上海信息枢纽大厦点支承玻璃幕墙的预应力张力桁架

CONSTRUCTION OF PRESTRESSED TRUSS SYSTEM FOR MULTI-SUPPORTS CURTAIN WALL OF SHANGHAI INFORMATION CENTER

上海信息枢纽大厦的点支承玻璃幕墙体系由预应力张力桁架等组成。计算采用有限元分析法 ,经过方案比较 ,施工时先预拼装水平桁架的内外弦杆 ,采用一端张拉的方式施加150kN预拉力后 ,再安装直腹杆和斜腹杆 ,采用该方案能在弦杆中建立均匀可靠的预拉力 ,并提高施工精度。

Multi-supports curtain wall of Shanghai Information Center is supported by prestressed truss system.Finite element method was adopted for design calculation.After schemes comparison,optimal construction method was selected.Inside and outside chords of level truss are firstly installed,followed by one end stretching with 150 kN prestress.Then vertical and tilt web members are installed.In this way uniform and reliable prestress can be achieved and precision of installation was improved.