无粘结部分预应力高强混凝土梁闭合弯矩计算  

Calculation of Closed Bending Moments for Unbonded Partially Prestressed Concrete (PPC) Beams with High Strength Concrete

作　　者：冉康 

机构地区：[1]阜阳恒昌商品混凝土有限责任公司,安徽阜阳236018

出　　处：《淮南职业技术学院学报》2004年第1期53-55,共3页Journal of Huainan Vocational Technical College

摘　　要：通过 11根无粘结部分预应力高强混凝土梁 ,研究了影响裂缝闭合的主要因素 ;预应力筋配筋率、非预应力筋配筋率、跨高比、荷载作用方式 ,用无粘结配筋指标 βpe 和换算配筋率αpp 这两个参数来反映对裂缝闭合弯矩的影响 ,应用名义拉应力建立了闭合弯矩计算公式 ;Based on the experimental results of 11 unbonded partially prestressed concrete (PPC) beams with high-strength concrete, the major factors which affect the closed bending moments of unbonded beams are studied. The effect of prestressed and non prestressed reinforcement on deflection in the mid-span of unbonded beams and loading behavior is reflected with the ratio of unbonded reinforcement to composite reinforcement index and the conversion reinforcement ratio. The formula of closed bending moments is obtained on the nominal tension stress. The calculated results agree well with the experimental results.

关 键 词：预应力高强混凝土 梁 弯矩 无粘结 裂缝闭合 名义拉应力 部分预应力混凝土结构 

分 类 号：TU378.8[建筑科学—结构工程] TU375.1