Critical issues of structural analysis for the Shanghai Center project

Shanghai Center,which has an architectural height of 632m,adopts the lateral resisting system of mega frame-core-outrigger structure,and is a steel-concrete hybrid structure.The tower architectural design,structural system,structural design principle and main results are introduced briefly.Some critical issues of structural analysis are present.The analysis results in reasonable design live load according to the code and architectural layout.The wind-induced structural response is studied,including comparison and discussion of wind tunnel results with ‘Load code for the design of building structures’(GB 50009—2001) calculations.From earthquake response studies,performance-based seismic design objectives and earthquake response spectrum are obtained,and structural degree of reliability is set.The bearing capacity and ductility of super columns are studies,and steel skeleton selection of the super column is discussed.Measures of structural steel usage optimization result in a reasonably economical steel usage of 12000t.Finally,elasto-plastic time history analysis shows that the structural seismic performance can satisfy the original targets with good ductility.