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在现浇混凝土空心板现有抗弯刚度计算方法的基础上,借助大型有限元程序ANSYS,对空心板两个方向抗弯刚度折减系数进行了理论分析,结果表明,d/h和tw/d是主要影响因素,且d/h影响显著,tw/d次之。平行于管轴方向的抗弯刚度大于垂直于管轴方向的抗弯刚度;应用数理统计软件SPSS对数据进行非线性回归,给出了空心板抗弯刚度折减系数的近似计算公式和空心板两个方向的抗弯刚度的计算方法。最后,ANSYS通用有限元程序对算例的计算结果的验证表明,给出的抗弯刚度计算方法的误差均在2%左右,比传统的抗弯刚度计算方法精确得多。
Based on the existing calculation method of flexural rigidity of cast-in-situ concrete hollow slab and the finite element program ANSYS, the reduction factors of flexural rigidity of hollow slab in both directions are theoretically analyzed. The results show that d / h and tw / d is the main influencing factor, and d / h significant impact, tw / d second. The bending stiffness parallel to the tube axis is greater than the bending stiffness perpendicular to the tube axis. The mathematical regression software SPSS is used to carry out the nonlinear regression and the approximate calculation formula of the bending stiffness reduction coefficient of the hollow slab is given. Calculation of Bending Stiffness in Two Directions. Finally, the ANSYS general finite element program verifies the calculation results of the examples. The results show that the error of the calculation method of the bending stiffness is about 2%, which is much more accurate than the traditional calculation method of the bending stiffness.