行波效应对大跨空间结构竖向构件的影响分析
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摘要
本文以西安咸阳国际机场二期扩建工程T3A航站楼主楼为工程背景,针对行波效应对大跨空间结构竖向构件的影响进行了研究探讨。分析表明,考虑行波效应后,大跨空间结构整体的层弯矩和层剪力减小,但作为竖向构件的柱内力却有所增加,传统设计工作中单纯按照一致激励设计是偏于不安全的。行波效应对大跨空间结构柱的影响与楼层、柱的位置均有关。在同一楼层内,柱内力最大值由行波效应控制的单元在平面位置分布上有一定的规律性,超载比较大的单元出现在结构平面中柱分布的四周,即角柱与边柱;各层柱的影响程度有所不同,对一层柱的影响最大,对二层柱的影响次之,对其它层(三层和四层)柱的影响较小。大跨空间结构的动力特性较为复杂,其地震作用的影响不容忽视,应进行专门研究和论证,采取有效的加强措施。
Taking Xi'an Xianyang International Airport Terminal 3 for example, the traveling-wave effects on columns of large-span spatial structure are studied. The results show that the shearing forces and moments of layer are decreased, while the column internal forces have a great degree of increase when the traveling-wave effects are considered. It is unsafe to design large-span spatial structure under uniform exiction. The effect of traveling-wave effect on large-span spatial structure column is related to the floor and position of column. On the same floor, the internal force maximum of columns has a certain regularity in the plane distribution, overload columns appear relatively large in the structure of plane column distribution around that corner and side columns; the degree of influence of each column is different. There is a greatest impact on one layer columns, then on the two layer, on the other layer(three layer and four layer) the influence is small. The dynamic characteristics of large-span spatial structure are more complex. The influence of seismic action cannot be ignored. It should be to make special research and demonstration, and take effective measures to enhance it.
Taking Xi'an Xianyang International Airport Terminal 3 for example, the traveling-wave effects on columns of large-span spatial structure are studied. The results show that the shearing forces and moments of layer are decreased, while the column internal forces have a great degree of increase when the traveling-wave effects are considered. It is unsafe to design large-span spatial structure under uniform exiction. The effect of traveling-wave effect on large-span spatial structure column is related to the floor and position of column. On the same floor, the internal force maximum of columns has a certain regularity in the plane distribution, overload columns appear relatively large in the structure of plane column distribution around that corner and side columns; the degree of influence of each column is different. There is a greatest impact on one layer columns, then on the two layer, on the other layer(three layer and four layer) the influence is small. The dynamic characteristics of large-span spatial structure are more complex. The influence of seismic action cannot be ignored. It should be to make special research and demonstration, and take effective measures to enhance it.
引文
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[2] 张毅刚,薛素铎,杨庆山,等. 大跨空间结构[M]. 北京:机械工业出版社,2004Zhang Yi-gang, Xue Su-duo, Yang Qing-shan, et al. Long-Span Spatial Structures[M]. Beijing:China Machine Press, 2004(in Chinese)
[3] James C. Anderson, Vitelmo V. Bertero. Uncertainties in Establishing Design Earthquakes[J]. Journal of Structural Engineering, 1987,113(8):1709~1724
[4] N.N.Ambrasey, J.Douglas. Near-Field Horizontal and Vertical Earthquake Ground Motions[J]. Soil Dynamics Earthquake Engineering,2003,23:1~18
[5] Allam S M, Datta T K. Analysis of Cable-Stayed Bridge Under Multi-Component Random Ground Motion by Response Spectrum Method[J]. Engineering Structures,2000,22 (10):1367~1377
[6] Eurocode 8 Structures in Seismic Regions-Design,Part 2:Bridges[S].Brussels.European Committee for Standardization.1994
[7] 陈厚群,徐泽平,李敏. 汶川大地震和大坝抗震安全[J]. 水利学报,2008,39(10):1158~1167Chen Hou-qun, Xu Ze-ping, Li Min. Wenchuan Earthquake and Seismic Safety of Large Dam[J]. Shuili Xuebao, 2008, 39(10): 1158~1167(in Chinese)
[8] 刘枫,肖从真,徐自国,等. 首都机场3号航站楼多维多点输入时程地震反应分析[J]. 建筑结构学报,2006,27(5):56~63Liu Feng, Xiao Cong-zhen, Xu Zi-guo, et al. Time-History Analysis of Terminal 3 of the Capital Airport Under Multi-Support and Multi-Dimension Seismic Excitation[J]. Journal of Building Structure, 2006, 27(5): 56~63(in Chinese)
[9] 叶继红,白学丽. 老山奥运会自行车馆在多维多点输入下的响应分析和可靠度分析[J]. 应用力学学报,2008,25(2):336~341Ye Ji-hong, Bai Xue-li. Dynamic Behaviors and Reliability of Laoshan Bicycle-Gymnasium for The Olympic Games Under Multi-Dimensional and Multi-Support Excitation[J]. Chinese Journal of Applied Mechanic. 2008, 25(2): 336~341(in Chinese)
[10] 梁嘉庆. 大跨空间结构在非一致地震输入下的弹性响应分析[D]. 南京:东南大学,2004Liang Jia-qing. Study on Elastic Vibration of Space Structures under Non-Uniform Excitations[D]. Nanjing: Southeast University, 2004(in Chinese)