（中国建筑西南设计研究院有限公司， 成都 610042）

［摘要］成都天府国际机场A区指廊屋盖平面尺寸约404m×112m，横断面呈双坡形，支承于两列外倾钢管混凝土斜柱上。屋盖采用四角锥焊接空心球网架结构，为增加中部天窗带的通透性，同时减小竖向荷载作用下斜柱柱底弯矩以利于基础设计，在屋盖跨中位置用钢拉杆局部替换下弦杆，并通过施加预应力减小对斜柱推力，形成局部张弦网架体系。进行了局部张弦网架的静动力分析、罕遇地震下的弹塑性时程分析、多点激励与一致激励的对比分析以及考虑局部断索的动力时程防连续倒塌分析；  结果表明，该指廊钢结构体系合理、抗震性能优良、防连续倒塌能力强，整体安全可靠。

［关键词］成都天府国际机场；  大跨度钢结构；  局部张弦网架；  节点分析；  防连续倒塌；  行波效应

中图分类号：TU318文献标识码：A文章编号：1002-848X(2020)19-0043-08

Steel structural design of airside concourses of Tianfu International Airport

XIE Junqiao, LIU Yifeng, XIA Xun, MA Yongxing, ZHOU Jinwei, WU Xiaobin, CHEN Zhiqiang, XIAO Kejian

(China Southwest Architectural Design and Research Institute Co., Ltd., Chengdu 610042, China)

Abstract:The plan size of the roof above the airside concourse of Chengdu Tianfu International Airport in A Area is 404m×112m. The roof with a double slope cross-section is supported on two rows of outwardly inclined concrete-filled steel tube (CFT) columns. In order to obtain better lighting in the middle skylight area and reduce the bending moment at the bottom of the inclined column under vertical load in favor of foundation design, the roof cover adopts a four corner cone welded hollow spherical net frame structure, replace the lower chord rod with steel tie rod in the middle of the roof cover span and reduce the thrust force on the inclined column by applying pre-stress to form a partially tensioned chord net frame system. Multiple numerical analyses were performed on the partial stringed system, including the static and dynamic analysis, elasto-plastic analysis under rare earthquakes, a comparative study on the multi-support excitation, and dynamic anti-progressive collapse simulation considering the rod failure. Results show that the roof system has excellent seismic performance and an anti-progressive collapse capacity. It is concluded that the design is reasonable and the structural system has enough safety margin.

Keywords:Chengdu Tianfu International Airport; large-span steel structure; partial stringed space grid; joint analysis; anti-progressive collapse; traveling wave effect

作者简介：谢俊乔，硕士，工程师，一级注册结构工程师，Email：xiejq568@126.com；  通信作者：刘宜丰，硕士，教授级高级工程师，Email：Lyf0142@163.com。