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通过理论推导,得出钢管混凝土构件在复杂应力下的承载力相关方程的基本形式。基于构件等效模型以及单独受力状态下的平衡方程,对复杂受力情况下的钢管混凝土进行受力分析,求出等效桁架中各杆的内力,确定其屈服破坏形态,最后得出屈服方程。利用前面的平衡方程,推导得出各外力间的承载力相关方程。考虑钢管和混凝土之间套箍作用的影响,对承载力相关方程中的各极限承载力项和组合项进行修正。
Through theoretical derivation, the basic form of the correlation equation of bearing capacity of CFST under complex stress is obtained. Based on the equivalent model of the component and the equilibrium equation under the stress alone, the force analysis of the concrete-filled steel tube under complex stress is carried out, and the internal forces of each rod in the equivalent truss are calculated to determine the yield failure mode. Finally, equation. Using the previous balance equation, derive the correlation equation between the bearing capacity of each external force. Considering the influence of the hoop function between the steel pipe and the concrete, the ultimate bearing capacity items and the combination items in the bearing capacity correlation equation are corrected.