Research on the Flexural Performance of Light-Gauge Steel Keel-Fiber Cement Pressure Plates
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摘要: 轻钢龙骨-纤维水泥压力板是一种由轻钢龙骨和纤维水泥压力板使用自攻螺钉连接的新型装配式组合楼板构件。相较于传统混凝土现浇楼板具有自重轻、成本低和施工效率高等优点,目前,有关此类楼面板的破坏顺序与破坏特征以及刚度退化等特征的研究尚不深入全面,制约了轻钢龙骨-纤维水泥压力板在村镇钢结构住宅中的推广与应用。为此设计了5组装配式轻钢龙骨-纤维水泥压力板构件,开展了轻钢龙骨-纤维水泥压力板四点抗弯试验研究和有限元建模分析研究,对不同结构构造形式压力板的抗弯性能进行评估并提出设计建议。结果表明,适当减小龙骨间距、增大龙骨截面高度、减小螺钉间距均可有效提高组合楼板屈服荷载与设计承载力。Abstract: The light-gauge steel keel-fiber cement pressure plate is a new type of prefabricated composite floor member formed by connecting a light-gauge steel keel to a fiber cement pressure plate with self-tapping screws. Compared with traditional concrete cast-in-place floors, it has the advantages of light weight, low cost, and high construction efficiency. However, research on the failure sequence, failure characteristics, and stiffness degradation of such building panels is not thorough and comprehensive, which restricts their promotion and application in steel structure houses in villages and towns. To this end, five groups of prefabricated light-gauge steel keel-fiber cement pressure plates were designed. The four-point flexural tests and finite element modeling analyses were carried out on them. The flexural performance of pressure plates with different structural forms was evaluated, and design suggestions were put forward.The results indicated that appropriately reducing the spacing between keels, increasing the section height of keels, and decreasing the spacing between screws could effectively enhance the yield load and design bearing capacity of composite slabs
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