某超限大跨度结构弹塑性地震反应分析
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摘要
大跨度结构的抗震分析方法主要有反应谱法、随机振动法和时程分析法,时程分析法比前两者有更高的精确度。以厦门铁路西站超限大跨度结构为背景,采用通用有限元软件ANSYS和ABAQUS建立精细化的三维分析模型,进行动力弹塑性时程分析,研究整体结构在强震作用下的动力响应和关键构件的损伤状况。分析结果表明,在罕遇地震作用下,结构的最大层间位移角小于规范限值;主塔柱在与网架结构高、低跨的连接部位,构件基本满足抗剪强度的要求,建议在塔柱中加入型钢钢骨,并增加柱腿之间连梁的配箍率,以提高柱的抗剪性能;支承网架的结构边柱在地震作用下也安全可靠;大跨度屋盖的关键构件处于弹性工作阶段,主桁架弦杆的水平和竖向位移均控制的好,钢屋盖在强震作用下具有足够的稳定性。总体来说,本结构能够在罕遇地震水平下实现"大震不倒",满足我国抗震规范的设防要求。
Seismic analysis methods of large-span structures mainly include response spectrum method, random vibration method and time history analysis method. Comparing with the first two methods, time history analysis method exhibits better accuracy. For the ultra large span structure of the Xiamen west railway station, ANSYS and ABAQUS were employed to perform three-dimensional analyses. Dynamic elasto-plastic time-history analysis was then conducted to study the dynamic response of the structure and the degree of damage of key structure members.The analysis results showed that maximal story drift of the structure under rare earthquakes can satisfy the requirement of seismic code. The joint regions where tower columns connect the grid structure with high and low spans basically can meet the shear resistance demand, and it was suggested that steel skeleton be embedded into tower columns to improve their shear performance. The side columns and steel roof are also safe under seismic action. The horizontal and vertical displacements of the main truss chords are well under control, and the steel roof is stable. Generally speaking, this building structure can fulfill the principle of ‘no collapse under seldom earthquake action' specified in the national seismic design code.
Seismic analysis methods of large-span structures mainly include response spectrum method, random vibration method and time history analysis method. Comparing with the first two methods, time history analysis method exhibits better accuracy. For the ultra large span structure of the Xiamen west railway station, ANSYS and ABAQUS were employed to perform three-dimensional analyses. Dynamic elasto-plastic time-history analysis was then conducted to study the dynamic response of the structure and the degree of damage of key structure members.The analysis results showed that maximal story drift of the structure under rare earthquakes can satisfy the requirement of seismic code. The joint regions where tower columns connect the grid structure with high and low spans basically can meet the shear resistance demand, and it was suggested that steel skeleton be embedded into tower columns to improve their shear performance. The side columns and steel roof are also safe under seismic action. The horizontal and vertical displacements of the main truss chords are well under control, and the steel roof is stable. Generally speaking, this building structure can fulfill the principle of ‘no collapse under seldom earthquake action' specified in the national seismic design code.
引文
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[2]Berrah M K,Kausel E.A modal combination rule for spatially varying seismic motions[J].Earthquake Engineering&Structural Dynamics,1993,22(9):791-800
[3]林家浩,张亚辉,赵岩.大跨度结构抗震分析方法及近期进展[J].力学进展,2001,31(3):350-360(Lin Jiahao,Zhang Yahui,Zhao Yan.Seismic analysis methods of long-span structures and recent advances[J].Advances in Mechanics,2001,31(3):350-360(in Chinese))
[4]罗永峰,杨木旺.大跨度刚性空间结构地震反应的静力弹塑性分析方法[J].建筑科学与工程学报,2008,25(3):73-80(Luo Yongfeng,Yang Muwang.Static elasto-plastic analysis method of long-span rigid spatial structures under seismic response[J].Journal of Architecture and Civil Engineering,2008,25(3):73-80(in Chinese))
[5]范峰,钱宏亮,谢礼立.最不利地震动在网壳结构抗震设计中的应用[J].世界地震工程,2003,19(3):17-21(Fan Feng,Qian Hongliang,Xie Lili.Applications of the severest ground motion to anti-seismic design for reticulated shells[J].World Information on Earthquake Engineering,2003,19(3):17-21(in Chinese))
[6]沈世钊,支旭东.球面网壳结构在强震下的失效机理[J].土木工程学报,2005,38(1):11-20(Shen Shizhao,Zhi Xudong.Failure mechanism of spherical shells subjected to dynamic loads[J].China Civil Engineering Journal,2005,38(1):11-20(in Chinese))
[7]李忠学,沈祖炎,邓长根,等.钢网壳模型的动力稳定性振动台试验研究[J].实验力学,1999,14(4):484-491(Li Zhongxue,Shen Zuyan,Deng Changgen,et al.Research on the dynamic stability of steel reticulated shells via shaking table test[J].Journal of Experimental Mechanics,1999,14(4):484-491(in Chinese))
[8]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001(GB50011—2001Code for seismic design of buildings[S].Beijing:China Architecture&Building Press,2001(in Chinese))
[9]JGJ3—2002高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002(JGJ3—2002Technical specification for concrete structures of tall building[S].Beijing:China Architecture&Building Press,2002(in Chinese))
[10]GB50010—2002混凝土结构设计规范[S].北京:中国建筑工业出版社,2002(GB50010—2002Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2002(in Chinese))
[11]郝文化.ANSYS土木工程应用实例[M].北京:中国水利水电出版社,2002
[12]王金昌,陈页开.ABAQUS在土木工程中的应用[M].杭州:浙江大学出版社,2006
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