初始缺陷对三向张弦梁结构整体稳定性影响研究
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摘要
三向张弦梁结构是新广州站工程采用的一种新型张弦梁结构,因此有必要对三向张弦梁结构的整体稳定性能进行深入的研究。该文首先对随机缺陷模态法进行了改进,使其更适用于网壳与张弦梁混合结构的缺陷稳定性分析。然后分别采用改进的随机缺陷模态法和一致缺陷模态法对三向张弦梁结构的缺陷稳定性进行了研究。分析结果表明:改进后的随机缺陷模态法更适用于网壳和拱梁混合结构形式的缺陷稳定性分析;缺陷越大,该三向张弦梁结构对缺陷越敏感,整体稳定性能受缺陷的影响越大;与理想结构破坏模式最接近的特征值屈曲模态为最不利的特征值屈曲模态,按此模态施加初始缺陷后的结构承载力最低;按非线性屈曲模态对结构施加缺陷得到的结构极限承载力小于按特征值屈曲模态施加缺陷的情况,与随机缺陷模态法的结果最为接近。
Tri-directional beam string structure(TBSS) is a new type of beam string structure which is used in the new Guangzhou railway station.It is necessary to conduct stability analysis of this structure.Firstly the stochastic imperfection method was improved to make it more applicable to the structures mixed with grid shells and BSS.Then the imperfect stability of TBSS was studied with the improved stochastic imperfection method and the consistent imperfection method.The results show that improved stochastic imperfection method is suitable for the imperfect stability analysis of the structures mixed with grid shells and beam string structure.As the degree of imperfections becomes larger,the structure is more sensitive to the imperfections and the influence of the imperfections on its stability behavior becomes more obvious.The eigenvalue buckling mode which is the closest to the collapse mode of the structure is the most disadvantageous eigenvalue buckling mode,and the stability capacity of the structure with imperfections base on this eigenvalue buckling mode is the lowest.However,the stability capacity of the structure with imperfections based on the nonlinear buckling mode is lower than that based on eigenvalue buckling mode,and it is very close to the results given by the improved stochastic imperfection method.
Tri-directional beam string structure(TBSS) is a new type of beam string structure which is used in the new Guangzhou railway station.It is necessary to conduct stability analysis of this structure.Firstly the stochastic imperfection method was improved to make it more applicable to the structures mixed with grid shells and BSS.Then the imperfect stability of TBSS was studied with the improved stochastic imperfection method and the consistent imperfection method.The results show that improved stochastic imperfection method is suitable for the imperfect stability analysis of the structures mixed with grid shells and beam string structure.As the degree of imperfections becomes larger,the structure is more sensitive to the imperfections and the influence of the imperfections on its stability behavior becomes more obvious.The eigenvalue buckling mode which is the closest to the collapse mode of the structure is the most disadvantageous eigenvalue buckling mode,and the stability capacity of the structure with imperfections base on this eigenvalue buckling mode is the lowest.However,the stability capacity of the structure with imperfections based on the nonlinear buckling mode is lower than that based on eigenvalue buckling mode,and it is very close to the results given by the improved stochastic imperfection method.
引文
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[2]陈以一,沈祖炎,赵宪忠,等.上海浦东国际机场候机楼R2钢屋架足尺试验研究[J].建筑结构学报,1999,20(2):9―17.Chen Yiyi,Shen Zuyan,Zhao Xianzhong,et al.Experiment study on a full-scale roof truss of ShanghaiPudong international airport terminal[J].Journal ofBuilding Structures,1999,20(2):9―17.(in Chinese)
[3]孙文波,杨叔庸,陈荣毅.广州国际会展中心张弦桁架竖向刚度性能[J].华南理工大学学报(自然科学版),2003,31(11):33―36.Sun Wenbo,Yang Shuyong,Chen Rongyi.Stiffnessperformance of truss-string structure of Guangzhouinternational convention and exhibition center[J].Journal of South China University of Technolog(NaturalScience Edition),2003,31(11):33―36.(in Chinese)
[4]李维滨,施骏,郭正兴.大跨度张弦桁架预应力张拉控制研究[J].东南大学学报(自然科学版),2003,33(5):593―596.Li Weibin,Shi Jun,Guo Zhengxing.Research onprestress stretching control of a large-span truss stringstructure[J].Journal of Southeast University(NaturalScience Edition),2003,33(5):593―596.(in Chinese)
[5]Kato S,Nakazawa S,Matsue Y,et al.Active control ofaxial forces in beam string space frames[C]//Abel J F.IASS Symposium on Spatial Lattice and TensionStructures,Atlanta,GA,USA,1994:664―673.
