新型钢筋桁架混凝土叠合板力学性能研究

发布时间：2018-03-26 06:48

本文选题：钢筋桁架　切入点：叠合板　出处：《郑州大学》2016年硕士论文

【摘要】：随着我国城市化进程不断深入,建筑产业化是城市发展的必然趋势,装配整体式建筑正符合建筑产业化的要求。自承式钢筋桁架混凝土叠合板已经在装配整体式建筑中运用,在自承式钢筋桁架混凝土叠合板的基础上,通过减少钢筋桁架数目,增加底部受力钢筋数量形成新型钢筋桁架混凝土叠合板,以改善叠合板的经济性及施工便利性。为研究新型钢筋桁架混凝土叠合板的受力和变形性能,完善设计理论,本文对相关规范和文献中的混凝土叠合构件短期刚度计算公式进行归纳整理,同时采用等效惯性矩法推导了新型钢筋桁架混凝土叠合板短期刚度计算公式,通过算例验证了各公式的适用性;利用有限元计算结果完成了本文推导公式的修正,分析了影响新型钢筋桁架混凝土叠合板施工阶段短期刚度的因素;利用有限元方法完成了新型钢筋桁架混凝土叠合板吊装过程分析;根据现行相关规范和有限元方法对新型钢筋桁架混凝土叠合板的使用阶段力学性能进行了分析。经本文研究,主要可得以下结论:相关规范和文献中的混凝土叠合构件短期刚度计算公式经本文算例验证不适合新型钢筋桁架混凝土叠合板的刚度计算,采用等效惯性矩法所直接推导的本文推导公式对叠合板的开裂情况考虑不全面,需要结合开裂情况使用;参数分析表明,施工阶段参数分析中每增加10mm板厚,叠合板底板刚度增加300%,每增加一道桁架或每增加钢筋桁架上弦钢筋直径2mm叠合板刚度增加20%~30%;根据开裂阶段判别标准给出的修正刚度计算公式与有限元计算结果相差在15%以内;吊装分析中得出的吊装方案经有限元分析验证后均满足要求,分析中钢筋与混凝土之间的粘结滑移作用可以不用考虑,但吊绳的作用在建模时需要考虑;使用阶段的极限承载力计算公式计算结果与有限元计算结果误差在10%以内。通过本文的研究,为新型钢筋桁架混凝土叠合板设计分析与工程应用提供了必要的理论基础,研究内容为15G366-1《桁架钢筋混凝土叠合板(60mm厚底板)》的编制提供了必要的依据,研究成果可为新型钢筋桁架混凝土叠合板的进一步推广应用奠定理论基础。
[Abstract]:With the development of urbanization in our country, building industrialization is the inevitable trend of urban development. The assembly integral building is in line with the requirement of building industrialization. The self-supporting reinforced truss concrete composite slab has been used in the assembly integral building. On the basis of self-supporting reinforced truss concrete composite slab, a new type of reinforced truss concrete composite slab is formed by reducing the number of reinforcement trusses and increasing the number of reinforcement bars at the bottom. In order to improve the economy and construction convenience of the composite slab, in order to study the stress and deformation performance of the new reinforced truss concrete composite slab, the design theory is perfected. In this paper, the formulas for calculating the short-term stiffness of concrete composite members in relevant codes and literatures are summarized, and the formula for calculating the short-term stiffness of a new type of reinforced truss concrete composite slab is derived by using the method of equivalent moment of inertia. The applicability of the formulas is verified by an example, and the correction of the formula is completed by using the finite element method, and the factors influencing the short-term stiffness of the new reinforced truss concrete composite slab in construction stage are analyzed. The hoisting process of new reinforced truss concrete composite slab is analyzed by using finite element method, and the mechanical properties of new reinforced truss concrete composite slab are analyzed according to the current relevant codes and finite element method. The main conclusions are as follows: the calculation formulas of short-term stiffness of concrete composite members in relevant codes and literatures are not suitable for the stiffness calculation of new type reinforced truss concrete composite slabs by examples in this paper. The formula derived by the equivalent moment of inertia method in this paper is not fully considered for the cracking of the composite plate and needs to be used in combination with the cracking situation. The parameter analysis shows that every increase in the thickness of the 10mm plate in the construction stage parameter analysis, The stiffness of the laminated slab floor is increased by 300, and the stiffness of each additional truss or superstring steel bar diameter 2mm composite plate is increased by 20%, and the difference between the modified stiffness calculation formula and the finite element calculation result is less than 15% according to the criterion of the cracking stage. The hoisting scheme obtained in the hoisting analysis is verified by finite element analysis. The bond-slip effect between steel bar and concrete in the analysis can not be considered, but the role of hoisting rope should be considered in modeling. The calculation result of ultimate bearing capacity in the stage of use is less than 10% from the result of finite element calculation. Through the research in this paper, it provides a necessary theoretical basis for the design, analysis and engineering application of the new reinforced truss concrete composite slab. The research content provides the necessary basis for the compilation of 15G366-1 (reinforced concrete composite slab 60mm thick floor), and the research results can lay a theoretical foundation for the further popularization and application of the new reinforced concrete composite slab.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU375

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