【摘要】 以构件截面尺寸和截面形式为基本参数,进行了钢管高性能混凝土柱水泥水化阶段构件截面温度场和核心混凝土收缩性能的实验研究,考察了水泥水化阶段钢管混凝土构件温度场及其核心混凝土的收缩特性。研究结果表明,钢管高性能混凝土构件截面温度场的变化规律与普通混凝土类似,但钢管混凝土中核心混凝土的收缩变形远小于素混凝土的收缩变形。在实验研究结果的基础上,通过对ACI209(1992)提供的普通混凝土收缩模型的修正,提出了适合钢管混凝土中核心混凝土收缩变形的计算公式。更多还原

【Abstract】 The temperature field during cement hydration,and the shrinkage of the core concrete in high performance concrete-filled steel tubes are experimentally studied in this paper.The main parameters studied are sectional dimensions and sectional types.The observed results show that the temperature field in high performance concrete-filled steel tubes is similar to that of ordinary concrete members.However,the shrinkage value of concrete in high performance concrete-filled steel tubes is significantly lower than that of plain concrete.Based on the measured results,concrete shrinkage model proposed by ACI 209(1992) specifications was modified.Moreover,a formula for calculating the shrinkage of core concrete in high performance concrete-filled steel tubes is suggested.更多还原