【摘要】 笔者对为青藏线设计的 32m铁路预应力活性粉末混凝土单箱单室箱梁进行了有限元分析 ,对其剪力滞分布规律进行了研究 ,并且分析了不同工况对梁剪力滞效应的影响。分析结果表明预应力活性粉末混凝土箱梁具有一定的剪力滞效应 ,剪力滞系数在 1.0～ 1.1之间。笔者得到的结果可以为今后活性粉末混凝土梁的设计提供参考 ,这对于加速箱梁剪力滞理论的深入研究 ,为大跨、新型桥梁结构的性能评价提供正确的分析有一定的参考价值。更多还原

【Abstract】 The shear lag of a 32 m reactive powder concrete single-box and single-cell bridge designed for Qing-Zang railway is analyzed by 3-dimensional finite element method and the impacts of different loading arrangements on its shear lag are discussed. The results indicate that pre-stressed reactive powder concrete box-girder exhibits shear lag effect, the shear lag coefficient is about 1.0～1.1. The results obtained could be referred in designing reactive powder concrete bridge. It is useful for further study of the shear lag theory of box girders, and may provide references for accurate analysis in estimate of the actual performance of new type bridge with long or medium span.更多还原