The Stiffness Analysis On Bearing Of Two-way Great Cast-in-situ Concrete Hollow Slab That Formed By Edge Supporting

The Cast-in-situ reinforced and two-way structure of the hollow slab is a structural form that using of buried pipe core technology enables the formation of the internal cavity slab.It has features such as large span,lightness,convenient construction,currently,increasing applied the form of floor.At large inter-plate design,the existing methods in the design of reinforced concrete slab,they generally do not consider the stiffness of bearing components,the beam as a floor while supporting the fixed support to consider,when the beam size and a larger bending stiffness,the vertical deformation is far less than the floor,then ignore the vertical displacement of the floor beam deformation and impact force are acceptable,taking into account the larger the stiffness of hollow plate,while the relative stiffness of supporting beams of smaller features,then,the support beams became the practical problems of the disigners,finally.According to some experimental results and theoretical analysis of hollow cast-in-situ plate,this article does not take to reverse the side effect of supporting beam,hollow board for the equivalent solid orthotropic plate.Due to this paper studies pay more attentions of the bearing stiffness of the hollow board problem,so use line-plastic limit analysis approach to analysis different span of five different sizes of cast-in-situ hollow slab,the focus of analysis at the same loads of the two types of damage patterns,damage patterns of two ultimate load,through the model assumed that the damage occurred,the intensity of beams to draw,formula can be derived from the intensity of high beams in intensity to meet the circumstances,it can be in accordance with the principle of beam stiffness,in accordance with the deflection value of Code for design of Concrete Structures,reached the height of the direct beam.And simplify the analysis of both cast-in-situ hollow slab bending strength limit of the direction,give the calculation method.Finally,under the above theoretical analysis,the artivle practices a model experiment of the hollow slab,and analysis the deflection curves of edge beams of two-way great span hollow concrete floor under the different loads,provides a reference for engineering design,too.