方钢管桁架组合楼板的受弯性能研究
发布时间：2018-11-19 10:26
【摘要】：压型钢板—混凝土组合楼板和钢筋桁架组合楼板虽已广泛应用,但现场湿作业工作量较大,无法实现建筑装配化施工,同时由于楼板质量较大,不利于结构抗震与降低基础造价。因此,近年来关于轻质装配式组合楼板的研究备受关注,本文提出了一种方钢管桁架组合楼板形式,由薄壁方钢管弦杆、钢筋腹杆组成的空间桁架体系作为主要受力结构,上下表面由混凝土面层构成,内部空间填充具有保温隔声作用的苯板。该组合楼板可在工厂预制生产,重量较轻,无需特殊的防火防锈处理,符合装配式建筑的发展趋势。为考察这类新型组合楼板的受弯性能,本文开展了以下具体研究工作:1.进行了11个足尺方钢管桁架组合楼板的受弯性能试验,楼板长度分别为3m、4.5m和6m。试验结果表明:组合楼板的受弯过程分为底部混凝土开裂、下弦方钢管受拉达到屈服强度、钢框架端部腹杆屈曲破坏三个阶段,最终的破坏形式均为腹杆屈曲变形过大导致试件失去整体承载力。楼板的刚度和承载力能够满正常使用状态和承载能力极限状态的要求,并且峰值承载力较高,具有足够的安全储备。2.采用有限元软件ABAQUS对组合楼板的受弯性能进行了精细化有限元模拟分析。模拟所得荷载-位移曲线与试验结果整体吻合较好。参数分析发现,增强端部腹杆可以有效避免试验中发现的腹杆屈曲导致试件破坏的问题,且可同时提高楼板的承载力。采用线性摄动对楼板自振频率的分析表明,楼板的自振频率均远大于5Hz,可满足规范对正常使用时舒适性的要求。3.基于本文试验结果,对普通混凝土双筋梁的计算方法进行了修改和优化,提出了组合楼板的开裂弯矩和极限承载力的理论计算公式。根据组合楼板的构造对《混凝土结构设计规范》(GB50010-2010)中关于裂缝宽度及刚度的计算公式进行了修改,建立了适合组合楼板的最大裂缝宽度及刚度计算公式。所提各计算公式的理论计算值与试验结果的误差较小,验证了本文所提出的开裂弯矩公式及极限承载力公式的正确性和可靠性。最后基于试验和分析的结果,对楼板的进一步优化提出了设计构造建议。
[Abstract]:Although composite slabs of profiled steel and concrete and steel truss composite slabs have been widely used, but the work of wet work on the spot is too heavy to realize the construction assembly construction, at the same time, because of the high quality of floor, It is unfavorable to the earthquake resistance of structure and the reduction of foundation cost. Therefore, in recent years, the research on lightweight assembled composite slabs has attracted much attention. In this paper, a kind of square steel tube truss composite floor form is proposed, which is composed of thin-walled square steel tube chords and steel webs as the main force structure. The upper and lower surfaces are made up of concrete surfaces, and the inner space is filled with benzene panels with insulation and sound insulation. The composite floor can be prefabricated in a factory, with light weight and no special fire and rust prevention treatment, which is in line with the development trend of assembly building. In order to investigate the flexural behavior of this kind of new composite slabs, the following specific research work has been carried out in this paper: 1. The flexural behavior tests of 11 full-scale square steel tube truss composite slabs are carried out. The slabs length is 3 m 4. 5m and 6 m respectively. The experimental results show that the bending process of composite slabs can be divided into three stages: the bottom concrete cracking, the tensile yield strength of the lower chord square steel pipe, and the buckling failure of the steel frame end web bar. The ultimate failure forms are too large buckling deformation of the web bar, resulting in the loss of the overall bearing capacity of the specimen. The stiffness and bearing capacity of the floor can meet the requirements of the normal service state and the limit state of the bearing capacity, and the peak bearing capacity is high and has sufficient safety reserve. The bending behavior of composite floor is simulated by finite element software ABAQUS. The simulated load-displacement curves agree well with the experimental results. Parameter analysis shows that the strengthened end web can effectively avoid the failure of the specimen caused by the buckling of the web bar found in the test and increase the bearing capacity of the floor at the same time. The analysis of the natural vibration frequency of the floor slab by linear perturbation shows that the natural vibration frequency of the floor slab is far greater than 5 Hz, which can meet the requirements of the code for comfort in normal use. Based on the experimental results of this paper, the calculation method of common reinforced concrete beams with double bars is modified and optimized, and the theoretical formulas for calculating the cracking moment and ultimate bearing capacity of composite slabs are presented. According to the structure of composite slabs, the formula of crack width and stiffness in GB50010-2010 (Code for Design of concrete structures) is modified, and the formula of maximum crack width and stiffness suitable for composite slabs is established. The error between the theoretical calculation values and the experimental results is small, which verifies the correctness and reliability of the crack moment formula and the ultimate bearing capacity formula proposed in this paper. Finally, based on the results of test and analysis, the design and construction suggestions for further optimization of floor slab are put forward.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
