The Study And Analysis Of The Cast-in-place Concrete Hollow Floor Slab

Today, in the industry and civil buildings, reinforced concrete constructions is the most popular construction form by its' popular original material, mature technology, low cost. With the improvement of our living condition and domestic economic strength, modern building is stricted to floor height, flexible assignment and big span, big space, all of those make architectural designer research new, comfortable, economical reinforced concrete constructions type.At present, the floor board usually uses beam board and non beam board, because the beam board cann't satisfied the clear height and the rooms' pleasing to the eye, and because the non-beam boards' heavy weight, its' apting to produce cracks and big deflection, it cann't be used in big span, big space buildings. It is necessary for engineers to research a new construction style for the peoples' command. In recent years, people developed the cast-in-place reinforced concrete hollow floor, which can resolve the raised problems preferably. The cast-in-place reinforced concrete hollow floor technology is a new idea in our nation's architecture region. It has many special characteristics. Such as strong rigidity, high intensity, light weight, simple architectural design, flexible function, convenient working. It possesses superior social economy value, huge market potentiality, wide-ranging developing future.There isn't a design norm for the cast-in-place reinforced concrete hollow floor presently, This article starts with the calculation of the cast-in-place reinforced concrete hollow floor, and utilizes the finite element authorware ANSYS to found a series of numerical value analysis models of cast-in-place reinforced concrete hollow floors with difference ratios of length to width, different hollow ratios, and different layouts of the hollow tubes. The conclusions of the FEM analysis showed that the board under the vertical load functions displays bi-direction nature of bend, its stress characteristic is similar with solid board. With the same hollow ratios, the deflection and stress of the cast-in-place reinforced concrete hollow floor is smaller, when the hollow tube section is circle, however, it's bigger when the tube section is trapezoid. And it can take full advantage of material efficiency, if the thin tube is disposed among the floor along thickness direction. In hollow floor design, the board stress is more advantageous, when the clear distance of hollow tube and the thickness of fluctuant concrete are not less than 50mm, while the hollow ratio remains in 35% ～ 45%. A reasonable design method is put forward according to the bearing characteristic of hollow floor, that the computational method of hollow floor make equivalent for the solid board, and the corresponding suitable condition is also pointed out. Compared with the finite element method, the calculation accuracy is higher...