不同加载角度下T形带肋和多室钢管混凝土构件受弯性能研究

为研究不同加载角度下T形带肋和多室钢管混凝土构件的纯弯性能,以加载角度(0°、63°、90°、117°和180°)为试验参数,进行了 11个T形钢管混凝土构件(包括5个带肋、5个多室和1个无肋)的纯弯试验,获得了破坏形态、弯矩-挠度曲线、应变、受弯承载力和抗弯刚度.建立了不同加载角度下T形构件有限元模型,考虑了残余应力...

Flexural behavior of stiffened and multi-cell T-shaped CFST members with different loading angles

In order to study the flexural behavior of stiffened and multi-cell T-shaped concrete-filled steel tubular (CFST) members with different loading angles, a total of eleven specimens (including five stiffened, five multi-cell and one unstiffened specimens) with different loading angles (0°, 63°, 90°, 117° and 180°) were tested under pure bending. The failure mode, bending moment-deflection curve, strain, flexural capacity and flexural stiffness were obtained. A finite element model of T-shaped members with different loading angles was developed, considering the residual stress and cold-formed effect. The calculated results agreed well with the test results. A parametric study on flexural capacity was performed. The simplified formulas on flexural capacity of stiffened and multi-cell T-shaped CFST members with different loading angles were proposed based on the flexural capacity with loading angle of 0°. The results show that the stiffened and multi-cell T-shaped CFST members exhibit good flexural behavior at different loading angles. The loading angle has a certain influence on the flexural capacity of T-shaped members and the variation is generally less than 14%. The members show the lowest flexural capacity with the loading angle of near 112.5°. Setting longitudinal stiffeners and using multi-cell cross-section can enhance the flexural capacity of T-shaped CFST members by about 11% and 26%, respectively. The multi-cell members show higher flexural capacity than the stiffened members. The initial flexural stiffness is not affected by residual stress and cold-formed effect, while the flexural capacity is increased by more than 7% with considering the cold-formed effect.