薄壁钢管轻骨料混凝土轴压短柱承载力分析

Bearing capacity of thin-walled steel tube short columns filled with lightweight aggregate concrete under axial load

运用统一强度理论,考虑中间主应力的影响,引入参数αu,βu确定薄壁钢管在极限荷载时的环向拉应力σθ、纵向压应力σz和径向压应力σr,并考虑轻骨料混凝土与普通混凝土多轴强度准则差异的影响,推导出薄壁钢管轻骨料混凝土轴压短柱的极限承载力公式,并对影响因素进行了分析。将本文计算结果与文献试验数据进行比较,结果吻合良好,表明将统一强度理论运用于薄壁钢管轻骨料混凝土轴压短柱承载力计算是可行的。该结果为薄壁钢管轻骨料混凝土的优化设计提供了一定的理论依据。

Based on the unified strength theory, considering the effects of the intermediate principal stress and the differences of the multi-axial strength criterion for the lightweight aggregate concrete and common concrete, by introducing parameter αu and/βu, loop tensile stress σθ , longitudinal compressive stress σ, and radial compressiye stress σ of the thin- walled steel tube in ultimate bearing condition were obtained. Thus the calculation formula of ultimate bearing capacity of thin-walled steel tube short columns filled with lightweight aggregate concrete was deduced, and the influence complication was analyzed. Compared with the obtained solution and the test results in reference, good agreement can be found. The results indicate that the unified strength theory has the good applicability in the calculation of ultimate bearing capacity of thin-walled steel tube short columns filled with lightweight aggregate concrete. The results can provide theoretical foundation for the design of thin-walled steel tube filled with lightweight aggregate concrete.