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目的研究框架组合扁梁正负弯矩区的受力性能.方法在假定计算截面保持平截面的基础上,采用试验研究验证和理论推导的方法,对框架组合扁梁的正负弯矩区进行刚度分析.结果基于换算截面法的假设,通过等效刚度方法,提出了框架深肋组合扁梁等效刚度的计算方法,计算结果表明框架深肋组合扁梁抗弯刚度值与试件跨中挠度为1/400梁跨时的平均刚度值相比,误差小于6.0%,而与试件跨中挠度达1/250梁跨的平均刚度值相比,误差大约为3.0%,且偏于保守.结论试验揭示了内嵌于混凝土楼板之中框架组合扁梁在受力过程中截面的应力、应变的分布规律,验证了平截面假定在进行框架深肋组合扁梁弹性刚度分析时的有效性.
Aim To study the mechanical behavior of positive and negative moment regions of composite flat beam with frame.According to the experimental study and theoretical derivation, Stiffness analysis.Results Based on the assumption of the modified section method, the equivalent stiffness of the deep-rib composite flat-frame with frame is proposed based on the equivalent stiffness method. The calculation results show that the flexural rigidity of the composite deep- The error is less than 6.0% compared with the average stiffness of 1/4 beam, while the error is about 3.0%, which is conservative compared with the average stiffness of 1/250 beam midspan. The test reveals the stress and strain distribution of the cross-section of the flat-frame composite beam embedded in the concrete floor during the stress and validates the validity of the cross-section assumed in the analysis of the elastic stiffness of the flat-beam combined with the deep rib frame.