体内体外混合预应力配束连续刚构桥力学性能对比分析  

Comparative Analysis of the Mechanical Properties of the In-vivo and In-vitro Mixed Prestressed Continuous Rigid Frame Bridge

作　　者：陶庆东[1,2] 刘跃国[1] 

机构地区：[1]绵阳职业技术学院建筑工程系,四川绵阳621000 [2]重庆交通大学土木建筑学院,重庆400074

出　　处：《施工技术》2017年第2期63-68,共6页Construction Technology

基　　金：四川省教育厅项目(15ZB0409;16ZB0462)

摘　　要：以重庆新滩大桥体内体外混合配束连续刚构桥为工程实例,运用有限元软件分析其左幅全体内预应力与右幅体内体外混合配束的受力特点,并对比左右幅桥梁相同位置处的剪应力、经济性及工程实用性,得到连续刚构桥的体内体外混合配束的特点及优势,进而探讨采用优化配置的纵向体内体外预应力钢束取代竖向预应力筋来承担混凝土的主拉应力的可行性,避免由于竖向预应力的施工质量难以保证,使成桥后主梁易出现混凝土开裂等病害。Taking Chongqing Xintan continuous rigid frame bridge with mixed beam in-vivo and in-vitro as an engineering example, the stress characteristics that the left in-vivo bridge and the right mixed beam in-vivo and in-vitro bridge were analyzed with the finite element software, and the left and right bridge＇ s shear stress, economical efficiency and engineering practicability at the same position were compared, by which the characteristics and advantages of mixed beam in-vivo and in-vitro of continuous rigid frame bridge were obtained. Then the feasibility of using the optimized configuration of the longitudinal in-vivo and in-vitro prestressed steel beam to replace the vertical prestressed reinforcement to bear the main tensile stress of concrete was discussed, which avoided the diseases of the main beam concrete cracking because of the difficulty of the vertical prestress construction quality.

关 键 词：桥梁工程 预应力 连续刚构桥 有限元分析 

分 类 号：U445[建筑科学—桥梁与隧道工程]