The Application And Reaserch Of The Horizantal Strenghthened Storey In SRC Frame-RC Tube

With the rapid development of tall buildings,frame-tube structures with a strengthened layer have been in more and more use in practical engineering. As is known to all, with the increment of building height, the Lateral displacement is proportional to the height with the fourth power. When the lateral displacement is too large, the traditional approach is usually to increase stiffness of resistance members such as shear wall and core-tube,but it not only increase the cost of building,but also affect the use of architectural features.For the commonly used structure style, such as the tube structure,tube in tube structure,only the inner cylinder bearing the overturning moment can not meet the requirements of the laterallimits.In recent years ,some experts have propose that the horizental strengthened storey structure should be adopted in strengthening the cooperative work between tube structure and the columns in the peripheral layer to control lateral distortion,namely,to put horizontal cantilever with hard quality between the tube and the frame,or set circumjacent zone with hard quality along with the peripheral frame. When come to the influence of earthquake, this desighs will cause the sudden change in the quality and internal force of the structure and thus forms a weak layer,which will make it difficult for the yield mechanism of the structure to carry out its extending bending system. In order to meet the"high-rise building of concrete structures technical regulations"after setting the strenghthened storey, the strenghthened storey'number,location and stiffness should be adjusted,the adverse effects on the structure should be analysised,especially weak layers under earthquake .Based on former researches and in combination with practical engineering,this thesis systematically studies the mechanical behaviors of steel reinforeed concrete truss frame.Tube structures with a strengthened story.The main works and achievements are as follows:1. It gives an introduction to the structure and the effect of a strengthened story ,it also present the advantages and application of steel reinforced concrete structures.Last it introduces existing researches and development on the structure of the frame-tube structures with a strengthened layer in tall buildings.2. Through analysis on mechanical behaviors concerning the horizontal strengthened story of a frame—tube structure,it is known that Setting the the horizontal strenghthened storey will cause major redistribution of internal forces,so Internal force will be more reasonable. It can fullly play the structure's resistance to lateral displacement potential.so it will effectively reduce the lateral displacement,and increase lateral stiffness.3.SATWE in PKPM is used to build a model of an office building in this paper,through changing strenghthened storey's location,number and stiffness,it is found that natural period of vibration,total lateral displacement,drift of storey and Mechanical behavior is different,so some useful conclusion is getted.4.Applying the dynamic response analysis and elastic Static,dynamic analysis to the SRC strenghthen layer ,it is known that dynamic response is different as the Setting program of the strenghthen layer is different.5.The SRC node, stress,strain and displacement are calculated with ANSYS.