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为了研究钢管初应力对钢管混凝土拱肋极限承载力的影响,针对实际工程中普遍采用的哑铃型钢管混凝土拱肋,考虑中间主应力、材料拉压比、初应力、初始缺陷、矢跨比和长细比等因素的影响,采用统一强度理论和修正的等效梁柱法,推导出一个新的初应力影响系数的计算公式,并建立其极限承载力的统一解。应用提出的计算公式分别对有、无初应力的哑铃型钢管混凝土拱肋的极限承载力进行计算,并将无初应力拱肋的计算结果与相关文献的试验结果及计算结果进行对比。分析结果表明:所提出的计算公式具有较好的精确度,验证了该计算方法的可行性;研究结果可为工程应用提供参考。
In order to study the influence of initial stress of steel tube on the ultimate load-carrying capacity of CFST arch ribs, aiming at the dumbbell-shaped CFST arch rib commonly used in practical engineering, considering the middle principal stress, material tension-compression ratio, initial stress, initial defect, Slenderness ratio and other factors. Using the unified strength theory and the modified equivalent beam-column method, a new formula for calculating the initial stress influence coefficient is derived and a unified solution to the ultimate bearing capacity is established. The formulas of the proposed formulas were used to calculate the ultimate bearing capacity of dumbbell-shaped CFST arch with and without initial stress respectively. The calculation results of the no-stress rib were compared with those of the related literatures. The analysis results show that the proposed calculation method has better accuracy and verifies the feasibility of the calculation method. The research results can provide reference for engineering application.