双偏压双工字型钢混凝土方柱正截面承载力计算

Calculation on Normal Section Bearing Capacity of Square Concrete Column with Cross-H Type Steel Under Biaxial Compression

以纤维法算出不同轴力下双工字型钢混凝土方形柱截面主轴和与主轴任意夹角方向的抵抗弯矩值,以这些数据为基础,用幂函数拟合等轴力时双向偏心受压柱承载力极限曲线,再用三次多项式拟合不同轴力时截面主轴抵抗轴力-弯矩关系,从而得到三维空间的双工字型钢混凝土方形截面双偏压承载力极限曲面.在计算机中建立相应的数据库,可实现双偏压作用下双工字型钢混凝土方柱承载力的快速计算.

Based upon the bending moments of steel reinforced concrete （SRC） section in any angle eccentricity calcu- lated by the fiber method, an exponent fitting method was presented to evaluate the interaction curve at a particular axial load and any angle of eccentricity of SRC columns. A three-order polynomial was used for fitting the relationship between axial load and bending moment. And the critical surface in three-dimensional space was obtained for the SRC section with cross-H type steel under biaxial compression. The corresponding database was set up in computer, so the bearing capacity of the SRC column with cross-H type steel under biaxial compression can be quickly calculated.