PC梁桥长束纵向预应力筋优化布置研究  

Research on the Optimal Design of Long Longitudinal Prestressed Reinforcement Layout for PC Bridge

作　　者：张开银[1,2] 殷亮[1,2] 惠国旺 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]水路公路交通安全控制与装备教育部工程研究中心,武汉430063 [3]新疆公路规划勘察设计研究院,乌鲁木齐830006

出　　处：《交通科技》2009年第1期5-8,共4页Transportation Science & Technology

基　　金：交通部科技项目(200731822330)

摘　　要：针对目前结构设计中影响纵向预应力损失的主要因素,优化大跨径PC梁桥长束纵向预应力束为较短束,以减小预应力张拉过程中产生的摩阻损失,提高悬臂施工过程中箱梁根部预应力储备,改善成桥后的应力状态,增强L/4截面混凝土的抗剪能力。According to main factor of longitudinal prestress loss during the structure design at pres- ent, this paper changed the long strand of the longitudinal prestress into a short one in long-span PC bridge. By this optimal design the friction loss would be reduced obviously in the stretching process and the prestress reserve in the root of the box girder would be enhanced during the cantilever con- struction stage. Meanwhile, with this method the stress state of long-span PC bridge can be improved when being built up and the shear capability in L/4 section can be strengthened effectively. In a word, this article promotes a new design idea for long-span PC bridge during the longitudinal prestress design.

关 键 词：预应力混凝土 预应力优化 摩阻损失 

分 类 号：TU378[建筑科学—结构工程] TF341.6[冶金工程—冶金机械及自动化]