轮辐式大跨度张拉结构地震反应分析(Ⅰ)
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摘要
以世纪莲体育中心轮辐式大跨度张拉索膜结构为研究对象,采用ANSYS程序,建立有限元模型,分析地震波作用下结构的动力特性。结果表明:结构竖向刚度较小,垂跨比达到1/1 152;多遇烈度下的层间位移角达到1/467,水平向位移不可忽视;峰值加速度相同时,不同类型的地震波对该结构的地震反应差别不大;峰值加速度出现的先后对结构的振动影响甚微;随地震波峰值加速度增大,拉索轴应力几乎不变,但上、下压环及腹杆的弯曲应力变化较大;设计时,地震作用必须参与荷载组合,且应考虑地震波不同方向及多维组合作用的影响。
Using the program,ANSYS,a finite element model of the rung-shape long-span tensile cable-membrane structure in Foshan Century Lotus Stadium was set up to investigate its dynamic performance under earthquake waves.Results show that the structure’s vertical stiffness is weak,and its sag-to-span ratio is 1 /1 152.Because its story drift is 1 /467,the structure’s horizontal displacement should not be neglect.The structure’s seismic responses are similar under different types of earthquake waves when their peak-accelerations are equal.At the same time,the order of the acceleration reaching its peak has small effects on the vibration of the structure.With the increase of the peak-acceleration,the axis stress of the tension cables does not vary,but the bending stress of the upper compression ring,the lower compression ring,and the truss web,has obviously changed.During the design process,seismic loading should be calculated in the load combination.Furthermore,the effects of the waves’direction and their combination should be considered.
Using the program,ANSYS,a finite element model of the rung-shape long-span tensile cable-membrane structure in Foshan Century Lotus Stadium was set up to investigate its dynamic performance under earthquake waves.Results show that the structure’s vertical stiffness is weak,and its sag-to-span ratio is 1 /1 152.Because its story drift is 1 /467,the structure’s horizontal displacement should not be neglect.The structure’s seismic responses are similar under different types of earthquake waves when their peak-accelerations are equal.At the same time,the order of the acceleration reaching its peak has small effects on the vibration of the structure.With the increase of the peak-acceleration,the axis stress of the tension cables does not vary,but the bending stress of the upper compression ring,the lower compression ring,and the truss web,has obviously changed.During the design process,seismic loading should be calculated in the load combination.Furthermore,the effects of the waves’direction and their combination should be considered.
引文
[1]CECS 158∶2004膜结构技术规程[S].
[2]清华大学,西南交通大学,北京交通大学土木工程结构专家组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9.
[3]叶列平,曲哲,陆新征.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.
[4]马玉宏,谢礼立,赵桂峰.抗震设防烈度的决策分析方法研究[J].世界地震工程,2007,23(1):86-90.
[5]GB 50011—2001建筑抗震设计规范[S].
[6]孙文波,王剑文,刘永桂,等.车辐式大跨度张拉索膜结构的自振和静风作用分析[J].工业建筑,2007,37(增刊):672-675.
[7]王文胜,薄燕培,胡庆卫.佛山世纪莲体育中心索膜结构[C]∥第十一届空间结构学术会议论文集.南京:2005.
[2]清华大学,西南交通大学,北京交通大学土木工程结构专家组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9.
[3]叶列平,曲哲,陆新征.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.
[4]马玉宏,谢礼立,赵桂峰.抗震设防烈度的决策分析方法研究[J].世界地震工程,2007,23(1):86-90.
[5]GB 50011—2001建筑抗震设计规范[S].
[6]孙文波,王剑文,刘永桂,等.车辐式大跨度张拉索膜结构的自振和静风作用分析[J].工业建筑,2007,37(增刊):672-675.
[7]王文胜,薄燕培,胡庆卫.佛山世纪莲体育中心索膜结构[C]∥第十一届空间结构学术会议论文集.南京:2005.
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