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：宋永发[1] 王清湘[1] 宋玉普[1] 

机构地区：[1]大连理工大学土木工程系,辽宁大连116024

出　　处：《大连理工大学学报》2000年第3期348-350,共3页Journal of Dalian University of Technology

基　　金：海岸及近海工程国家重点实验室基金资助项目

摘　　要：通过 1 1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αpρ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 ;计算结果与试验结果吻合较好 .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 index to composite reinforcement index and the conversion reinforcement ratio. The formula of closed bending moments is obtained based on the nominal tension stress. The calculated results agree well with the experimental results.

关 键 词：高强混凝土 裂缝闭合 弯矩 部分预应力混凝土梁 

分 类 号：TU378.201[建筑科学—结构工程]