| Steel reinforced concrete frame column and concrete-filled circular steel tube frame column are the most two common composite structural columns,which are also the two most frequently used columns in super high-rise buildings.They both have outstanding performance in bearing capacity,stiffness,seismic and dynamic performance.Compared to the reinforced concrete column,the composite column can reduce the dimension of cross section,structural weight,and earthquake effect,with enhancing effective space,lowering cost,facilitating installation,shortening construction period,and improving ductility of components and structure.Compared to steel columns,they can help decrease the steel consumption,and improve the stiffness,stability,performance of fire-resistance and durability as well.Since these two composite structures are widely used in super high-rise buildings,it is very necessary to conduct comparative study between them in terms of mechanical performance,seismic properties,and economy,etc.After many years of worldwide research and practical application of these two composite columns,the design method has become very comprehensive so far.This paper starts with the component design comparison between the steel reinforced concrete frame column and concrete-filled circular steel tube frame column,including the following four aspects:column design,joint design,design requirements of codes,and the future direction of research.In this paper,performance design of steel reinforced concrete frame column and concrete-filled circular steel tube frame column are applied to a super high-rise building respectively.Also the design results are fully compared,including the elasticstructural serviceability under wind load stage,elastic performance under minor,moderate,and major earthquake,and the elasto-plastic performance under severe earthquakes.Response spectrum method and time history method are adopted in elastic seismic design;while time history method with explicit integral is adopted in elasto-plastic seismic design,in which geometric nonlinearity,material nonlinearity,and nonlinearity of construction process are considered.The comparison result shows that the stiffness of steel reinforced concrete frame column is slightly higher than that of concrete-filled circular steel tube frame column;on the other hand,ductility of the latter is slightly better than the former.Based on design result of this building using two composite columns respectively,the comparison is made in terms of material consumption,convenience of construction,fireproof performance,cost of renovation and maintenance.It is shown the concrete consumed in the model using steel reinforced concrete frame columns is 35.1%more(2348.059 m~3)than that using concrete-filled circular steel tube frame columns;and the steel(including steel rebar and steel structure)consumed in the model using steel reinforced concrete frame columns is 14.5%more(691.157t)than that using concrete-filled circular steel tube frame columns.It is revealed that steel reinforced concrete frame column is more economical than concrete-filled circular steel tube frame column for the building in this paper.In the end,suggestions on the section selection of frame columns are provided for the similar super high-rise buildings. |
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