... steel structure" (JGJ81-2002, J218-2002)"Technical Specification for Steel Structures of Tall Buildings" (JGJ99-9)Commonly used steel ... Service, Steel Building,Space Frames, Portable Cabins, Tubular Steel Structures,basic building elements(built-up welded H-section , hot ... Engineering Design Software:AutoCAD,PKPM,MTS,3D3S, Tarch, Tekla Structures(Xsteel)V12.0.etc* Certificate: ISO9001:2000 ; ISO14001:2004 ...