镇江体育会展馆张弦桁架优化设计分析
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摘要
镇江体育会展馆屋盖属于大跨度张弦桁架结构.首先以整体结构为研究对象,除对单榀张弦桁架进行设计外,着重对张弦桁架的侧向支撑进行了简化和优化设计.根据本工程的特点,沿整体桁架四周增加了对称拉索.然后对优化前后结构的力学性能进行了分析.分析结果表明:优化后结构更加简单,施工安装难度大大降低,结构应力峰值减小,结构挠度减少;优化后结构的基频增加,地震响应峰值减小,竖向刚度大大增加,结构抵抗地震能力增强.因此,张弦桁架结构优化分析应根据整体结构的特点,除进行单榀张弦桁架优化外还应重视其侧向支撑的设计优化.
The roof of Zhenjiang sports conference exhibition pavilion is a large span string truss structure.First,optimal designing of single string truss structure is done.Then lateral support is simplified and optimized and symmetrical cable is added.Mechanical character is compared between before and after optimal design.Compared with that before optimal design,the structure,the difficulty of construction,the maximum of axial stress,the maximum of axial stress and the middle vertical displacement after optimal design is simpler.The first natural frequency after optimal design is more greater and the vertical stiffness,the capacity of resistance earthquake after optimal design is greater.Therefore,optimization analysis of string truss sturcture should be based on the behavior of the overall structure.In addition to the single beam piece of string truss optimization,its lateral support design optimization should be paid attention to.
The roof of Zhenjiang sports conference exhibition pavilion is a large span string truss structure.First,optimal designing of single string truss structure is done.Then lateral support is simplified and optimized and symmetrical cable is added.Mechanical character is compared between before and after optimal design.Compared with that before optimal design,the structure,the difficulty of construction,the maximum of axial stress,the maximum of axial stress and the middle vertical displacement after optimal design is simpler.The first natural frequency after optimal design is more greater and the vertical stiffness,the capacity of resistance earthquake after optimal design is greater.Therefore,optimization analysis of string truss sturcture should be based on the behavior of the overall structure.In addition to the single beam piece of string truss optimization,its lateral support design optimization should be paid attention to.
引文
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[2]SAITOH Masao,OKADA Akire,MAEJIMA Katsuo,et al.Study on mechanical characteristics of a light-weight complex structure composed of membrane and abeam string structure[A].IASS Symposium on Spatial,Lattice,Tension Structures[C],1994:632-641.
[3]KATO S,NAKAZAWA S,MATUSUE Y,et al.Activecontrol of axial forces in beam string space frames[A].IASS Symposium on Spatial,Lattice,Tension Struc-tures[C],1994:664-673.
[4]陈以一,沈祖炎,赵宪忠,等.上海浦东国际机场候机楼R2钢屋架足尺实验研究[J].建筑结构学报,1999,20(2):9-17.CHEN Yi-yi,SHEN Zu-yan,ZHAO Xian-zhong,et al.Experimental study on a full-scale roof truss of ShanghaiPudong International Airport Terminal[J].Journal ofBuilding Structures,1999,20(2):9-17.
[5]陈荣毅,董石麟.广州国际会议中心展览大厅钢屋盖设计[J].空间结构,2002,8(3):29-34.CHEN Rong-yi,DONG Shi-lin.Design of exhibitionhall steel roof at Guangzhou International Convention&Exhibition Center[J].Spatial Structure,2002,8(3):29-34.
[6]乃国云.基于结构优化的张弦桁架经济性分析[M].北京:北京工业大学出版社,2008.
[7]R克拉夫,J彭津.结构动力学[M].北京:高等教育出版社,2007.
[8]R大崎顺彦,J田琪.地震动的谱分析入门[M].北京:地震出版社,2008.
[9]GB50011-2010.建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[10]邓军,唐家祥.时程分析法输入地震记录的选择与实例[J].工业建筑,2009,30(8):9-12.DENG Jun,TANG Jia-xiang.Choice and measurementof seismic records for time-history analysis[J].Indus-trial Construction,2009,30(8):9-12.
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