论文部分内容阅读
研究钢管混凝土在轴向载荷下的徐变特性涉及两方面 :徐变函数和计算方法。为适合工程应用 ,在徐变分析中采用“迭加法”和 ACI2 0 9- R82密闭混凝土徐变公式 ,就紧箍力的有无分别讨论钢管混凝土的时变特性。计算中采用弹性假设 ,通过离散时间的方法计算由于核心混凝土受载变化导致的徐变情况。在有紧箍力的情况下 ,考虑其在径向和轴向对钢管壁和核心混凝土的作用 ,利用弹性变形可迭加的性质得出徐变的表达式。
Study of CFT under axial load involves two aspects: creep function and calculation method. In order to be suitable for engineering application, the “superposition method” and the ACI2 0 9- R82 closed concrete creep formula are used in the creep analysis to discuss the time-varying characteristics of concrete-filled steel tubular (CFST) with or without the confining force. In the calculation, elastic assumption is used to calculate the creep caused by the change of core concrete load by discrete time method. In the case of tight hoop force, taking into account its radial and axial effects on the steel pipe wall and core concrete, the elastic deformation can be superimposed on the nature of the expression obtained creep.