The Theoretic Study On Thin-wall Core Cast-in-site Reinforced Concrete Hollow Floor Structure

Thin-wall core box cast-in-site reinforce concrete hollow floor is a new type floor in which high strength thin-wall core boxes were laid as the certain rule. The floor has a lot of advantages such as wide-practicability, excellent usage performance, low integrative cost. It adapts to the large column span and bay width floor structure. However, the lack of research on this special structure home and abroad has led to the station that we don't know what the force performance is and how to design it. So in this thesis, combining with the item "The Theoretic and Technical Study on Thin-wall Core Cast-in-site Reinforced Concrete Hollow Floor ", the topic for discussion will be emphasized particularly on the investigation for the force performance and the working mechanism of this structure subjected to vertical load. At the same time it provides engineering application with practical and concise computational method, and also provides the advice for this structure with proper theory foundations and schemes to some extent. The full article is divided into five chapters, as follows:In the first chapter, we studied the construction of such plate and put forward the advices of design construction of the floor combining with the current concrete criterion.In the second chapter, such plate was analyzed continuously in the stimulating sandwich plate method that considers the transverse shear deformation. At the same time we provided the double trigonometric progressional solution at the common boundary condition. And combining with the taken test of such plate abroad this analysis method was proved to be accurate and credible.In the third chapter, reasonable finite element models for such structure were established and a static non-linear analysis was made, and we summarized the rule of this structure about the aspects of force, deformation and destruction. Discussed the punching shear method briefly and the modification according to the punching shear formula is given combining with the abroad test and the current criterion.In the fourth chapter, such structure's dynamic characteristic was analyzed briefly. And we conclude the inherent frequence formula of this structure by the energy method. It will be very convenient for future practical design.In the fifth chapter, the floor was simplified as the system of spaced beams by means of the principle of equal-stiffness, and the practical calculation method of suchplate are presented, and through a practice, the process of calculation is introduced. Compared with the same column span size of the common solid slab floor, the applicability in engineering is proved and it is good for being popularized.