Analysis of lateral stiffness and sidesway buckling of a 388m super high-rise building
Using the structural design of a super high-rise building with a side core-perimeter moment frame lateral force-resisting system stiffened by outriggers and belt trusses as a real project example,the methods for performing lateral stiffness and sidesway buckling analyses of high-rise buildings were discussed.It is pointed out that when calculating the lateral stiffness of the structure,in-plane flexibility of floor diaphragms,flexibility of structural elements in the basement,the cracked stiffness of reinforced concrete members in the lateral force-resisting system and second-order effects should be considered such that realistic values of storey drifts and sidesway buckling load factors can be best estimated.An iterative procedure for evaluating the cracked stiffness of reinforced concrete members in the lateral force-resisting system using the moment-curvature analysis method and member force demands induced by the applied lateral forces was recommended.The calculation methods of sidesway buckling analysis in standards of China,European Union and the United States were compared.It is also pointed out that when performing the sidesway buckling analysis,the unfavourable factors on the lateral stiffness listed above should also be considered in order to realistically quantify second-order effects.The appropriate limits on storey drifts for serviceability were further discussed,and the recommended calculation methods and limit values of inter-storey drift ratio in the United States standards were introduced.Shortcomings of performing lateral stiffness analyses in the current Chinese standards were highlighted,to serve as a valuable reference for similar engineering design.
super high-rise buildinglateral stiffnesslimit value of inter-storey drift ratiocracked stiffnessmoment-curvature analysis methodsidesway buckling analysis
NETL
NSTL
万方数据
维普
