張弦桁架設(shè)計若干問題討論
余佳亮
- 摘 要
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(浙江大學(xué)建筑設(shè)計研究院, 杭州 310028)[摘要]對張弦桁架設(shè)計過程中的若干問題進(jìn)行了討論。增加張弦桁架的矢高或垂距可減小結(jié)構(gòu)跨中的撓度及彎矩,但增加矢高會加大結(jié)構(gòu)支座處的水平反力,加大風(fēng)荷載作用下結(jié)構(gòu)表面的風(fēng)載體型系數(shù),減小預(yù)拉力作用下結(jié)構(gòu)跨中的反拱值及反向彎矩,建議在設(shè)計時首先考慮使用增加垂距的方法來改善張弦桁架的受力性能。在反對稱荷載作用下,張弦桁架中的拉索及撐桿無法為桁架提供有效支承,對有可能遭遇反對稱荷載作用的張弦桁架應(yīng)重視結(jié)構(gòu)在該工況下的分析設(shè)計。張弦桁架傳力路徑較為單一,桿件的屈服有可能致使結(jié)構(gòu)實(shí)際的失穩(wěn)情形與彈性穩(wěn)定分析結(jié)果不符,對該類結(jié)構(gòu)進(jìn)行彈塑性穩(wěn)定分析是有必要的。將張弦桁架中的拉索設(shè)計成并行雙索的形式將有助于提高結(jié)構(gòu)的抗連續(xù)倒塌能力。[關(guān)鍵詞]張弦桁架; 受力性能; 結(jié)構(gòu)穩(wěn)定; 抗倒塌中圖分類號:TU393.3, TU311.4 文獻(xiàn)標(biāo)識碼:A 文章編號:1002-848X(2013)15-0068-05Discussion on issues of design of truss string structuresYu Jialiang(Architectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China)Abstract: Some issues on the design of truss string structure are discussed.The mid-span displacement and bending moment of structure can be reduced by raising the vector high and cable-vertical distance, but raising the vector high will increase the horizontal support reaction force and wind-load shape coefficient, and reduce the structural inverted arch value and inverted bending moment under pre-stressing force. Compared to raising the vector high, to raise the cable-vertical distance is a better way to improve the mechanical properties of truss string structure. Cable and brace of truss string structure are invalid under anti-symmetrical distributed load, so structural analysis and design under this type of load should be taken seriously. Force transfer path of truss string structure is single, member yield may cause structure actual failure mode is different from the results of elastic stability analysis, so elasto-plastic analysis is necessary for the structure. Double-parallel cable design method can enhance the capacity of progressive collapse resistance capacity of truss string structure.Keywords: truss string structure; mechanical properties; structural stability; progressive collapse resistance作者簡介:余佳亮,工學(xué)博士,一級注冊結(jié)構(gòu)工程師,Email: yujialiang33@126.com。參考文獻(xiàn)[1]董石麟,羅堯治,趙陽.新型空間結(jié)構(gòu)的分析、設(shè)計與施工[M].北京:人民交通出版社,2006.[2]JGJ 7—2010 空間網(wǎng)格結(jié)構(gòu)技術(shù)規(guī)程[S].北京:中國建筑工業(yè)出版社,2010.[3]龍馭球,包世華,匡文起,等.結(jié)構(gòu)力學(xué)教程(Ⅰ)[M].北京:高等教育出版社,2001:5.[4]余佳亮.無站臺柱張弦桁架雨棚結(jié)構(gòu)性能分析與倒塌模擬研究[D].杭州:浙江大學(xué),2012.[5]羅堯治,張彥,李娜,等.北京北站張弦桁架結(jié)構(gòu)工程[C]//第八屆全國現(xiàn)代結(jié)構(gòu)工程學(xué)術(shù)研討會論文集. 杭州:2008:426-429.[6]江曉峰.大跨桁梁結(jié)構(gòu)體系的連續(xù)性倒塌機(jī)理與抗倒塌設(shè)計研究[D].上海:同濟(jì)大學(xué),2008.[7]雷宏剛.鋼結(jié)構(gòu)事故分析與處理[M].北京:中國建筑工業(yè)出版社,2003.[8]CECS 212:2006 預(yù)應(yīng)力鋼結(jié)構(gòu)技術(shù)規(guī)程[S].北京:中國計劃出版社,2006.[9]JGJ 257—2012索結(jié)構(gòu)技術(shù)規(guī)程[S].北京:中國建筑工業(yè)出版社,2012.[10]陳志華,王小盾.日本索結(jié)構(gòu)設(shè)計規(guī)程和應(yīng)用[J].鋼結(jié)構(gòu),2004,19(4):70-73.
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