The research in this paper presents investigation on the load bearing capacity of fame composite slim beam with deep deck and proposes one calculation method of flexural stiffness. Based on the classical Euler-Bernoulli theory,a formula to calculate the flexural stiffness of composite slim beams with deep deck is proposed by the method of equivalent cross-section as well on the principle of equivalent stiffness and the feasibility of the formula is testified by the experimental results. The error between the calculation results and test results is less than 6. 0% when the deflection at mid-span reaches 1/400 of the beam span,and turns to be less than 3. 0% when the deflection at mid-span reaches 1/250 of the beam span and the calculation results is conservative. The flexural behavior of composite slim beams and the strain distribution of sections have been investigated by experimental test. The results indicate that the deformation of the beam section remains plan during the elastic stage.%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.
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