不同加载角T形钢管混凝土压弯承载力研究

Study on bearing capacity of T-shaped concrete-filled steel tubular members considering different loading angles

采用有限元软件ABAQUS建立了不同加载角T形带肋和多室钢管混凝土压弯构件的计算模型,数值计算结果与试验结果吻合良好。对影响T形钢管混凝土柱水平荷载P-水平位移Δ关系曲线的参数进行分析,结果表明:加载角为0°时,T形钢管混凝土构件的承载力最低,在67.5°负向加载时,构件的承载力最大,比0°加载角构件大13%左右,加载角为45°~90°间承载力总体上差别不大。随着钢管屈服强度、混凝土抗压强度、钢管长厚比、带肋和多室T形钢管混凝土构件在斜向加载的承载力增加,在传统钢管混凝土基础上,提出了适用于不同加载角带肋和多室T形钢管混凝土压弯构件的承载力设计方法,简化计算公式与有限元结果、试验结果均吻合较好。

The calculation models of stiffened and multi-cell T-shaped CFST compression-bending members at different loading angles were established by using finite element(FE)software ABAQUS.The FE calculated results agreed well with the test results.The parameters affecting the horizontal load P-displacementΔcurves of T-shaped CFST columns were analyzed.The results show that the T-shaped CFST members have the lowest bearing capacity at a loading angle of 0°.The bearing capacity of the members is the largest at 67.5°in a negative direction,which is about 13%higher than that at 0°.In the range of 45°to 90°,the difference in bearing capacity is generally minor.With the increase of steel tube yield strength,concrete compressive strength,steel tube depth-to-thickness ratio,the bearing capacity of stiffened and multi-cell T-shaped CFST members under diagonal loading increases.Based on the traditional CFST,a design method for the bearing capacity of stiffened and multi-cell CFST members considering different loading angles was proposed.The predicted results using the simplified formulas agree well with the FE results and test results.