天津文化中心大剧院抗扭桁架蒙皮效应分析

Analysis on stressed skin diaphragm on torsion truss of Tianjin Grand Theater in Tianjin Cultural Center

天津文化中心大剧院屋盖由于建筑方面的要求,部分悬挑桁架仅与巨型桁架连接,缺少向内延伸的桁架,使得巨型桁架承受巨大的扭矩,针对这种情况,设计采用目前国内甚少的覆盖波纹钢板的巨型桁架,利用钢板的蒙皮效应来抗扭。简述了蒙皮效应的基本概念,论述了钢板加强桁架的蒙皮方法的设计概念,提出了分析方法,进而针对无板桁架、平板桁架和波纹板桁架3种桁架的受力性能进行了对比分析,得到了桁架位移、桁架梁单元应力和杆单元应力的不同结果。明确了覆盖钢板的桁架能较好地改善结构的性能,提高承载能力。发现平板桁架杆件应力要小于波纹板桁架的杆件应力,但波纹板变形均匀,能够较好地避免钢板局部变形现象的出现。

Because of the architectural requirement,some cantilever trusses of Tianjin Grand Theater are just connected with huge trusses without the extension trusses.Consequently,the huge trusses should be designed to bear the torque.Huge truss covered with corrugated plates which is seldom applied before is designed.The stressed skin diaphragm was utilized to bear the torque.The basic concept of stressed skin diaphragm was stated and the method of stressed skin diaphragm on torsion truss was put forward.By the comparison among truss without steel plates,truss with flat steel plates and the truss with corrugated steel plates,the displacement and internal force of the structure were analyzed.The behavior of the structure can be improved when the thin steel plates covered the truss.Even though the internal force of truss with flat steel plates is lower than that with corrugated steel plates,the corrugated steel plates with homogeneous deformation can avoid the local deformation.