合肥新桥机场大型箱形钢柱壁板稳定性研究  

Panel Local Stability of the Large Steel Box Column in Hefei Xinqiao Airport Building

作　　者：李德章[1] 李海锋[2] 

机构地区：[1]合肥市重点工程建设管理局,合肥230001 [2]同济大学建筑工程系,上海200092

出　　处：《结构工程师》2011年第1期47-54,共8页Structural Engineers

基　　金：大跨钢结构箱型钢柱壁板稳定和屋面抗风连接科研(20100527)

摘　　要：合肥新桥机场航站楼钢结构由多榀大跨度格构-实腹式转换刚架组成,转换部位及弧形实腹梁柱构件受力异常复杂,且实腹箱形构件体量大、板件宽厚比大,已接近或超过国家设计规范的限值。目前,对这类大跨度结构中大尺寸箱形构件的受力性能研究很少,根据设计需要,对合肥新桥机场航站楼钢结构中外形轮廓尺寸最大、壁板最薄的箱形钢柱进行壁板稳定性研究。采用数值分析方法,分别对轴力最大和轴力最小的两根箱形钢柱进行壁板稳定性态和极限承载能力分析,得到了腹板临界屈曲模态、极限状态下的鼓曲位移值及箱形钢柱弹塑性临界剪力,并与地震反复作用下,腹板平面外最大鼓曲位移及箱形钢柱剪力进行比较判断。研究表明,在地震反复作用下,轴力最小的箱形钢柱腹板均处于弹性工作状态;轴力最大的箱形钢柱,在小震作用下,腹板保持在弹性状态,在大震作用下,腹板进入弹塑性状态,但该柱仍具有承载能力,满足抗震安全需要。The steel terminal structure of Hefei Xinqiao Airport consists of dozens of large-span frames.The frames are composed of triangle trusses and box columns.The loading behavior of the transfer members between truss and column and the arc beams are very complex.The width-thickness ratios of box members approach or exceed the limit of design code.However,few studies have focused on the loading behavior of large box members in those large-span structures at present.According to design demands,the panel stability of steel box columns with the largest size and thinnest web in Hefei Xinqiao Airport was studied in this paper.Using numerical analysis method,analyses of panel stability and the load-bearing capacity of steel box column with maximum or minimum axial forces were conducted.Then the critical buckling modes of the web panel,buckling deformation in the ultimate state and the elasto-plastic critical shear forces of steel box columns were obtained,which were compared with maximum out-plane deformation of web panel and shear forces of steel box column under seismic load.The results indicate that the web panel of box column with minimum axial force is in the elastic state under seismic load.Under frequent seismic load,the web panel of box column with maximum axial force is in the elastic state,while the web panel is in the elasto-plastic state under rare seismic load.And the box column still has the carrying capacity under rare seismic load,which can satisfy the aseismic requirement.

关 键 词：箱型钢柱 壁板稳定性 弹塑性屈曲分析 合肥新桥机场 

分 类 号：TU391[建筑科学—结构工程]