of Column Pier Cover Beam

该文通过有限元分析计算了两种不同计算模式下的盖梁内力。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,随着立柱与盖梁的线刚度比的增大,此种效应越显著。在工程实际应用中,由于工期紧张等因素,当盖梁与立柱的线刚度比大于2时,可采用简化的双悬臂简支梁(连续梁)图式,但在支点及跨中截面,应适当提高。

The article calculates the internal forces of cover beams under two different calculation modes by the analysis of finite elements.The analysis makes clear that when considering the rigidity influence of upright column,the internal force of cover beam will be secondarily distributed so as to make the positive moment in the span decrease and the negative moment support increase,and this kind of effect is more obvious with the increment of linear stiffness ratio of the upright column and cover beam.In the engineering practice and as the factors of the constructing period limit,it can be to use the simplified double-cantilever simple-support beam(continuous beam) pattern when the linear stiffness ratio of the upright column and cover beam is larger than 2,but it should be properly enhanced on the support and the section in the span.