钢筋桁架式夹芯混凝土板优化设计与受力性能分析
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摘要
钢筋桁架式夹芯混凝土板是一种新型的楼板结构,它具有重量轻、强度高、施工装配化、产品工厂化的特点,适用于多高层钢结构住宅体系。该楼板符合目前钢结构住宅楼板体系的发展趋势,是值得大力推广的楼板形式。
本文从研究钢结构住宅的楼板体系出发,对国内外现阶段钢结构住宅的各种楼板形式进行介绍,并将钢筋桁架式夹芯混凝土板与它们进行综合对比。在钢结构桁架设计的理论基础上,对钢筋桁架式夹芯混凝土的受力骨架一钢筋桁架进行设计,确定钢筋桁架的形式,分析包括钢筋直径、桁架高度、支撑桁架榀数、桁架截面形式等影响钢筋桁架性能的主要参数,并运用灰局势决策对钢筋桁架进行优化选型,确定钢筋桁架的最优形式。
研究钢筋桁架式夹芯混凝土板的整体受力性能,进行开裂状态以及极限状态的内力分析与理论计算。运用两种不同的方法推导出钢筋桁架式夹芯混凝土板的开裂弯矩公式,提出开裂弯矩的简化公式,将三者进行对比分析。结合工程实际,推导出极限弯矩的理论公式与简化公式。建立钢筋桁架式夹芯混凝土板的有限元模型,得出开裂弯矩与极限弯矩的有限元分析值,将其与理论公式值进行对比与验证。并且通过对钢筋桁架式夹芯混凝土板模型在受弯状态下的分析,得出较为合理的板型。
最后,通过对钢筋桁架式夹芯混凝土板方案、叠合板方案、组合板方案、现浇板方案各方面性能进行了比较,得出由钢筋桁架式夹芯混凝土板为楼板体系的钢结构住宅在经济成本、受力性能、抗震性能、变形性能方面都具有一定的优势。
Truss-type sandwich reinforced concrete slab is a new type of floor structure. It has the characteristics of light weight, high strength, assembly of construction and industrial product, so it is applicable to the steel residential structure system with more and high-rise floors. Steel slab is consistent with the current development trend of the residential floor system, and it will be a promote floor structure.
Starting from the floor structure system of steel residential structure, floor forms of steel residential structure system at home and abroad at present were introduced and studied in this paper, and between these floor forms and truss-type sandwich reinforced concrete slab, a comprehensive comparison was made. Based on the design theories of steel truss, the force skeleton of truss-type sandwich reinforced concrete—steel truss was designed, the form of steel truss was determined. The main parameters, including bar diameter, height of truss, Pin number of supporting truss, section form of truss and so on, which have influence on the behavior of steel bar truss were analyzed. Moreover, grey situation decision-making was used to optimize the selection of steel truss and the optimal form of steel trusses was fixed.
The whole structural performance of truss-type sandwich reinforced concrete slab was studied and internal force analysis and theoretical calculations of the ultimate state and cracking state were done. Cracking moment formula of truss-type reinforced concrete sandwich slab was deduced through two different methods, and a simplified cracking moment formula was proposed. Then these three formulas were analyzed. Combined with the actual project, the theoretical formula and simplified formula of ultimate moment were deduced. Established the finite element model of truss-type sandwich reinforced concrete slab and calculated the value of finite element analysis of cracking moment and ultimate moment. Then the contrast and verifying between the value of finite element analysis and the value derived of theoretical formula was done. In addition, a more reasonable slab form was got through the analysis of truss-type sandwich reinforced concrete slab model under bending state.
Finally, the performance of truss-type sandwich reinforced concrete slab project, superimposed slab project, composite slab project and cast-in-place slab project were compared. Through comparison, a conclusion was drawn: steel residential structure with truss-type sandwich reinforced concrete slab floor system has advantages in the aspects of economic cost, loaded behaviors, seismic behaviors and deformation behaviors.
本文从研究钢结构住宅的楼板体系出发,对国内外现阶段钢结构住宅的各种楼板形式进行介绍,并将钢筋桁架式夹芯混凝土板与它们进行综合对比。在钢结构桁架设计的理论基础上,对钢筋桁架式夹芯混凝土的受力骨架一钢筋桁架进行设计,确定钢筋桁架的形式,分析包括钢筋直径、桁架高度、支撑桁架榀数、桁架截面形式等影响钢筋桁架性能的主要参数,并运用灰局势决策对钢筋桁架进行优化选型,确定钢筋桁架的最优形式。
研究钢筋桁架式夹芯混凝土板的整体受力性能,进行开裂状态以及极限状态的内力分析与理论计算。运用两种不同的方法推导出钢筋桁架式夹芯混凝土板的开裂弯矩公式,提出开裂弯矩的简化公式,将三者进行对比分析。结合工程实际,推导出极限弯矩的理论公式与简化公式。建立钢筋桁架式夹芯混凝土板的有限元模型,得出开裂弯矩与极限弯矩的有限元分析值,将其与理论公式值进行对比与验证。并且通过对钢筋桁架式夹芯混凝土板模型在受弯状态下的分析,得出较为合理的板型。
最后,通过对钢筋桁架式夹芯混凝土板方案、叠合板方案、组合板方案、现浇板方案各方面性能进行了比较,得出由钢筋桁架式夹芯混凝土板为楼板体系的钢结构住宅在经济成本、受力性能、抗震性能、变形性能方面都具有一定的优势。
Truss-type sandwich reinforced concrete slab is a new type of floor structure. It has the characteristics of light weight, high strength, assembly of construction and industrial product, so it is applicable to the steel residential structure system with more and high-rise floors. Steel slab is consistent with the current development trend of the residential floor system, and it will be a promote floor structure.
Starting from the floor structure system of steel residential structure, floor forms of steel residential structure system at home and abroad at present were introduced and studied in this paper, and between these floor forms and truss-type sandwich reinforced concrete slab, a comprehensive comparison was made. Based on the design theories of steel truss, the force skeleton of truss-type sandwich reinforced concrete—steel truss was designed, the form of steel truss was determined. The main parameters, including bar diameter, height of truss, Pin number of supporting truss, section form of truss and so on, which have influence on the behavior of steel bar truss were analyzed. Moreover, grey situation decision-making was used to optimize the selection of steel truss and the optimal form of steel trusses was fixed.
The whole structural performance of truss-type sandwich reinforced concrete slab was studied and internal force analysis and theoretical calculations of the ultimate state and cracking state were done. Cracking moment formula of truss-type reinforced concrete sandwich slab was deduced through two different methods, and a simplified cracking moment formula was proposed. Then these three formulas were analyzed. Combined with the actual project, the theoretical formula and simplified formula of ultimate moment were deduced. Established the finite element model of truss-type sandwich reinforced concrete slab and calculated the value of finite element analysis of cracking moment and ultimate moment. Then the contrast and verifying between the value of finite element analysis and the value derived of theoretical formula was done. In addition, a more reasonable slab form was got through the analysis of truss-type sandwich reinforced concrete slab model under bending state.
Finally, the performance of truss-type sandwich reinforced concrete slab project, superimposed slab project, composite slab project and cast-in-place slab project were compared. Through comparison, a conclusion was drawn: steel residential structure with truss-type sandwich reinforced concrete slab floor system has advantages in the aspects of economic cost, loaded behaviors, seismic behaviors and deformation behaviors.
引文
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