[6]Saitoh M,Okasa A.The role of string in hybrid stringstructure[J].Engineering Structures,1999,21(8):756―769.
[7]杨睿,董石麟,倪英戈.预应力张弦梁结构的形态分析——改进的逆迭代法[J].空间结构,2002,8(4):29―35.Yang Rui,Dong Shilin,Ni Yingge.Form findinganalysis of prestressed beam string structure—Modifiedinverse-iteration method[J].Spatial Structures,2002,8(4):29―35.(in Chinese)
[8]丁博涵.张弦梁结构的静力、抗震和抗风性能研究[D].杭州:浙江大学,2005.Ding Bohan.Study on static,aseismic and wind-resistantbehaviors of beam string structures[D].Hangzhou:Zhejiang University,2005.(in Chinese)
[9]赵健.内凹式索拱结构平面内极限承载力理论分析及试验研究[D].南京:东南大学,2008.Zhao Jian.Theoretical analysis and experimentalinvestigation of in-plane ultimate bearing capacity of theconcave cable-arch[D].Nanjing:Southeast University,2008.(in Chinese)
[10]樊坷,李振宝,夏兵,等.国家体育馆屋盖模型模拟地震振动台试验研究[J].北京工业大学学报,2008,34(2):159―166.Fan Ke,Li Zhenbao,Xia Bing,et al.Shaking table studyon the national gymnasium roof model[J].Journal ofBeijing University of Technology,2008,34(2):159―166.(in Chinese)
[11]尚仁杰,吴转琴,李佩勋,等.基于平衡荷载的双向张弦梁下弦拉索找形方法[J].工程力学,2008,25(3):174―181.Shang Renjie,Wu Zhuanqin,Li Peixun,et al.Theform-finding method based on balanced load of the downstring-net of bi-directional beam-string structure[J].Engineering Mechanics,2008,25(3):174―181.(inChinese)
[12]蔡建国,韩运龙,赵耀宗,冯健,张晋.空间张弦结构抗震性能研究[J].四川大学学报(工程科学版),2010,42(5):224―229.Cai Jianguo,Han Yunlong,Zhao Yaozong,Feng Jian,Zhang Jin.Study on the seismic performance of spacebeam string structures[J].Journal of Sichuan University(Engineering Science Edition),2010,42(5):224―229.(in Chinese)
[13]Kang Wenjiang,Chen Zhihua,Lam H,et al.Analysisand design of the general and outmost-ring stiffenedsuspen-dome structures[J].Engineering Structures,2003,25(13):1685―1695.
[14]Kitipornchai S,Kang Wenjiang,Lam H,et al.Factorsaffecting the design and construction of lamellasuspend-dome systems[J].Journal of Construction SteelResearch,2005,61(6):764―785.
[15]葛家琪,张国军,王树,等.2008奥运会羽毛球馆弦支穹顶结构整体稳定性能分析研究[J].建筑结构学报,2007,28(6):22―30.Ge Jiaqi,Zhang Guojun,Wang Shu,et al.The overallstability analysis of the suspend-dome structure systemof the badminton gymnasium for 2008 Olympic Game[J].Journal of Building Structures,2007,28(6):22―30.(in Chinese)
[16]涂展麒.三向张弦梁结构的力学性能分析与缺陷稳定性研究[D].南京:东南大学,2009.Tu Zhanqi.Analysis of mechanical behavior andresearch on the imperfect stability of tri-directional beamstring structure[D].Nanjing:Southeast University,2009.(in Chinese)
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