Abstract: Nowadays the concrete-filled steel tube construction is gradually used in civil engineering. The computation theory of the concrete-filled steel tube is being researched by engineers and other scholars. This construction is the composite material construction. The shrinkage of the core concrete can produce the cross-sectional internal force redistribution. When the core concrete shrinks its creep will take place. The computation of the shrinkage internal force must include the creep of core concrete. This paper puts forward a computation method of the cross-sectional internal force of the concrete-filled steel tube construction that is produced by the core concrete shrinkage. This method meantime considers the concrete creep. The method is considerably simple and easy. The results of computation show that the redistributed internal force is considerably large. This method can be used in the cross-sectional internal force redistribution computation of concrete-filled steel tube arch bridges that is produced by the concrete shrinkage.

Key words: concrete-filled steel tube, shrinkage, creep, internal force redistribution, useful simplified computation

摘要： 钢管混凝土结构在土木工程中得到了越来越多的应用,因此其计算理论日益引起了工程界人士的重视。钢管混凝土结构属于组合材料结构,其核心混凝土的收缩将引起截面的内力重分布,混凝土在收缩时徐变随着同时发生,本文提出了钢管混凝土柱在考虑徐变的情况下其核心混凝土的收缩所产生的截面内力重分布的计算方法,该方法简单实用,易于掌握。计算结果表明,钢管混凝土柱由于混凝土收缩产生的截面内力重分布值较大,设计时应该予以足够的重视。本文所提出的方法亦可近似用于钢管混凝土拱桥由于混凝土收缩所产生的截面内力重分布计算。

关键词: 钢管混凝土, 收缩, 徐变, 内力重分布, 实用简化计算