Study On The Punching Resisting Of Thin-wall Core Cast-in-site Reinforced Concrete Hollow Floor System

Thin-wall core box cast-in-site reinforce concrete hollow floor is a new type floor in which high strength thin-wall core boxes were laid as the certain rule. At the present time, few research on the punching capability of this system home and abroad has led to the status that we don't know what the force performance is and how to design it. So in this thesis, combining with the key item of construct science and technology of hunan province, by analyzing the force performance and the working mechanism of this structure subjected to vertical load and unbalanced bend, a formulas to calculate the punching of reinforced concrete hollow slab-column connections is put forward, and also the reference with proper theory foundations and calculation for this structure's design are provided. The mostly content is as follows:(1)Such plate was analyzed continuously in the stimulating sandwich plat method, according to the overseas tests'phenomena and results, a crack mode is supposed in the test, and a formulas is deduced to calculate the punching capacity of thin-wall core box cast-in-site reinforce concrete hollow slab, the calculation results agree well with the test results.(2)With the universal finite element software ANSYS, reasonable finite models for such slab-column connection were established and a static non-linear analysis was made, and the rule of this structure about the aspects of force deformation and destruction under vertical load and unbalanced bend are summarized. based on this, a simplified calculation method of punching capacity is advanced.(3)Using yielding line theory, we educed ultimate capacity of slab-column connection which was bend destroy under vertical load, vertical load and unbalanced bend in the text.(4) Two component anchor bolt and dowel are Afforded, a formulas to calculate the punching capacity of this slab-column connection with the effect of punching component is given in the article. Comparing with other kinds, the two punching component is effective.(5) The possible destroy patterns of this slab-column system are discussed in the text, and design principle and step in detail about slab-column connection are...