雅丹观光塔钢屋盖不规则双层网格结构设计研究
|
摘要
甘肃雅丹地貌观光塔的一层塔座外观奇特,选用了不规则的双层钢网格结构作为其一层的屋盖。本文利用大型通用有限元分析软件ANSYS和空间网格结构计算机辅助设计软件(MST2010)分别对雅丹观光塔不规则双层网格钢屋盖结构进行了地震作用非线性时程分析以及风荷载作用分析;根据分析结果初步得到结构的关键杆件,并假设部分杆件受损对结构进行剩余承载力损伤评价。结果表明,不规则网格钢屋面不仅能够很真实地体现出建筑外观,而且还具有传统规则形式空间结构优良的抗震性能和抗风性能,结构设计满足要求;假设结构部分杆件出现损伤后,通过结构剩余承载力评价的方法能够找出结构的关键杆件,为后期的施工与使用提供指导。
As architecture breaks away from traditional styles,grid structures with irregular spacing are in demand to meet construction requirements.An example of current architectural style is the Yadan sightseeing tower,which has an irregular double-layer steel grid roof.In this work,the engineering of such structures was reviewed and analyzed,and analysis and calculation of layered steel roof structures under seismic and wind loads were performed.The calculations assumed that part of the bar was damaged,and a damage assessment of the residual bearing capacity was conducted.Next,a finite element model that illustrated the loads imposed on the structure was built with analysis software.Then,a nonlinear time history analysis of earthquakes and a natural vibration analysis were done with the ANSYS finite element analysis software.Displacement curves showing the time history of key nodes and the stresses on key bars were obtained.Wind load analysis using computer-aided design software of the space grid structure(MST2010)was done,and displacement and stress distributions were obtained.Last,the analysis results indicated that some of the key bars assessed preliminarily might be damaged,so a damage assessment of the residual bearing capacity of the structure was undertaken.The results showed that the irregularly spaced grid structure in this project can be adapted to the current trends in architectural style.The grid not only reflects current architectural style but also has excellent seismic and wind resistance performances,similar to those of the traditional spatial structure.Therefore,irregularly spaced grid structures are appropriate for use in similar projects with steel roofs.To assess earthquake response,the structure was subjected to structural vibration modes,and the weak parts were the head,tail,wings,and joints.Horizontal stiffness was greater than vertical stiffness.The structure was in a fully elastic state under the effects of multiple earthquakes;however,only aportion of the bar yielded under this rare earthquake scenario,and plastic deformation appeared in accordance with the basic principles of structural design.Parts of the bearing bars section should be increased at design time because it is a key member of the entire structure.Because a streamline design was adopted to resist wind,the design of this structure satisfies the requirements for wind resistance even in a hostile environment.In this study,the key bar calculations were very important to the bearing capacity of the structure.During structure construction and in service,great importance should be given to these bars.Once damage appears,the bars should be reinforced in a timely manner.The caseload design and analysis results can be combined for some practical projects,assuming some structural failure and through a method to evaluate structural residual strength to identify the key bars in the structure.Such projects would provide guidance for the structure's construction and later use.
As architecture breaks away from traditional styles,grid structures with irregular spacing are in demand to meet construction requirements.An example of current architectural style is the Yadan sightseeing tower,which has an irregular double-layer steel grid roof.In this work,the engineering of such structures was reviewed and analyzed,and analysis and calculation of layered steel roof structures under seismic and wind loads were performed.The calculations assumed that part of the bar was damaged,and a damage assessment of the residual bearing capacity was conducted.Next,a finite element model that illustrated the loads imposed on the structure was built with analysis software.Then,a nonlinear time history analysis of earthquakes and a natural vibration analysis were done with the ANSYS finite element analysis software.Displacement curves showing the time history of key nodes and the stresses on key bars were obtained.Wind load analysis using computer-aided design software of the space grid structure(MST2010)was done,and displacement and stress distributions were obtained.Last,the analysis results indicated that some of the key bars assessed preliminarily might be damaged,so a damage assessment of the residual bearing capacity of the structure was undertaken.The results showed that the irregularly spaced grid structure in this project can be adapted to the current trends in architectural style.The grid not only reflects current architectural style but also has excellent seismic and wind resistance performances,similar to those of the traditional spatial structure.Therefore,irregularly spaced grid structures are appropriate for use in similar projects with steel roofs.To assess earthquake response,the structure was subjected to structural vibration modes,and the weak parts were the head,tail,wings,and joints.Horizontal stiffness was greater than vertical stiffness.The structure was in a fully elastic state under the effects of multiple earthquakes;however,only aportion of the bar yielded under this rare earthquake scenario,and plastic deformation appeared in accordance with the basic principles of structural design.Parts of the bearing bars section should be increased at design time because it is a key member of the entire structure.Because a streamline design was adopted to resist wind,the design of this structure satisfies the requirements for wind resistance even in a hostile environment.In this study,the key bar calculations were very important to the bearing capacity of the structure.During structure construction and in service,great importance should be given to these bars.Once damage appears,the bars should be reinforced in a timely manner.The caseload design and analysis results can be combined for some practical projects,assuming some structural failure and through a method to evaluate structural residual strength to identify the key bars in the structure.Such projects would provide guidance for the structure's construction and later use.
