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钢骨混凝土柱结构在过去几十年间已得到广泛的运用。但是目前关于这种柱结构在长期荷载作用下由于徐变和收缩引起的与时间相关的力学性能研究还开展得很少。该文开展了钢骨混凝土短柱的长期轴向荷载试验研究,还进行了这些柱的极限承载力破坏试验。试验监测了由徐变和收缩引起的柱的轴向长期变形。基于该实测曲线的分析表明,采用ACI 209R-92的收缩模型和CEB-FIP90的徐变模型,利用龄期调整有效模量法可以较好地模拟钢骨混凝土柱在长期轴向荷载作用下的变形发展。经历了长期加载后的试验柱的极限承载力破坏试验还表明,长期轴向荷载对柱的轴压承载力没有显著影响。
Steel-concrete column structures have been widely used in the past few decades. However, little research has been done on the time-dependent mechanical properties of such column structures due to creep and shrinkage under long-term loads. In this paper, the long-term axial load tests of SRC stubs are carried out and the ultimate bearing capacity failure tests of these columns are also carried out. The test monitored long-term axial deformation of the column caused by creep and shrinkage. The analysis based on the measured curve shows that using the shrinkage model of ACI 209R-92 and the creep model of CEB-FIP90, the age-adjusted effective modulus method can well simulate the effect of long-term axial load on SRC columns Deformation development. The ultimate bearing capacity failure test of the test column subjected to long-term loading also shows that long-term axial load has no significant effect on the column axial bearing capacity.