预应力组合箱梁抗弯能力计算分析  

CALCULATION AND ANALYSIS ON FLEXURAL CAPACITY OF PRESTRESSED COMPOSITE BOX GIRDER

作　　者：胡少伟[1] 胡汉林[1] 

机构地区：[1]南京水利科学研究院,南京210024

出　　处：《工程力学》2012年第5期101-106,共6页Engineering Mechanics

基　　金：江苏省自然科学基金项目<预应力高强组合箱梁桥复合受力性能分析与设计>(BK2007010);中央级公益性科研院所重大项目<预应力组合箱梁桥复合受力性能与设计理论研究>(Y40705)

摘　　要：预应力钢-混凝土组合梁作为一种新型的横向承重构件,在工程中得到了广泛的使用,准确计算其抗弯承载能力是工程上最为基本也是最重要的要求。该文以弹性分析理论为基础,推导了考虑交界面相对滑移和预应力增量的预应力组合梁弹性承载能力和挠度计算公式;以完全协同作用和平截面假定为前提,采用简化的塑性理论,推导了考虑预应力增量的极限抗弯承载能力计算公式。公式能够反映预应力组合梁的受力特点,计算结果与试验值吻合良好,满足工程精度。The prestressed steel and concrete composite beams having been widely used in engineering as a new transverse bearing component.The bending capacity is one of the most fundamental and important behaviors.The calculation formulas of elastic bearing capacity and deflection were derived considering the slip at the steel-concrete interface and the stress increments of prestressed tendons on the base of the elastic theory;and on the premise of plane section and complete composite action,the expressions of prestressed composite beam＇s ultimate plastic capability which consider the stress increments of prestressed tendons were deduced,based on the simplified plastic theory.These foumulas can reflect the characteristics of the prestressed composite box girder.It turns out that the calculation values are in good agreement with the experimental results,which meet the engineering accuracy.

关 键 词：预应力组合箱梁 抗弯承载力 塑性理论 平截面假定 计算分析 

分 类 号：TU318[建筑科学—结构工程] TU398.9