张弦梁(桁架)结构两端张拉施工找形方法——分级卸载法
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摘要
对张弦梁(桁架)结构的找形问题进行了深入研究,根据该类结构的受力特点,提出了分级卸载法,并应用于该类结构两端张拉施工过程的找形分析。该方法无需假定结构零状态几何,而可以一次得到对应于初状态(即预应力态)几何的结构施工放样尺寸(即零状态几何),并通过分级加载对该方法的精度进行了检验。
The problem concerning form finding of the beam(truss)string structures is studied and the method named offloading by steps is put forward in accordance with the mechanical behavior of the structures.The method can be applied to the form finding of the beam string structures stretched at both ends.Without assuming the form of unstrained state,the form of unstrained state corresponding to that of pre-stressed state can be obtained through this method directly.Finally the method proposed is verified by the numerical solution of loading by steps.
The problem concerning form finding of the beam(truss)string structures is studied and the method named offloading by steps is put forward in accordance with the mechanical behavior of the structures.The method can be applied to the form finding of the beam string structures stretched at both ends.Without assuming the form of unstrained state,the form of unstrained state corresponding to that of pre-stressed state can be obtained through this method directly.Finally the method proposed is verified by the numerical solution of loading by steps.
引文
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[2]白正仙,刘锡良,李义生.新型空间结构形式——张弦梁结构[J].空间结构,2001,7(2):33～38.Bai Zhengxian,Liu Xiliang,Li Yisheng.A new spatial structure—beam string structure[J].Spatial Structure,2001,7(2):33～38.(in Chinese)
[3]董石麟.预应力大跨度空间钢结构的应用与展望[J].浙江建筑,2002,(增刊):1～10.Dong Shilin.Application and prospect of the long-span spatial prestressed steel structure[J].Zhejiang Achitecture,2002,(Sup.):1～10.(in Chinese)
[4]刘开国.大跨度张弦梁式结构的分析[J].空间结构,2001,7(2):39～43,53.Liu Kaiguo.Study of the long-span beam string structure[J].Spatial Structure,2001,7(2):39～43,53.(in Chinese)
[5]张其林.索和膜结构[M].上海:同济大学出版社,2002.Zhang Qilin.Cable structure and membrane structure[M].Shanghai:Tongji University Press,2002.(in Chinese)
[6]张其林,张莉,罗晓群.预应力索屋盖结构的形状确定[J].同济大学学报,2000,28(增刊):379～382.Zhang Qilin,Zhang Li,Luo Xiaoqun.Shape finding of prestressed cable roofs[J].Journal of Tongji University,2000,28(sup.):379～382.(in Chinese)
[7]张其林,张莉.预应力梁—索屋盖形状确定[C].萧山:第九届空间结构学术会议论文集,2000.Zhang Qilin,Zhang Li.Shape finding of prestressed beam-cable roofs[C].Xiaoshan:Theses of the9th Spatial Structure Conference,2000.(in Chinese)
[8]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.Shape finding of prestressed beam string structure—the ameliorated athwart iterative method[J].Spatial Structure,2002,8(4):29～35.(in Chinese)
[9]江见鲸,宋昆仑,傅德炫.土建工程实用程序选编[M].北京:地震出版社,1992.Jiang Jianjing,Song Kunlun,Fu Dexuan.The collection of applied program for structure engineering[M].Beijing:Seism Press,1992.(in Chinese)
[10]曾小飞.悬索结构初始形状确定及优化[D].南京:东南大学土木工程学院,2004.Zeng Xiaofei.Study on form finding and form optimization of pretensioned cable roofs[D].Nanjing:The College of Civil Engineering,Southeast University,2004.(in Chinese)
[11]沈世钊,徐崇宝,赵臣.悬索结构设计[M].北京:中国建筑工业出版社,1997.Sheng Shizhao,Xu Chongbao,Zhao Chen.Design of cable structures[M].Beijing:China Architecture&Building Press,1997.(in Chinese)
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