Large Column Net Cast Reinforced Concrete Hollow Large Precast Concrete Panel To Cover The Research And Application Of The Structure

With the national economy development, large span grid tall building develops rapidly in nationwide big & small cities, large span grid cast-in-situ reinforced concrete hollow big slab floor has been drawn attention by engineering circles, because it meet the comprehensive application requirement coming from modern living in large span grid, big width, flexible layout in room and also overcome the shortcoming of " emerging jointly both wall and beam" in usual frame-shearwall structure. The large grid cast-in-situ reinforced concrete hollow big slab floor that is "CA-CSP" technology, which is different from Hunan's "GBF" technology. Such structure in construction belongs to different behavior in two upright directions and it is also a kind of spatial structure of slab-column system with three dimensions in its mechanics' behavior. It is similar to I section beam along direction of layout pipe and to frame beam in upright direction, also there is different in two upright directions in section inertia pre meter. Hollow big slab is equivalent to two upright directions frame beams in accordance with the principle of same section inertia in two upright directions and process internal force calculation with existing analysis software. There are two calculation and analysis methods: one is accurate calculation and analysis method, that is rectangular grid slab method, another is applied calculation and analysis method, that is integrated stiffness method & incorporate method. We found that theory analysis matched well result of experiment through one to one model test and finite element nonlinear analysis. Such hollow big slab floor has the function of large span grid, large width, being optional division within room, which also has better mechanics' performance, economic index, easy method to calculate such . floor structure, reasonable calculation, large load-bearing of such floor, and has high safety affluence. Such floor has less thickness of slab, weight itself of slab decrease as a result decrease in quantity of reinforcement and reducing finally total engineering expense owing to apply light density embedded mortar pipe "CA-CSP". Hence, such floor has advantage of both reducing weight itself and overcoming the disadvantage of "emerging jointly both wall and beam", ensuring comprehensive function application, which also will be necessary for city construction and development.