This paper presents a new type of composite slim floor beam, determined by combining the results of an experimental study and theoretical analysis of the ultimate flexural strength of slim floor beams. The shear connectors play a significant role in the mechanical properties of this type of composite slim floor beam, because the precast concrete slab is laid on the bottom flange of the steel section and because the upper portion of the steel beam is encased in the cast-in-place concrete slab. To investigate the ultimate flexural strength, three specimens, which included headed studs, transverse steel bar shear connectors and no shear connectors, were tested. Additionally, a detailed numerical analysis was performed to verify the experimental results, which indicated that a higher-strength steel beam and thicker concrete slab can effectively enhance the stiffness and flexural capacity of the composite slim floor beam. Based on plastic mechanics and limit analysis theory, a calculation method was derived to estimate the ultimate flexural strength of a composite slim floor beam, and a comparison between the calculation and experimental results shows that the theoretical results exhibit good agreement with the experimental results, and the proposed analysis method can be used in future studies to gain a better understanding of the ultimate flexural strength of composite slim floor beams.

本文介绍了一种新型的复合型超薄楼板横梁，它是通过将实验研究结果和超薄楼板横梁的极限抗弯强度的理论分析相结合而确定的。剪力连接件在这种类型的复合超薄楼板梁的机械性能中起着重要作用，因为预制混凝土板放置在钢型材的底部法兰上，并且钢梁的上部包裹在铸钢结构中。就地混凝土板。为了研究极限抗弯强度，测试了三个样品，包括带头螺栓，横向钢筋剪切连接器和无剪切连接器。此外，还进行了详细的数值分析以验证实验结果，这表明，高强度的钢梁和较厚的混凝土板可以有效地提高复合超细楼板梁的刚度和抗弯能力。基于塑性力学和极限分析理论，推导了一种计算复合材料薄楼板梁极限抗弯强度的计算方法，与计算结果和实验结果的比较表明，理论结果与实验结果吻合良好，所提出的分析方法可用于未来的研究中，以更好地理解复合超细楼板梁的极限抗弯强度。