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采用双剪统一强度理论,考虑中主应力和材料拉压比的影响,全面地考虑钢管、腹板、钢管内混凝土和腹腔内混凝土对构件极限承载力的贡献,同时,考虑钢管和腹板对混凝土的约束作用,引入哑铃型截面考虑长细比、偏心率和初应力影响的折减系数,推导出哑铃型钢管混凝土柱的极限承载力公式,并对影响参数进行分析。将计算结果与试验结果及相关文献的计算结果进行对比,吻合良好,验证了公式的合理性。
Considering the influence of middle principal stress and material tension-compression ratio, the contribution of concrete in steel pipe, web, pipe and intraperitoneal cavity to the ultimate bearing capacity of the member is considered. Meanwhile, considering the relationship between steel pipe and web The restraint effect of concrete is introduced into the dumbbell-shaped cross-section. The ultimate bearing capacity formula of dumbbell-shaped concrete-filled steel tubular column is derived considering the slenderness ratio, eccentricity and the reduction factor of initial stress, and the influence parameters are analyzed. The calculation results are compared with the test results and the calculation results of the related documents. The results are in good agreement with each other to verify the rationality of the formula.