铁路客站大跨叠层桁架结构受力分析
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摘要
跨度52m的钢结构大跨叠层桁架是西安火车站站改工程重要组成部分。通过建立大跨叠层桁架的整体有限元模型,对整体结构进行全面的静力分析和自振特性分析。静力分析着重研究结构整体变形和应力比,分析不同荷载工况作用下结构变形特征;自振特性分析在研究叠层桁架自振特性的基础上,分析改变桁架腹杆形式对结构自振特性的影响。计算结果表明:构件的变形及应力比均满足《钢结构设计规范》(GB50017—2003)的规定,结构整体位移分布一般呈现正对称特征,大跨叠层桁架的最大位移区域位于跨中位置;大跨叠层桁架具有较低的自振频率,腹杆形式的改变对其自振频率的影响不大。
Steel truss long-span multilayer truss with 52 m span is an important part of the station transformation project in Xi'an Railway Station. Through the establishment of the integrated finite element model of large span laminated truss,the overall static analysis and vibration characteristic analysis are carried out. The static analysis focuses on the overall deformation and stress ratio of the structure,and addresses the structural deformation characteristics under different load conditions. The analysis of the self-vibration characteristics of the laminated truss is dedicated to identifying the influence of the change of truss web member on the natural vibration characteristics of the structure. The calculation results show that the deformation and stress ratio of structural members are all satisfied with the specification of The Code for Design of Steel Structures( GB50017—2003). The overall displacement distribution of the structure generally presents positive symmetry, the maximum displacement area of the large span laminated truss is located in the mid span,and the large span laminated truss has a lower frequency of vibration and the change of the abdominal rod form has little effect on the natural frequency.
Steel truss long-span multilayer truss with 52 m span is an important part of the station transformation project in Xi'an Railway Station. Through the establishment of the integrated finite element model of large span laminated truss,the overall static analysis and vibration characteristic analysis are carried out. The static analysis focuses on the overall deformation and stress ratio of the structure,and addresses the structural deformation characteristics under different load conditions. The analysis of the self-vibration characteristics of the laminated truss is dedicated to identifying the influence of the change of truss web member on the natural vibration characteristics of the structure. The calculation results show that the deformation and stress ratio of structural members are all satisfied with the specification of The Code for Design of Steel Structures( GB50017—2003). The overall displacement distribution of the structure generally presents positive symmetry, the maximum displacement area of the large span laminated truss is located in the mid span,and the large span laminated truss has a lower frequency of vibration and the change of the abdominal rod form has little effect on the natural frequency.
引文
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[3]吕晓静.张弦空间桁架的静力性能及稳定性分析[D].西安:西安建筑科技大学,2003.
[4]赵宪波.张弦梁(桁架)结构形状确定及静力性能分析[D].南京:东南大学,2005.
[5]郜京锋.某体育馆斜拉空间析架的静力与稳定研究[D].西安:西安建筑科技大学,2005.
[6]夏林.某柔性连接钢结构连廊设计[J].建筑结构,2016,46(S1):501-506.
[7]韩庆华,裴波,王成博,等.预应力组合网架结构的自振特性分析及现场测试[J].地震工程与工程振动,2004,24(2):118-124.
[8]周岱,沈祖炎.斜拉网壳结构的构件分析和非线性动力计算[J].土木工程学报,1999,32(6):40-46.
[9]严慧,熊卫,唐曹明.斜拉网架结构静力、动力特性的研究[C]∥第三届全国结构工程学术会议论文集(下),1994:1379-1384.
[10]顾德敏,王爱国.某游泳跳水馆钢屋盖结构自振特性和风振动力响应分析[J].钢结构,2002,17(1):35-38.
[11]陕西省建设厅.DBJ 61—6—2006西安地裂缝场地勘察与工程设计规程[S].西安:陕西省建设厅,2006.
[12]中华人民共和国住房和城乡建设部.GB50009—2012建筑结构荷载规范[S].北京:中国建筑工业出版社,2012.
[13]中华人民共和国建设部.GB50017—2003钢结构设计规范[S].北京:中国计划出版社,2003.
[14]中华人民共和国建设部.GJJ69—95城市人行天桥与人行地道规程[S].北京:中国建筑工业出版社,1996.