本文编号：2342020
[Abstract]:Although composite slabs of profiled steel and concrete and steel truss composite slabs have been widely used, but the work of wet work on the spot is too heavy to realize the construction assembly construction, at the same time, because of the high quality of floor, It is unfavorable to the earthquake resistance of structure and the reduction of foundation cost. Therefore, in recent years, the research on lightweight assembled composite slabs has attracted much attention. In this paper, a kind of square steel tube truss composite floor form is proposed, which is composed of thin-walled square steel tube chords and steel webs as the main force structure. The upper and lower surfaces are made up of concrete surfaces, and the inner space is filled with benzene panels with insulation and sound insulation. The composite floor can be prefabricated in a factory, with light weight and no special fire and rust prevention treatment, which is in line with the development trend of assembly building. In order to investigate the flexural behavior of this kind of new composite slabs, the following specific research work has been carried out in this paper: 1. The flexural behavior tests of 11 full-scale square steel tube truss composite slabs are carried out. The slabs length is 3 m 4. 5m and 6 m respectively. The experimental results show that the bending process of composite slabs can be divided into three stages: the bottom concrete cracking, the tensile yield strength of the lower chord square steel pipe, and the buckling failure of the steel frame end web bar. The ultimate failure forms are too large buckling deformation of the web bar, resulting in the loss of the overall bearing capacity of the specimen. The stiffness and bearing capacity of the floor can meet the requirements of the normal service state and the limit state of the bearing capacity, and the peak bearing capacity is high and has sufficient safety reserve. The bending behavior of composite floor is simulated by finite element software ABAQUS. The simulated load-displacement curves agree well with the experimental results. Parameter analysis shows that the strengthened end web can effectively avoid the failure of the specimen caused by the buckling of the web bar found in the test and increase the bearing capacity of the floor at the same time. The analysis of the natural vibration frequency of the floor slab by linear perturbation shows that the natural vibration frequency of the floor slab is far greater than 5 Hz, which can meet the requirements of the code for comfort in normal use. Based on the experimental results of this paper, the calculation method of common reinforced concrete beams with double bars is modified and optimized, and the theoretical formulas for calculating the cracking moment and ultimate bearing capacity of composite slabs are presented. According to the structure of composite slabs, the formula of crack width and stiffness in GB50010-2010 (Code for Design of concrete structures) is modified, and the formula of maximum crack width and stiffness suitable for composite slabs is established. The error between the theoretical calculation values and the experimental results is small, which verifies the correctness and reliability of the crack moment formula and the ultimate bearing capacity formula proposed in this paper. Finally, based on the results of test and analysis, the design and construction suggestions for further optimization of floor slab are put forward.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
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