Study On The Analysis And Design Method Of Cast-in-site Hollow Concrete Floor System

Cast-in-site Hollow Concrete Floor System is one of the new types of floor system occurred in China. This kind floor system have many advantages such as stinting material, lightening deadweight, larger span, better effect in insulation of thermal and sound, and can knock down the synthetic cost. It has been listed in Major Promotional Projects by Ministry of Construction ER.China. Though "Technical specification for cast-in-situ concrete hollow floor structure" has been published in 2004, there are many problems in the use of designing.This thesis mainly studies on the cast-in-site hollow concrete column-supported slab which embeds with tube filler. After analyzing and summarizing the researching works of earlier scholar, the thesis accomplished the main subjects as follow.1. By means of the finite element software ANSYS, this paper analyzes the elastic flexural stiffness difference due to collocation direction of the tube filler. Bases on the experimentation data offered by China Academy of Building Research, this paper analyzes the influences of the collocation direction of the tube filler on the flexural capacity and the stiffness after cracking of the slab.2. Under the action of vertical load, this paper discusses on the analysis methods of the Cast-in-site Hollow Concrete Floor System, and study on how to analyze the floor system with the software PKPM.3. Under the action of horizontal load, "Technical specification for cast-in-situ concrete hollow floor structure" introduced Equivalent Frame Method. The stiffness coefficient for the equivalent beam is the sticking point of EFM. Using the finite element software ANSYS, this paper analyzes the influences of the collocation direction of the tube filler on the model of the equivalent frame, the relation between the stiffness coefficient and the main parameter. Through the analysis on the main parameter, the formula on stiffness coefficient for the equivalent frame beam is given out.4. The flexural, shear and punching shear capacity of Cast-in-site Hollow Concrete Floor System is discussed. A suggestion how to calculate the punching shear capacity of the boundary of hollow and solid slab is put forward.5. The essential details design of the Cast-in-site Hollow Concrete Floor System is summarized.