辐射式张弦梁结构自振特性和地震响应分析
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摘要
辐射式张弦梁结构是一种新型空间结构形式,具有结构受力合理、整体刚度大、造型美观、施工简单等优点.以该结构为研究对象,应用有限元方法对结构的频率和振型进行分析,运用时程分析法计算结构在地震作用下的地震响应,针对不同参数如矢跨比、垂跨比、撑杆数、斜索预应力值及不同地震波进行参数分析,得出了各参数对辐射式张弦梁结构地震响应的影响.计算结果表明,随着矢跨比和垂跨比的增大,辐射式张弦梁结构跨中竖向位移减小;而撑杆数目、索内预应力对结构影响不大.此外这种结构由于跨度大,因此对地震作用较为敏感.
Radiant beam string structure(RBSS)is a new type of space structure.The advantages are reasonable stress of structure,great overall rigidity,handsome appearance,simple construction and so on.RBSS is taken as study object in this paper.The frequency and vibration mode of structure are analyzed through finite element method.Time history analysis is adopted to calculate seismic response of structure.Parameter analyses are conducted for the rise-span ratio,the sag-span ratio,the number of stay bar,the prestress value of oblique cable and the different seismic wave.The influence of various parameters on the seismic response of RBSS is obtained.The results show that,with the increase of rise-span ratio and the sag ratio,the midspan vertical displacement of RBSS is reduced.The number of stay bar and the prestressed cable has little influence on the structure.In addition,because of the large span of the structure,the RBSS is sensitive to the seismic function.
Radiant beam string structure(RBSS)is a new type of space structure.The advantages are reasonable stress of structure,great overall rigidity,handsome appearance,simple construction and so on.RBSS is taken as study object in this paper.The frequency and vibration mode of structure are analyzed through finite element method.Time history analysis is adopted to calculate seismic response of structure.Parameter analyses are conducted for the rise-span ratio,the sag-span ratio,the number of stay bar,the prestress value of oblique cable and the different seismic wave.The influence of various parameters on the seismic response of RBSS is obtained.The results show that,with the increase of rise-span ratio and the sag ratio,the midspan vertical displacement of RBSS is reduced.The number of stay bar and the prestressed cable has little influence on the structure.In addition,because of the large span of the structure,the RBSS is sensitive to the seismic function.
引文
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[4]王秀丽,丁南生,柴宏.大跨度张弦梁结构非线性地震响应及参数分析[J].空间结构,2006,12(2):34-38.WANG Xiu-li,DING Nan-sheng,CHAI Hong.Seismicresponse and parametric analysis of beam string struc-tures[J].Spatial Structure,2006,12(2):34-38.
[5]刘永周.张弦立体桁架结构力学性能分析[D].兰州:兰州理工大学,2004.LIU Yong-zhou.Analysis of Mechanical Behavior ofPrestressed Spatial Truss String Structure[D].Lanzhou:Lanzhou University of Technology,2004.
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[2]陈军明,陈应波,吴代华.单层球面网壳结构地震响应的动力时程分析[J].空间结构,1999,5(4):15-20.CHEN Jun-ming,CHEN Ying-bo,WU Dai-hua.Directdynamic analysis of single layer reticulated sphericalshell subjected to earthquake action[J].Spatial Struc-ture,1999,5(4):15-20.
[3]刘锡良,白正仙.张弦梁结构受力性能的分析[J].结构设计,1998,13(4):4-8.LIU Xi-liang,BAI Zheng-xian.Analysis of mechanicalbehaviour of beam string structure[J].Structural De-sign,1998,13(4):4-8.
[4]王秀丽,丁南生,柴宏.大跨度张弦梁结构非线性地震响应及参数分析[J].空间结构,2006,12(2):34-38.WANG Xiu-li,DING Nan-sheng,CHAI Hong.Seismicresponse and parametric analysis of beam string struc-tures[J].Spatial Structure,2006,12(2):34-38.
[5]刘永周.张弦立体桁架结构力学性能分析[D].兰州:兰州理工大学,2004.LIU Yong-zhou.Analysis of Mechanical Behavior ofPrestressed Spatial Truss String Structure[D].Lanzhou:Lanzhou University of Technology,2004.
[6]GB50011-2001.建筑抗震设计规范.[S].北京:中国建筑工业出版社,2001.
[7]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.
[8]蓝天,张毅刚.大跨度屋盖结构抗震设计[M].北京:中国建筑工业出版社,2000.
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