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在计算楼盖结构内力和挠度时,可用拟梁法考虑梁板的协同工作。为了验证拟梁法的可靠性,应用SAP2000对6 m×6 m的单区格现浇混凝土双向板分别用有限元方法和拟梁法进行分析对比,拟梁数量由5根变化到10根。分析结果表明,与有限元法计算结果相比,当拟梁数量为5根时,用拟梁法计算所得的板跨中弯矩误差为7.2%,支座弯矩误差为12.48%,跨中挠度误差为4.1%;当拟梁数量为10根时,用拟梁法计算所得的板跨中弯矩误差17.56%,支座弯矩误差11.75%,跨中挠度误差为5.2%。直接用拟梁法计算混凝土双向板内力和挠度会产生较大误差,工程设计时应慎重使用。
When calculating the internal force and deflection of the floor structure, the quasi-beam method can be used to consider the cooperation of the beam plates. In order to verify the reliability of the pseudo-beam method, the application of SAP2000 on the 6 m × 6 m single-zone cast-in-place concrete two-way slab were analyzed and compared using finite element method and quasi-beam method, the number of quasi-beam changed from 5 to 10. The analysis results show that compared with the finite element method, when the number of quasi-beams is five, the bending moment error calculated by the quasi-beam method is 7.2% and the bending moment error is 12.48% The deflection error is 4.1%. When the number of quasi-beams is 10, the bending moment error calculated by the quasi-beam method is 17.56%, the bearing moment error is 11.75% and the mid-span deflection error is 5.2%. Calculating the internal force and deflection of concrete two-way slab directly by the method of quasi-beam will produce a big error, and the engineering design should be used with caution.