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基于板梁理论,对均布荷载作用下的双轴对称工字形钢—混组合双跨连续梁进行弯扭屈曲分析,推导截面连续梁发生弯扭屈曲时的临界弯矩公式,运用ANSYS有限元软件对10根双轴对称工字形钢—混组合双跨连续梁进行特征值屈曲分析,对比屈曲临界弯矩的数值解与理论解,讨论换算截面法的适用性。结果表明:理论解与有限元解之间具有较高的吻合度,最大误差不超过3%。换算截面法的计算结果与实际结果差别较大,并不适用于工字形钢—混组合连续梁弯扭屈曲问题的计算。
Based on the slab beam theory, the torsional-torsional buckling analysis of biaxial symmetrical H-shaped steel-concrete composite double-span continuous beams under uniform load is carried out. The critical moment formula for buckling of continuous section beams is deduced. The ANSYS finite element method The eigenvalue buckling analysis of 10 biaxial symmetrical steel-concrete composite double-span continuous beams is carried out. The numerical solution and theoretical solution of the critical moment of buckling are compared. The applicability of the modified section method is discussed. The results show that there is a good agreement between theoretical solution and finite element solution, and the maximum error is less than 3%. The calculated results of the cross section method are quite different from the actual results and are not suitable for the calculation of bending and torsional buckling of the H-shaped continuous beams.