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为使自重较重的钢筋混凝土材料能够在大跨度楼盖中得到合理应用,对变厚度中空板进行分析研究。变厚度板是指将板带的截面由矩形转变为T形,且薄板与厚板高度之比满足h′/h≥0.45,当T形板带跨中截面达到承载能力极限状态时,厚板和薄板的受压区高度相等,其纵向受拉钢筋均能达到抗拉设计强度。支座截面达到承载能力极限状态时,薄板的上下钢筋也均能达到抗拉设计强度,充分发挥了薄板中钢筋的作用。同时给出了变厚度板的强度、冲切、裂缝宽度及挠度的计算方法,并将研究成果应用于工程实践,在满足规范要求的同时,相对于梁板体系,减小了结构高度,相对于无梁楼盖体系,减少了材料用量,取得较好的经济性,可供设计大跨度楼盖时参考。
In order to make the heavier weight of reinforced concrete materials in the long-span floor can be reasonably applied, the hollow plate of variable thickness is analyzed. The variable thickness plate refers to the section of the strip is changed from rectangle to T shape, and the ratio of the height of the thin plate to the thick plate satisfies h '/ h≥0.45. When the cross section of the T-shaped plate reaches the ultimate bearing capacity, And the compression zone of sheet metal height equal to its longitudinal tensile strength can reach tensile design strength. When the bearing cross-section reaches the ultimate bearing capacity, the tensile strength of the upper and lower plates can also reach the tensile strength, giving full play to the role of rebar in the thin plate. At the same time, the calculation methods of the strength, punching, width and deflection of the variable thickness plate are given. The research results are applied to the engineering practice. While meeting the requirements of the code, the structure height is reduced compared with the beam plate system. In the non-beam floor system, reducing the amount of material, to obtain better economy, for the design of large-span floor reference.