【作者】 刘亚敏；

【导师】 吴方伯；

【作者基本信息】 湖南大学 ， 结构工程， 2007， 硕士

【摘要】 本文研究的装配整体式预应力空心楼板是结合应用了预应力技术和圆孔空心板的叠合结构。它是采用先张法工艺生产的预应力圆孔板作为底板,通过二次浇筑叠合层,构成装配整体式楼板结构体系。这种结构体系具有跨度大、自重轻、施工方便、适应性强等特点,是目前极具潜力的一种楼板形式。本文主要是对这种装配整体式预应力空心楼板在竖向荷载下的弹性阶段受力性能进行了试验和理论方面的研究。通过静水加载试验,本文对这种装配整体式预应力空心楼板弹性阶段的受力性能进行了研究。试验研究表明,试验楼板在加载过程中呈现了明显的双向受力特征;通过在预制板侧拼缝处纵向肋中配置纵向钢筋和折线形钢筋,板端支座处及垂直于预制板的长跨方向与梁连接处均按构造配有负钢筋,并在支座处两跨板之间的横向肋内配置横向钢筋,板端孔内加堵块与后浇灌缝混凝土形成一体。这使得楼板具有良好的整体性能,还具备承载力高和抗裂性能良好等特点。本文采用有限元分析程序ANSYS,对试验模型进行了分析,计算所得结构各点的荷载-位移曲线及结构内力分布,均与试验结果符合较好。在理论研究方面,本文按弹性理论对双向空心板两方向的刚度进行了分析。由于圆孔的存在,空心板在两个方向的刚度计算方法与实心板不同,计算结果表明,空心板在两个方向的刚度有所不同,且主要取决于孔径与板厚之比(d/h),但两者的差别不大。根据此结论将本文所研究的装配整体式空心楼板计算模型简化为普通现浇空心板模型。在此基础上,对计算模型运用拟板法的方法进行了弹性阶段内的内力分析。本文对不同类型空心板计算模型的内力进行了大量计算,分析了空心板在竖向荷载作用下的内力分布规律。更多还原

【Abstract】 The assembled monolithic prestressed hollow slab is a combined application of prestressed technology and hollow slabs technology. The assembled monolithic slab is composed of the prestressed hollow slab which is used as bottom plate and the secondary casting composite layer. This structural system with great potential in the future has the characters of large span, light weight, convenience of construction and good applicability.In this paper, the research is mainly focused on the mechanical characteristics of the assembled monolithic hollow slab under vertical loads in elastic stage.Through the experiment of the assembled monolithic prestressed hollow s under static water, its working performances of elastic stage are studied and analyzed. The experimental result indicates that the working character of the test slab is typically two-way obviously. The longitudinal reinforcement and fold-line reinforcement are disposed in the longitudinal rib of side slot of the prestressed slab, the detailing negative reinforcement is disposed in the bearing of slab end,the connection of beam and the length direction of prestressed slab, the transverse reinforcement is disposed in the transverse rib between two slab at the bearing. The hole of slab end is filled with the block and cast with post-casting concrete. Those makes the floor with good integral performance,high bearing capacity and good cracking resistance.Finite element analysis program ANSYS has been used to analyse the testing model. The calculated force-displacement curve and distribution of inner-force distribution are conformed to the result of experiment.In the aspect of theoretical analysis, stiffness of RC two-way hollow slab have been analyzed according to elastic theory. The result show that flexural stiffness of hollow slabs is different on two ways because of cavity, and the stiffness is mainly dependent on the ratio between hole aperture and plate thickness(d / h), but the difference between them if small. According to this conclusion, the assembled monolithic hollow slab that researched in this paper can simplify as common cast -in-place hollow slab model. Based on the simplification, the equivalent slab method can be used to analyse inner-force to the computation model under elastic stage. Through large calculation for inner-force of different hollow slab models, some rules of inner-force distribution of hollow slab under vertical loads can be obtained.更多还原