- 摘 要
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（1 重慶大學(xué)土木工程學(xué)院, 重慶 400045； 2 同濟大學(xué)土木工程防災(zāi)國家重點實驗室, 上海 200092）
［摘要］為了研究高溫下軸心受壓鋼構(gòu)件的局部穩(wěn)定設(shè)計方法，分析了現(xiàn)行《鋼結(jié)構(gòu)設(shè)計規(guī)范》（GB 50017—2003）中給出的寬厚比(高厚比)驗算方法，并對該方法中的彈性模量修正系數(shù)進行了改進。采用改進后的方法考慮了溫度對鋼材力學(xué)性能的影響，給出了高溫下軸心受壓鋼構(gòu)件寬厚比(高厚比)的驗算方法，利用有限元軟件ANSYS，結(jié)合試驗結(jié)果對給出的驗算方法進行了驗證。研究表明：對彈性模量修正系數(shù)進行改進后，計算結(jié)果更可靠；采用《建筑鋼結(jié)構(gòu)防火技術(shù)規(guī)范》(CECS 200:2006)中的鋼材高溫力學(xué)性能指標計算出的高溫下軸心受壓鋼結(jié)構(gòu)的寬厚比(高厚比)限值與常溫下的區(qū)別不大，該值可以采用一個與溫度有關(guān)的系數(shù)來確定。
［關(guān)鍵詞］局部穩(wěn)定; 寬厚比; 溫度; 軸心受壓; 鋼結(jié)構(gòu)
中圖分類號：TU392 文獻標識碼：A 文章編號：1002-848X(2014)09-0048-05
Local stability study of steel members under axial compression at room and elevated temperature
Wang Weiyong1, Li Guoqiang2, Huang Jie1
(1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract: In order to investigate the design approach of local stability of steel members under axial compression at elevated temperature, the check method proposed in current Design code for steel structures (GB 50017—2003) was analyzed and modification was made on the correction coefficient of elastic modulus. By adopting the modified method, influence of the high temperature on steel mechanical was presented and check method on width（height）-to-thickness ratio at high temperature was presented. FEM software ANSYS was used to verify the check methods in combination with experimental results. Results show that with improved correction coefficient of elastic modulus, the results are more reliable. The limit values of width(height)-to-thickness ratio for axial compressed steel members have little difference between room and elevated temperatures by employing the high temperature material mechanical properties presented in Code for fire safety of steel building structures (CECS 200:2006), and the limit value at elevated temperature can be determined by employing a coefficient related with temperature.
Keywords: local stability; width-to-thickness ratio; temperature; axial compression; steel structure
*中國博士后基金（20110490811，2012T50765），重慶市首批青年骨干教師資助計劃資助。
作者簡介：王衛(wèi)永，博士，副教授，Email：wywang@cqu.edu.cn。
參考文獻
［1］GB 50017—2003鋼結(jié)構(gòu)設(shè)計規(guī)范［S］.北京：中國計劃出版社，2003.
［2］CECS 200：2006建筑鋼結(jié)構(gòu)防火技術(shù)規(guī)范［S］. 北京：中國計劃出版社，2006.
［3］UY B, BRADFORD M A. Local buckling of cold formed steel in composite structural elements at elevated temperature［J］. Journal of Constructional Steel Research, 1995, 34(1):53-73.
［4］YANG K C, CHEN S J, LIN C C, et al. Experimental study on local buckling of fire-resisting steel columns under fire load［J］. Journal of Constructional Steel Research, 2005, 61(4): 553-565.
［5］KNOBLOCH M, FONTANA M. Strain-based approach to local buckling of steel sections subject to fire［J］. Journal of Constructional Steel Research,2006,62(1-2):44-67.
［6］HEIDARPOUR A, BRADFORD M A. Local buckling and slenderness limits for flange outstands at elevated temperatures［J］. Journal of Constructional Steel Research, 2007, 63(5):591-598.
［7］HEIDARPOUR A, BRADFORD M A. Local buckling and slenderness limits for steel webs under combined bending, compression and shear at elevated temperatures［J］. Thin Walled Structures, 2007, 46(2):128-146.
［8］陳驥. 受壓鋼構(gòu)件的板件寬（高）厚比［J］. 鋼結(jié)構(gòu)，1991，13（3）：53-59.
［9］何寶康. 軸心壓桿局部穩(wěn)定試驗研究［J］. 西安冶金建筑學(xué)院學(xué)報：自然科學(xué)版，1985（1）：20-34.
［10］TJ 17—74 鋼結(jié)構(gòu)設(shè)計規(guī)范［S］. 北京：中國建筑工業(yè)出版社，1975.
［11］RASMUSSEN K J R, HANCOCK G J. Plate slenderness limits for HSS sections［J］. Journal of Constructional Steel Research, 1992, 23(1):73-96.
［12］CHEN J, YOUNG B. Design of HSS columns at elevated temperatures［J］. Journal of Constructional Steel Research, 2008, 64(6): 689-703.
［13］SEIF M, SCHAFER B W. Local buckling of structural steel shapes［J］. Journal of Constructional Steel Research, 2010, 66(10):1232-1247.
