大跨度刚构桥箱梁抗剪承载力影响参数分析

Analysis of Parameters to Shear Capacity of Long-Span Continuous Rigid Girder Bridge

以大跨度连续刚构桥箱梁的中墩附近节段和跨中弯矩变号附近节段为研究对象,建立相关分析模型,开展包括多种剪跨比与不同配箍率、不同腹板纵向普通钢筋配筋率及不同竖向预应力的组合共54种组合分析,得出各参数对抗剪承载力的影响,分析各项因素的抗剪作用和箱梁截面抗剪机理,为桥梁抗剪设计和计算方法提供依据.

Finite element model is established for segments near pier and positive-negative moment point of long-span continuous rigid girder bridge. Shear span ratio, reinforcement and stirrup ratio and prestress ratio have been considered in the model and 54 combinations of these parameters are ana- lyzed. The effects of the parameters on shear capacity and their shear resistant mechanism are gained. The conclusions provides basis for the design of long-span continuous rigid girder bridge and the shear capacity and behavior calculation.