钢管混凝土构件受力性能数值研究

分别以钢管混凝土三维有限元法和纤维单元法的应力-应变关系推导出了适于梁单元的应力-应变关系。以这两种方法得到钢管混凝土应力-应变关系,应用于梁单元法进行数值计算,分别对工程中最常出现的钢管混凝土轴压构件及偏压构件进行了计算,并将计算结果与已有的试验结果进行了比较。结果表明:以纤维单元法得到梁单元应力-应变关系在进行钢管混凝土构件数值分析时能取得理想的结果;以三维有限元法得到梁单元应力-应变关系,应用于方截面钢管混凝土构件时计算结果理想,而应用于圆截面钢管混凝土构件时与实验结果相比偏差较大。

Numerical study of concrete filled steel tube structure mechanical behavior

The stress-strain relationships of concrete filled steel tube(CFST) beam element were concluded from the three dimensional finite element method and the fiber element method. The axial loaded and eccentric compression CFST structures were computed through the beam element method with the two types of stress strain relationship deduced. The numerical results were compared with the prior test results. The results showed that the accuracy was good when the stress-strain relationship of CFST concluded from fiber element was used. The results were accurate when the stress strain relation obtained from the three-dimensional finite element method were used in studying square cross section CFST structures, and the numerical result deviate from experimental results when the stress-strain relationship concluded from three dimensional finite element was used in computing circular cross-section CFST structures.