空、实心钢管混凝土构件复杂受力下统一公式——平衡方程和模型等效

UNIFIED EQUATIONS FOR SOLID AND HOLLOW CONCRETE-FILLED TUBE COLUMNS UNDER COMPLEX STRESS——BALANCE EQUATION AND EQUIVALENT MODEL

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。

This thesis is to obtain the basic form of the strength and stability capacity correlation equations of the concrete filled steel tubular structures under complex stress through the theoretical derivation.It is used the previous CFST equivalent truss model which had been obtained when establishing static equilibrium equations to do mechanical analysis under complex stress.It can be calculated the internal forces of each equivalent truss rod and then determined their yield failure pattern to get yield equation.It is also used the previous balance equation to do computings to offset the internal forces of steel and concrete,in order to obtain the bearing and stability capacity correlation equations.