不等肢配箍矩形截面框架柱双向受剪承载力

通过5根无腹筋和7根有腹筋矩形截面钢筋混凝土框架柱试验，研究低周往复斜向水平荷载作用下不等肢配箍框架柱的双向受剪的机理和计算方法．通过试验分析了无腹筋混凝土框架柱受剪承载力的双向相关性，提出了对混凝土项修正的双向受剪承载力理论．结果表明，无腹筋矩形截面框架柱双向受剪承载力相关关系可以近似用椭圆描述．有腹筋框架柱的受剪承载力中轴压力和两向的箍筋单独作用．根据分析结果，建立了低周往复荷载作用下不等肢配箍矩形截面框架柱的双向受剪承载力计算公式．与试验值比较，双向受剪承载力计算公式用于设计是偏于安全的．

Bilateral Shear Strength of Rectangular Frame Columns With Different Stirrup Areas on Two Principal Axes

The mechanism and calculation method of bilateral shear strength of rectangular frame columns with different stirrup areas on two principal axes under low cyclic oblique horizontal loads were investigated based on a test of 5 rectangular frame columns without stirrup and 7 rectangular frame columns with different stirrup areas on two principal axes. According to the test, the bilateral correlation of shear strength of rectangular frame columns without stirrup was analyzed, and an amendatory theory of shear strength in two directions on concrete was put forward. Results indicate that the relationship of shear strength between two principal axes of rectangular frame columns without stirrup can be approximately described as ellipse. The axial force is independent of the action of stirrups on two principal axes in rectangular frame columns with different stirrups. According to analytical results, a calculation formula of bilateral shear strength of rectangular frame columns with different stirrup areas on two principal axes under low cyclic oblique horizontal loads was presented, which is safe when compared with test results.