混凝土箱梁腹板竖向预应力分析  

Analysis of Vertical Prestress Applied to Webs of Concrete Box Girder

作　　者：施颖[1] 唐苍松 宣纪明[1] 吕颖钊[3] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014 [2]中国联合工程公司,浙江杭州310014 [3]长安大学公路学院,陕西西安710064

出　　处：《桥梁建设》2006年第1期8-11,共4页Bridge Construction

摘　　要：对混凝土箱梁腹板竖向预应力进行研究。以不出现主拉应力和最佳应力比为界限，确定合理竖向预应力值的范围，并给出竖向预应力设计步骤。分析了腹板开裂与否竖向预应力与纵向下弯预应力2种布束方式的优劣。竖向预应力筋合理布置间距建议值为30～50cm。The vertical prestress applied to webs of concrete box girder is studied. Within the limit of ratio of zero principle tensile stre~ to optimal stress of concrete, the range of rational vertical prestress values is determined and design procedures for the prestress are provided. The advantages and disadvantages of two kinds of arrangement for vertical tendons and longitudinal draped tendons are analyzed, disregarding that cracks are to occur or not to occur in the webs, and rational spacing 30-50 cm for arrangement of the vertical tendons is proposed.

关 键 词：箱形梁 竖向预应力 设计 力学分析 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]