Structural design of an out-of-code high-rise oblique grid tube-in-tube structure
The structural height of an oblique grid tube-in-tube out-of-code high-rise project is 158m.The tube-in-tube structural system composed of reinforced concrete core tube and steel oblique grid outer tube is adopted.The outer tube is composed of steel inclined columns and horizontal ring beams.There are irregular situations such as large openings on the floor,sudden change of vertical stiffness,inclined columns and through-layer columns.The two structural forms of reinforced concrete inner tube and steel frame-braced inner tube were compared and analyzed.The steel inclined column of outer tube was compared and analyzed by box section and circular section respectively.The results show that the construction operation of the box section steel oblique grid outer tube-reinforced concrete inner tube structure system is simpler and more economical,which can better meet the requirements of the building.The out-of-code situation and measures of the structure,the finite element analysis of the key nodes of the oblique grid,and the dynamic elastic-plastic analysis of the rare earthquake were mainly introduced.It is verified that the tube-in-tube structure system composed of reinforced concrete core tube and steel oblique grid outer tube has good seismic performance.
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