钢结构
鋼結構
강결구
Steel Construction
2015年
10期
9-17
,共9页
檩条%屈曲%临界荷载%势能
檁條%屈麯%臨界荷載%勢能
름조%굴곡%림계하재%세능
purlin%buckling%critical load%potential energy
采用开口薄壁构件理论，根据上翼缘侧移受约束的简支檩条在风吸力作用下发生弯扭屈曲的总势能，应用Ritz 法得到了无支撑冷弯 C 形和 Z 形檩条在线性弯矩下和两跨连续檩条均布荷载下的临界荷载计算式，并与采用了刚周边假定的 ANSYS 板壳元的分析结果进行了校正。最后与采用 ANSYS 板壳单元建模的、放弃了截面刚周边假定的分析结果进行对比，对临界荷载计算式进行修正，提出了与 ANSYS 分析结果符合很好的计算式。
採用開口薄壁構件理論，根據上翼緣側移受約束的簡支檁條在風吸力作用下髮生彎扭屈麯的總勢能，應用Ritz 法得到瞭無支撐冷彎 C 形和 Z 形檁條在線性彎矩下和兩跨連續檁條均佈荷載下的臨界荷載計算式，併與採用瞭剛週邊假定的 ANSYS 闆殼元的分析結果進行瞭校正。最後與採用 ANSYS 闆殼單元建模的、放棄瞭截麵剛週邊假定的分析結果進行對比，對臨界荷載計算式進行脩正，提齣瞭與 ANSYS 分析結果符閤很好的計算式。
채용개구박벽구건이론，근거상익연측이수약속적간지름조재풍흡력작용하발생만뉴굴곡적총세능，응용Ritz 법득도료무지탱랭만 C 형화 Z 형름조재선성만구하화량과련속름조균포하재하적림계하재계산식，병여채용료강주변가정적 ANSYS 판각원적분석결과진행료교정。최후여채용 ANSYS 판각단원건모적、방기료절면강주변가정적분석결과진행대비，대림계하재계산식진행수정，제출료여 ANSYS 분석결과부합흔호적계산식。
ABSTRACT:Based on the theory of thin-wall members with openings and the total potential energy of flexural-torsional buckling of simple purlins with restrained upper flanges under wind suction,the equations for the critical loads of the simply supported purlins under linear moment and two-span continuous purlins under uniform loads were obtained by Ritz method.The results were calibrated with analytical results that were obtained by shell elements with rigid profile assumption of ANSYS.Finally,the obtained equations were further improved by comparing with the results of ANSYS without the rigid profile assumption.The obtained formula for critical loads was amended and found to be in excellent agreement with the analytical results of ANSYS.
