Deformation Analysis And Calculation Of Reinforced Concrete Waffle

As an important force-resistance structure, the capacity of the reinforced concrete waffle slab is better than one-way slab and two-way slab: not only on the capacity of force-resistance and economic, but also on the capacity of externality. Considering the materials of concrete and the steel bar are nonlinear and the transforms shape is nonlinear, which make it more complicate to calculation the waffle structure .At present, the elastic flexure theory was usually adopted when calculated the deflection of reinforced concrete waffle slab, with the nonlinear property almost ignoring, these result in the huge difference between calculation results and physical circumstances.The formula of deflection of the reinforced concrete waffle is deduced in this thesis as the main job. In order to simplify the calculation, I did such suppose as follows: Change the T shape waffle slab form into rectangle shape of waffle slab; with the help of principle of virtual work, the expression of the displacement function is obtained. Then, on the basis of the nonlinear character of concrete and steel bar, making use of M ?φfolded-line, the rigidity of rectangle-crossed beam is deduced, and the expression of the rigidity of beam which is subjected different loads is got; secondly, through the displacement function, the relations between beams in waffle is obtained, so the rigidity of each beam in frame structure is obtained (the rigidity of beam is based on the principle of lowest rigidity). The parameters such as concrete strength,reinforced ratio,the space between waffles and so on that affect the deflection are analyzed. Compared with the experiment data, the formula result is matched to the experiment data.