某采光顶及幕墙支承结构设计  

Supporting Structure Design of a Skylight and Curtain Wall

作　　者：朱礼敏[1] 赵爽[1] 汤荣伟[1] 宋涛[1] 

机构地区：[1]中国建筑科学研究院建筑结构研究所,北京100013

出　　处：《建筑科学》2012年第11期88-90,共3页Building Science

摘　　要：对某工程入口采光顶及幕墙支承结构的设计进行了深入探讨。由于建筑造型的要求,该采光顶张弦桁架与一般张弦桁架有很大区别,为了保证桁架的整体稳定,需要在上弦杆设置面外撑杆、竖腹杆与上弦杆刚接且要求竖腹杆截面的面外抗弯刚度大于面内刚度。此外,由于入口幕墙风荷载主要由采光顶边梁来承担,且该梁跨度达到36m,采用箱型宽扁梁截面可以满足其强度和变形要求。最后,由于下弦杆张拉力较大且竖腹杆与上弦杆刚接,必须设计合理的张拉施工方案,以保证结构安全。This paper studies the supporting structure design of an entrance skylight and curtain wall.For the architectural image requirement,the truss string structure in this skylight has great differences from the general one.In order to ensure the whole stability,it is needed that the out-of-plane braces are set for the top chord,the vertical web member should be rigidly jointed with the top chord and its out-of-plane flexural stiffness should be greater than the in-plane stiffness.In addition,because the wind load of the curtain wall is mainly undertaken by the boundary beam of the skylight and its span reaches 36m,the box wide-flat beam should be adopted to satisfy the strength and deformation requirement.At last,owing to the great tension force of the bottom chord and the rigid connection between the vertical web member and the top chord,the rational tension plan should be considered in order to ensure the structural safety.

关 键 词：张弦桁架 整体稳定 张拉方案 

分 类 号：TU391[建筑科学—结构工程] TU323.4