- 摘 要
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周乾1,2，閆維明1（1 北京工業(yè)大學工程抗震與結構診治北京市重點實驗室，北京 100124；2 故宮博物院，北京 100009）
［摘要］采用力學分析方法，研究了古建筑木結構疊合梁與組合梁彎曲受力問題。以工程中常見的矩形木梁為例，討論了如下3個問題：1) 單梁開裂形成疊合梁后的彎曲受力性能；2) 疊合梁與組合梁彎曲受力性能的區(qū)別；3) 古建筑疊合梁“工字形”抗彎截面的合理性。結果表明：1) 單梁開裂后形成疊合梁，將導致截面彎應力峰值大幅度增加；2) 單梁加固采用組合梁做法比疊合梁做法更能節(jié)約材料且效果更好，且采用鋼材加固木梁比木材加固木梁所需截面尺寸?。?) 古建筑疊合梁“工字形”截面與相應等高度矩形截面相比，受彎承載力變化不大，具有合理性。
［關鍵詞］木結構；疊合梁；組合梁；應力分布；古建筑
中圖分類號：TU366-2文獻標識碼：A文章編號：1002-848X(2012)04-0157-05
Bending analysis on composite beam and combination beam of Chinese ancient wooden buildings
Zhou Qian1,2, Yan Weiming1（1 Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China; 2 Palace Museum, Beijing 100009, China）
Abstract:By mechanical analysis methods, internal forces of composite beam and combination beam of Chinese ancient wooden buildings under bending loads were studied. A typical rectangular beam was taken as an example to discuss the following problems: 1) variation of bending stress distribution of the beam after it cracked completely to form a composite beam; 2) when the beam was considered to be strengthened by composite beam or combination beam, the difference of bending performance between them; 3) rationality of “I-section” type of composite beam or combination beam of Chinese ancient buildings.Results show that:1) after a single beam cracks completely to form a composite beam, its peak bending stress value increases greatly,which may make itself destroyed; 2) when a single beam is strengthened by an additional beam, the combination beam is better than the composite beam, and steel is better than wood so far as strengthening material is concerned; 3) bending capability of “I-section” type of composite beam or combination beam of Chinese ancient buildings changes little compared to that of rectangular section type, which reflects its rationality.
Keywords:wooden structure; composite beam; combination beam; stress distribution; Chinese ancient building
*文化部科技創(chuàng)新項目（17-2009）。
作者簡介：周乾，博士研究生，高級工程師，Email：zy_7225@yahoo.com.cn。
參考文獻
［1］ GB 50005—2003 木結構設計規(guī)范［S］.北京:中國建筑工業(yè)出版社,2003
［2］ GB 50017—2003 鋼結構設計規(guī)范［S］.北京:中國計劃出版社,2003
［3］ （美）R C HIBBELER著.材料力學［M］.汪越勝，譯.北京：電子工業(yè)出版社，2006:252-257
