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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 .
The main factors affecting the closure of cracks were studied by 11 unbonded partially prestressed high-strength concrete beams: prestressed reinforcement ratio, non-prestressed reinforcement ratio, cross-ratio ratio and load mode. Reinforcement index βpe and converted reinforcement ratio αpρ are two parameters to reflect the impact on the crack closing moment. The formula of the closed moment is established by using the nominal tensile stress. The calculation results are in good agreement with the experimental results.