蜂窩梁應(yīng)力和撓度計算方法
李鵬飛, 姚謙峰
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(北京交通大學(xué)土木建筑工程學(xué)院,北京100044)[摘要]為了研究蜂窩梁應(yīng)力和撓度的計算方法,應(yīng)用有限元軟件ANSYS對蜂窩梁進行了整體和局部分析,得出蜂窩梁的受力特點。結(jié)合蜂窩梁應(yīng)力分布特點和自身結(jié)構(gòu)特征,以空腹桁架理論為基礎(chǔ),對蜂窩梁力學(xué)行為進行分析,推導(dǎo)均布荷載作用下蜂窩梁應(yīng)力的計算公式。根據(jù)蜂窩梁腹板開孔的結(jié)構(gòu)特點,以單位力法為基礎(chǔ),推導(dǎo)蜂窩梁撓度的計算公式。對不同蜂窩梁進行數(shù)值分析和理論計算,將應(yīng)力和撓度的公式計算結(jié)果與有限元分析結(jié)果進行對比,驗證了空腹桁架計算假定的正確性以及應(yīng)力和撓度計算公式的準確性。[關(guān)鍵詞]蜂窩梁;空腹桁架理論;有限元方法;應(yīng)力;撓度中圖分類號:TU391.2文獻標識碼:A文章編號:1002-848X(2011)02-0052-04Stress and deflection calculation methods of castellated beamsLi Pengfei, Yao Qianfeng(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)Abstract:In order to study the stress and deflection calculation methods, the stress characteristics of castellated beams were obtained through overall and local stability analysis by ANSYS. Based on the stress distribution and the structural characteristics of castellated beams, the practical formulas for stress calculation were deduced on the hypothesis of open-web truss theory. The deflection formulas were derived according to the web openings characteristics of castellated beams and the unit force method. By comparing the formula calculation results with finite element analysis results, the correctness of open-web truss theory hypothesis and precision of the formulas for stress and deflection were verified.Keywords:castellated beam; open-web truss theory; finite element method; stress; deflection作者簡介:李鵬飛,博士研究生,Email:lpf.china@163.com。參考文獻[1]李鵬飛.蜂窩梁的力學(xué)行為研究[D].石家莊:石家莊鐵道學(xué)院,2008.[2]羅列,羅曉霖.蜂窩梁設(shè)計規(guī)范的比較研究[J].建筑鋼結(jié)構(gòu)進展,2005,7(2):43-47.[3]MANDEL J A,BRENNAN P J. Stress distribution in castellated beams[J].Journal of the Structural Division,ASCE, 1971, 97(7): 1947-1967.[4]武岳,吳迪,林國鐸,等.六邊形孔蜂窩梁力學(xué)性能與計算方法[J].哈爾濱工業(yè)大學(xué)學(xué)報,2009,41(2):5-8.[5]白風(fēng)軍,馬克儉.蜂窩梁的靜力分析[J].貴州工業(yè)大學(xué)學(xué)報:自然科學(xué)版,2002,31(6):32-35.[6]包頭鋼鐵設(shè)計研究總院.鋼結(jié)構(gòu)設(shè)計與計算[M].北京:機械工業(yè)出版社,2006.[7]何一民,李鵬鴻,于力.蜂窩梁撓度的實用計算方法[J].工業(yè)建筑,1994,24(8):9-12.[8]王平.蜂窩梁撓度的簡化計算[J].四川建筑科學(xué)研究,2006,32(3):29-31.[9]周朝陽,劉純潔.蜂窩梁彎曲變形的實用計算方法[J].鐵道科學(xué)與工程學(xué)報,2007,4(1):72-76.