Based on the project of the Shenzhen Yi Zhan Tian Di Exhibition Center,three sets of large-span overhead corridors were introduced to build overall height and hollow indoor space,the structural scheme was adopted with 3～4 steel trusses serving as the main structure,positioned within the top two floors of the tower,the secondary structure consists of several floors of steel frames suspended below.A proposal was made to add prestressed steel cables throughout the height of the vertical web members of the steel trusses and the corresponding steel columns below,to achieve the goal of providing a secondary defense line for the suspension structure.The integration of steel structure and prestressing technology follows the design philosophy of'low investment,high return'effectively enhancing the load-bearing capacity of the structural system.Using SAP2000 software,several specialized analyses were conducted on the overhead corridors,including steel cable construction simulation,progressive collapse,the impact of different initial prestress values,dynamic time history during the dismantling process,the effect of horizontal forces on the internal forces of the steel cables,performance under rare seismic events,and comfort calculations.These studies reveal the force mechanism by which the addition of steel cables enhances both the deformation coordination ability and overall safety of the suspension structure.The elastic-plastic analysis of the entire structure under rare seismic events indicate that the steel components of the overhead corridors remained in an elastic state,with only significant damage observed in some wall limbs of the tower,measures such as increasing the reinforcement ratio of the wall limbs and hidden columns were implemented,effectively improving the overall seismic performance.
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