884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 同濟大學建筑工程系，上海 200092；2 博思格藍璀建筑鋼結(jié)構(gòu)（上海）有限公司，上海 201613）

［摘要］由兩個槽形截面構(gòu)成的抱合箱形截面在超薄壁冷彎型鋼結(jié)構(gòu)中應(yīng)用廣泛，但關(guān)于其承載力的計算只是將單個構(gòu)件的承載力簡單地數(shù)學疊加，并沒有相應(yīng)公式來考慮單個槽形截面構(gòu)件之間的相互加強。對40根高強冷彎薄壁型鋼抱合箱形截面受壓構(gòu)件進行試驗研究，考察其受力特性及破壞特征，包括軸壓構(gòu)件21個，繞弱軸偏心和繞強軸偏心構(gòu)件共19個。試驗研究結(jié)果表明：抱合箱形截面構(gòu)件由于兩個槽形截面試件的相互約束作用，實測承載力比按單根構(gòu)件計算承載力疊加結(jié)果提高10%~20%左右。最后，在試驗和理論分析的基礎(chǔ)上，針對高強冷彎薄壁型鋼抱合箱形截面受壓構(gòu)件極限承載力提出了一種建議計算方法，依照建議計算方法所得結(jié)果與試驗結(jié)果吻合較好，且偏于安全，可供實際設(shè)計參考。

［關(guān)鍵詞］超薄壁冷彎型鋼；抱合箱形截面；軸壓構(gòu)件；偏心受壓構(gòu)件；極限承載力

中圖分類號：TU392.1，TU317.1文獻標識碼：A文章編號：1002-848X(2011)06-0036-06

Load-carrying capacity of 550MPa high-strength cold-formed thin-walled steel built-up box section columns

Li Yuanqi¹, Yao Xingyou¹, Shen Zuyan¹, Wang Shukun², Liu Xiang¹(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 BlueScope Steel （Shanghai） Co.， Ltd., Shanghai 201613, China）

Abstract:Built-up box section columns by two lipped channel sections are widely used in super thin-walled cold-formed steel structures. However, for their load-carrying capacities of built-up box section columns, usually a mathematical sum according to the load-carrying capacities of each channel section involved is utilized without any further consideration on the reinforcement between single channel sections. Load-carrying capacities and failure modes of 40 high-strength cold-formed thin-walled steel built-up box section columns have been studied, including 21 axially-compressed columns and 19 eccentrically-compressed columns subjected to bending moments along the weak axis and the strong axis respectively. The results show that, due to the interaction between two lipped channel columns connected by self-drilling screws, the ultimate load-carrying capacity of a built-up box section column is 10% to 20% higher than the sum of the ultimate load-carrying capacity of two single lipped channels loaded in the same way independently. Based on the tests and theoretical analysis, a proposed method to estimate the ultimate load-carrying capacity of built-up box section columns reasonably was presented. It can give a close and conservative estimation results, and be referred in practical design.

Keywords:super thin-walled cold-formed steel; built-up box section; axially-compressed columns; eccentrically-compressed columns; ultimate load-carrying capacity

*國家科技支撐計劃項目（2006BAJ04A02\|04）。

作者簡介：李元齊，博士，教授，Email：liyq@#edu.cn。

參考文獻

［1］  GB50018—2002 冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范［S］．北京：中國計劃出版社，2002.

［2］  RHODES J, HARVEY J M. Interaction behavior of plain channel columns under concentric or eccentric loading［C］// Proc. 2nd Int. Colloquium on the Stability of Steel Structures, ECCS, Liege, Belgium, 1977:439-444.

［3］  THOMASSON P O. Thin-walled C-shaped panels in axial compression ［J］. Journal of Structural Engineering, 1978, 116(5):1230-1246.

［4］  MULLIGAN G P, PEKZ T. Locally buckled thin-walled columns ［J］. Journal of Structural Engineering, 1984, 110(11):2635-2654.

［5］  LAU S C W, HANCOCK G J. Strength tests and design methods for cold-formed channel columns undergoing distortional buckling［R］.  School of Civil and Mining Engineering, Univ. of Sydney, Australia,1988.

［6］  WENG C C, PEKZ T.Compression tests of cold-formed steel columns ［J］. Journal of Structural Engineering, 1990, 116(5):1230-1246.

［7］  KWON Y B, HANCOCK G J.Tests of cold-formed channels with local and distortional buckling ［J］. Journal of Structural Engineering, 1992, 118(7):1786-1803.［8］  YOUNG B, RASMUSSEN K J R. Design of lipped channel columns ［J］. Journal of Structural Engineering, 1998, 124(2):140-148.

［9］  YOUNG B. Experimental investigation of cold-formed steel lipped angle concentrically loaded compression members ［J］. Journal of Structural Engineering, 2005, 131(9):1390\|1396.

［10］  沈祖炎, 李元齊. 高強冷彎薄壁型鋼C形截面軸壓構(gòu)件承載力試驗研究，高強冷彎薄壁型鋼成套技術(shù)研究報告No1［R］. 上海: 同濟大學、博思格建筑系統(tǒng)住宅部,2007.

［11］  沈祖炎, 李元齊. 高強冷彎薄壁型鋼C形截面偏壓構(gòu)件承載力試驗研究，高強冷彎薄壁型鋼成套技術(shù)研究報告No3［R］.上海: 同濟大學、博思格建筑系統(tǒng)住宅部,2007.

［12］  DEWOLF J T, PEKZ T, WINTER G. Local and overall buckling of cold-formed members ［J］. Journal of Structural Engineering, 1974,100(10):2017\|2036.

［13］  BEN YOUNG, M ASCE, JU CHEN. Design of cold-formed steel built-up closed sections with intermediate stiffeners ［J］.Journal of Structural Engineering, 2008, 134(5):727-737.

［14］  GB/T228—2002 金屬材料\|室溫拉伸試驗方法［S］.

［15］  李元齊，王樹坤，沈祖炎.高強冷彎薄壁型鋼槽形截面軸壓構(gòu)件承載力計算模式研究［J］.建筑結(jié)構(gòu)學報，2010，31（11）：17-25.