基于几何参数的优化对双层柱面网壳结构动力性能的影响
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摘要
以双层柱面网壳为研究对象,采用参数化设计语言APDL对AN SY S进行二次开发,实现了任意跨度双层柱面网壳的自动建模、加载、施加约束及求解。借此平台对柱面网壳结构进行模态和地震反应分析。首先,分析了结构自振特性随几何参数变化的特点,研究了结构的基频随矢跨比和网壳厚度的变化规律,结果表明,当矢跨比在1/3.6~1/5该范围内,结构的整体刚度较大;网壳厚度在1.8~2.1 m时,网壳整体刚度较大;对于矢跨比一定的网壳,随着厚度的增加,杆件的动内力大多增加,横向弦杆的二维与单维动内力比值有所增加,而纵向弦杆的二维与单维动内力则变化不大。然后,对网壳进行不同几何参数下的地震反应分析,给出了最大节点位移和最大杆件轴应力随几何参数变化的时程响应曲线,揭示了这类网壳的地震反应特点。
Double-layer cylindrical shell was studied.ANSYS was secondarily developed by APDL,and automatically modeling,loading,adding constraints and solving of double-layer cylindrical shell with random span have been carried out.Mode and transient analysis has been analyzed based on it.The characteristics of structural natural vibration was firstly analyzed according to geometrical parameters,and natural frequency's rule of structure has been studied according to ratio of rise to span and shell thickness.The result show that the stiffness is larger when ratio of rise to span is between 1/5 to 1/3.6 and thickness is among 1.8 m to 2.4 m;Dynamic internal force of bars will increase along with increasing thickness and constant ratio of rise to span,and the dynamic internal force ratio of two-dimensional to one-dimensional also increase more or less,but the bar's force in longitudinal direction changed insignificantly.Time response curves of maximal displacement and axial stress have been drawn under seismic effect,and seismic performance of the shell has been derived.
Double-layer cylindrical shell was studied.ANSYS was secondarily developed by APDL,and automatically modeling,loading,adding constraints and solving of double-layer cylindrical shell with random span have been carried out.Mode and transient analysis has been analyzed based on it.The characteristics of structural natural vibration was firstly analyzed according to geometrical parameters,and natural frequency's rule of structure has been studied according to ratio of rise to span and shell thickness.The result show that the stiffness is larger when ratio of rise to span is between 1/5 to 1/3.6 and thickness is among 1.8 m to 2.4 m;Dynamic internal force of bars will increase along with increasing thickness and constant ratio of rise to span,and the dynamic internal force ratio of two-dimensional to one-dimensional also increase more or less,but the bar's force in longitudinal direction changed insignificantly.Time response curves of maximal displacement and axial stress have been drawn under seismic effect,and seismic performance of the shell has been derived.
引文
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[2]郭永昌,李丽娟,谢志红,等.双层球面网壳结构的抗震性能分析[J].空间结构,2005,11(4):36-39.Guo Y C,Li L J,Xie Z H,et al.Antiseismic analysisof double-layer grid shell structures[J].SpatialStructures,2005,11(4):36-39.
[3]Clough R W,Penzien J.Dynamic of Structure[M].New York:McGraw-Hill,Inc.,1993.
[4]薛素铎,曹资,王建宁.单层柱面网壳弹塑性地震反应特征[J].地震工程与工程振动,2002,22(1):56-60.Xue S D,Cao Z,Wang J N.Elastic-plastic seismicresponse of single-layer cylindrical lattice shell[J].Earthquake Engineering and Engineering Vibration,2002,22(1):56-60.
[5]邢佶慧,沈世钊.单层柱面网壳结构强震作用下抗震性能研究[J].中国安全科学学报,2004,14(11):8-14.Xing J H,Shen S Z.Study on anti-seismicperformance of single-layer latticed cylindrical shellunder severe earthquake[J].China Safety ScienceJournal,2004,14(11):8-14.
[6]殷志祥,郭影.拉索预应力双层柱面网壳结构布索方案研究[J].建筑钢结构进展,2005,7(4):47-49.Yin Z X,Guo Y.Investigation on layout of cables forprestressed lattice shell structure of double-layercylindrical shell[J].Progress in Steel BuildingStructures,2005,7(4):47-49.
[7]邢佶慧,柳旭东,范峰,等.单层柱面网壳结构地震模拟振动台试验研究[J].建筑结构学报,2004,25(6):1-8.Xing J H,Liu X D,Fan F,et al.Shaking tableexperiment research on aseismic behavior of singe-layer latticed cylindrical shell[J].Journal of BuildingStructures,2004,25(6):1-8.
[8]博弈创作室.ANSYS9.0经典产品高级分析技术与实例详解[M].北京:中国水利出版社,2005.1-20.Game workshop.ANSYS9.0 Critical ProductAnalytical Technique and Example Expounding[M].Beijing:China Hydrological Press,2005.1-20.
[9]陆赐麟,尹思明,刘锡良.现代预应力钢结构(修订版)[M].北京:人民交通出版社.2007.238-254.Lu C L,Yin S M,Liu X L.Modern Prestressed SteelStructure(revision)[M].Beijing:People TrafficPress,2007.238-254.
[10]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.13-50.Cao Z,Xue S D.Seismic Analysis and Design ofSpatial Structure[M].Beijing:Science Press,2005.13-50.
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