引文
[1]王秀丽.大跨空间钢结构分析与概念设计[M].北京:机械工业出版社.2008.WANG Xiu-li.Analysis and Concept Design of Large Span Spatitial Structure[M].Beijing:China Machine Press,2008.(in Chinese)
[2]夏坤,张令心;刘洁平.建筑物高低层地震反应差异研究[J].西北地震学报,2011,33(3):284-290.XIA Kun,Zhang Lin-xin,LIU Jie-ping.Study on Difference between Seismic Response of Lower Stories and that of Higher Stories of Building[J].Northwestern Seismologigal Journal,2011,33(3):284-290.(in Chinese)
[3]杜永峰,仲彬.施工过程中隔震层钢筋砼梁变形初步分析[J].地震工程学报,2013,35(1):29-41.DU Yong-feng,WEI Zhong-bin.Preliminary Analysis on Deformation of Reinforced Concrete Beam of Isolation Layer during Construction Process[J].China Earthquake Engineering Journal,2013,35(1):29-41.(in Chinese)
[4]郭安宁,郭增建,焦姣.青海玉树7.1级大震的预测讨论[J].西北地震学报,2012,34(1):39-43.GUO An-ning,GUO Zeng-jian,JIAO jiao.Discussion on the Prediction of the Yushu MS7.1Earthquake in Qinghai province in 2010[J].Northwestern Seismological Journal,2012,34(1):39-43.(in Chinese)
[5]刘进军,刘枫,朱礼敏,等.中国航海博物馆曲面幕墙单层索网结构设计[J].建筑结构,2011,41(3):7-10.LIU Jun-jin,LIU Feng,ZHU Li-min,et al.Structure Design of Single Layer Cable Net Curve Curtain Wall of China Maritime Museum[J].Building Structure,2011,41(3):7-10.(in Chinese)
[6]薛素铎,赵均,高向宇.建筑抗震设计[M].北京:科学出版社,2005.XUE Su-duo,ZHAO Jun,GAO Xiang-yu.Seismic Design of Buildings[M].Beijing:Science Press,2005.(in Chinese)
[7]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37.YANG Fu,LI Ying-ming,NAI Ming.A New Method for Selecting Inputing Waves for Time-history Analysis[J].China Civil Engineering Journal,2000,33(6):33-37.(in Chinese)
[8]刘飞,汪大海,许敏.某超限大跨度结构弹塑性地震反应分析[J].土木工程学报,2010,43(11):27-36.LIU Fei,WANG Da-hai,XU Min.Analysis of the Elastoplastic Seismic Response of An Ultra Large Span Structure[J].China Civil Engineering Journal,2010,43(11):27-36.(in Chinese)
[2]夏坤,张令心;刘洁平.建筑物高低层地震反应差异研究[J].西北地震学报,2011,33(3):284-290.XIA Kun,Zhang Lin-xin,LIU Jie-ping.Study on Difference between Seismic Response of Lower Stories and that of Higher Stories of Building[J].Northwestern Seismologigal Journal,2011,33(3):284-290.(in Chinese)
[3]杜永峰,仲彬.施工过程中隔震层钢筋砼梁变形初步分析[J].地震工程学报,2013,35(1):29-41.DU Yong-feng,WEI Zhong-bin.Preliminary Analysis on Deformation of Reinforced Concrete Beam of Isolation Layer during Construction Process[J].China Earthquake Engineering Journal,2013,35(1):29-41.(in Chinese)
[4]郭安宁,郭增建,焦姣.青海玉树7.1级大震的预测讨论[J].西北地震学报,2012,34(1):39-43.GUO An-ning,GUO Zeng-jian,JIAO jiao.Discussion on the Prediction of the Yushu MS7.1Earthquake in Qinghai province in 2010[J].Northwestern Seismological Journal,2012,34(1):39-43.(in Chinese)
[5]刘进军,刘枫,朱礼敏,等.中国航海博物馆曲面幕墙单层索网结构设计[J].建筑结构,2011,41(3):7-10.LIU Jun-jin,LIU Feng,ZHU Li-min,et al.Structure Design of Single Layer Cable Net Curve Curtain Wall of China Maritime Museum[J].Building Structure,2011,41(3):7-10.(in Chinese)
[6]薛素铎,赵均,高向宇.建筑抗震设计[M].北京:科学出版社,2005.XUE Su-duo,ZHAO Jun,GAO Xiang-yu.Seismic Design of Buildings[M].Beijing:Science Press,2005.(in Chinese)
[7]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37.YANG Fu,LI Ying-ming,NAI Ming.A New Method for Selecting Inputing Waves for Time-history Analysis[J].China Civil Engineering Journal,2000,33(6):33-37.(in Chinese)
[8]刘飞,汪大海,许敏.某超限大跨度结构弹塑性地震反应分析[J].土木工程学报,2010,43(11):27-36.LIU Fei,WANG Da-hai,XU Min.Analysis of the Elastoplastic Seismic Response of An Ultra Large Span Structure[J].China Civil Engineering Journal,2010,43(11):27-36.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心