Static&Dynamic Analysis And Construction Technology Of Thin-wall Core Box Cast-in-situ Concrete Hollow Floor

Thin-wall core box cast-in-site concrete hollow floor is a new type of flat slab floor system, in which a certain number of permanent thin-wall core boxes were embedded in flat slab floor; it has many advantages such as lightening self-weight, relative lower height, relieving earthquake effect, heat preservation and insulation, sound insulation, etc. It was especial suitable for these construction with large column grid and width room. Under the promotion of government in recent years, it has been very good in many engineering applications. But the present domestic and foreign research work mainly focus on the cylinder hollow floor, this structure of research work is relatively lack, its mechanical performance, designing theory remains to be further research work. Combined with the research status of this structure, the main content of this paper is as follows:1. This thesis briefly introduces thin-wall core box cast-in-site concrete hollow floor, and compared with the other floor, analysis the characteristics of hollow, and summarizes the research status of hollow floor at home and aboard.2. Through the calculation of stress and deflection of hollow floor, the main parameters were studied including section width of the rid, the height of the rid, the rid spacing in the slab, top and bottom panel thickness to find out the change rule of the stress and the deflection of hollow floor. The results show that the height of the rib and the rib spacing in the slab hare bigger influence on the stress and deformation of hollow floor, and suggest the value range of each parameter.3. We built general floor model and hollow floor model to study these two kinds of models’period, vibration mode characteristics earthquake shear force, structure displacement between the layers and the stress of beam, slab, and column under normal earthquake. The consequence suggested hollow floor model has smaller overall stiffness and larger natural vibration period compared to general floor; under the same earthquake, the deformation of the hollow floor is larger. On the basis of response spectrum analysis; we chose three kinds of real seismic waves to conduct time history analysis of two models, in order to checking the bottom of the shear, between the layers of the shear and the displacement.4. Combined with practical engineering project, we studied the construction process, construction points and matters needing attention of the cast-in-situ concrete hollow floor.