钢筋混凝土矩形截面柱的矩形基础,其高度 h 由柱与基础交接处冲切条件(在长边方向)确定。即 Kσ_tA_1≤0.75R_eA_2 (1)式中 K——冲切安全系数为2.2;R_e——混凝土抗拉设计强度;σ_t——地基净反力;A_1——冲切面外侧产生剪力的多边形荷载面积; The rectangular foundation of a rectangular column of reinforced concrete has a height h determined by the punching condition (in the direction of the long side) at the junction of the column and the foundation. That is, Kσ_tA_1≤0.75R_eA_2 (1) where K—the safety factor of die-cutting is 2.2; R_e—the tensile strength of the concrete design; σ_t—the net reaction force of the foundation; A_1—the polygon load area that generates the shear outside the blanking plane ;