楔形变截面钢管格构柱极限承载力研究

RESEARCH ON ULTIMATE BEARING CAPACITY OF TAPERED STEEL TUBE LACED COLUMN

楔形变截面钢管格构柱在技术和经济上具有明显的优势,在实际工程中应用广泛。理论分析表明,考虑楔率、约束和剪切变形影响后,可将楔形变截面钢管格构柱极限承载力的计算转化为等效的等截面钢管格构柱极限承载力的计算。采用有限元计算分析楔形变截面钢管格构柱楔率影响系数、稳定系数和轴力-弯矩相关曲线,提出楔形变截面钢管格构柱极限承载力的简化算法。简化算法与有限元吻合良好,可供实际工程参考。

Tapered steel tube laced column has advantage on technology and economy, so it is used widely in actual engineering. The ideal solution shows that the ultimate bearing capacity calculation of tapered steel tube laced column can be changed into that of equivalent constant section steel tube laced column by considering tapered rate, constraint condition and influence of shearing deformation. The computing length coefficient which is caused by tapered rate, stability factor and correlation curves between axial force and bending moment of tapered steel tube laced member are analyzed by FEM. The simplified calculation method for ultimate hearing capacity of tapered steel tube laced column is proposed, and results of which meet well with the results of FEM, so the research can provide real engineering with references.