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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。将钢管混凝土等效为一个空间桁架,钢管与混凝土组成该空间桁架中单个独立的构件。先不考虑套箍作用的影响,应用极限平衡理论,即不管加载历程和变形过程,直接根据结构处于极限状态时的平衡条件算出极限状态时的荷载数值。然后利用各结构元件中的内力与外荷载保持平衡的静力平衡条件,分别建立钢管混凝土结构在单独承受轴力、弯矩、扭矩和剪力作用时的静力平衡方程。
Through theoretical derivation, the basic form of the correlation equation of bearing capacity of CFST under complex stress is obtained. The steel tube concrete is equivalent to a space truss, and the steel pipe and the concrete form a single independent component in the space truss. Regardless of the effect of the hoop, the limit equilibrium theory is applied to calculate the load value at the limit state directly according to the equilibrium condition when the structure is in the limit state regardless of the loading history and the deformation process. Then, the static equilibrium equations of the concrete-filled steel tubular structures subjected to axial force, bending moment, torque and shearing force are respectively established by using the static equilibrium conditions in which the internal forces and the external loads in each structural element are balanced.