弦支筒壳结构在多点输入下的地震响应分析
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摘要
将拉索与柱面网壳相结合,就可以形成新的弦支结构——弦支筒壳结构.以一实际工程为例,本文将分别采用地震波一致输入和考虑行波效应的多点输入分析方法对弦支筒壳进行地震响应分析.结果表明,地震作用下单层筒壳杆件内力和撑杆内力随时间的变化都是在某一数值上下波动,而下弦索内力随时间的变化则是波动着上升.与一致输入相比,多点输入时,单层筒壳杆件内力有些发生了方向改变,有较少一部分内力减小,大部分杆件的内力增大,且随着行波速度的减小,内力增大的杆件增多,幅度加大;一部撑杆的内力增大,也有相当一部分撑杆的内力减小,且随着行波速度的增大,二者对撑杆内力的影响趋于相同;下弦索中拉力或者增大或者趋于与一致输入时相同,且随着行波速度的增大,二者对下弦索中拉力的影响趋于相同.
By combining cables and the cylindrical latticed shell,a new-style cable supported structure-cable supported barrel vault structure is formed.In this paper,a practical project is taken for example.The seismic response analysis of the cable supported barrel vault is carried out by the method of single support excitation and multi-support excitations considering the earthquake wave passage effect respectively.Some conclusions are drawn as follows: under the action of earthquake,both the stress of rods in the single-layer cylindrical latticed shell and struts fluctuate around a fixed value as the time changes,but the stress of cables ascend in a fluctuated curve.Comparing with the single support excitation,under multi-support excitations,the action direction of the stress of some rods in the single-layer cylindrical latticed shell change,the stress of a few rods diminish,most of rods' stress augment.Moreover,the amount of rods whose stress augment increases and the augment extent of stress enhance as the traveling wave speed diminish.The stress of some struts augment,but in the meantime,some diminish,and the influence of multi-support excitations and the single support excitation on the stress of struts are going to be the same as the traveling wave speed augment.The stress of cables either augment or tend to be the same to that under the single support excitation,and the influence of multi-support excitations and single support excitation on the stress of cables are going to be the same as the traveling wave speed augment.
By combining cables and the cylindrical latticed shell,a new-style cable supported structure-cable supported barrel vault structure is formed.In this paper,a practical project is taken for example.The seismic response analysis of the cable supported barrel vault is carried out by the method of single support excitation and multi-support excitations considering the earthquake wave passage effect respectively.Some conclusions are drawn as follows: under the action of earthquake,both the stress of rods in the single-layer cylindrical latticed shell and struts fluctuate around a fixed value as the time changes,but the stress of cables ascend in a fluctuated curve.Comparing with the single support excitation,under multi-support excitations,the action direction of the stress of some rods in the single-layer cylindrical latticed shell change,the stress of a few rods diminish,most of rods' stress augment.Moreover,the amount of rods whose stress augment increases and the augment extent of stress enhance as the traveling wave speed diminish.The stress of some struts augment,but in the meantime,some diminish,and the influence of multi-support excitations and the single support excitation on the stress of struts are going to be the same as the traveling wave speed augment.The stress of cables either augment or tend to be the same to that under the single support excitation,and the influence of multi-support excitations and single support excitation on the stress of cables are going to be the same as the traveling wave speed augment.
引文
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[12]KI UREGHIAN A D,NEUENHOFER A.Responsespectrum method for multi-support seismic excitations[J].Earthquake Engineering and Structural Dynam-ics,1992,21(8):713-40.
[13]HEREDIA-ZZVONI E,VANMARCKE E H.Seismicrandom-vibration analysis of multi-support structuralsystems[J].Journal of Engineering Mechanics,ASCE,1994,120(5):1107-28.
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[15]LOH C H,LEE S Z.Aseismic displacement analysisof multi-supported bridge to multiple excitations[J].Soil Dynamics and Earthquake Engineering,1990,9(1):25-33.
[16]HAO H.Arch responses to correlated multiple excita-tions[J].Earthquake Engineering and StructuralDynamics,1993,22:389-404.
[17]SU Liang,DONGShilin,KATOShiro.Seismic designfor steel trussed arch to multi-support excitations[J].Journal of Constructional Steel Research,2007,63:725-734.
[18]LOH C H,YEH Y T.Spatial variation and stochasticmodeling of seismic differential ground movement[J].Earthquake Engineering and Structural Dynamics,1988,16:583-596.
[19]LINJ H,WILLIAMS F W,ZHANG WS.Anewap-proach to multi-excitation stochastic seismic response[J].Micro Computers in Civil Engineering,1993,8(4):283-290.
[20]李杰,李国强.地震工程学导论[M].北京:地震出版社,1994.
[2]SAITOH Masao,TOSIYA Kurasiro.Astudy on struc-tural behaviors of beamstring structure[A].Summariesof Technical Papers of Annual Meeting Architectural In-stitute of Japan[C],1985:280-284.
[3]SAITOH Masao,OKASA Akira.The role of string inhybrid string structure[J].Engineering Structures,1999,21(8):756-69.
[4]白正仙,刘锡良,李义生.新型空间结构形式——张弦梁结构[J].空间结构,2001,7(2):33-38.BAI Zheng-xian,LI U Xi-liang,LI Yi-sheng.New-stylespatial structure-beam string structure[J].SpatialStructures,2001,7(2):33-38.
[5]KAWAGUCHI Mamoru,ABE Masaru,TATEMICHIIkuo.Design,tests and realization of“suspen-dome”system[J].Journal of the IASS,1999,40(131):179-192.
[6]陈志华.弦支穹顶结构体系及其结构特性分析[J].建筑结构,2004,34(5):38-41.CHEN Zhi-hua.Suspen-dome structure system and a-nalysis on structural characteristics[J].Building Struc-ture,2004,34(5):38-41.
[7]范立础,王君杰,陈玮.非一致地震激励下大跨度斜拉桥的响应特性[J].计算力学学报,2001,18(3):359-363.FAN Li-chu,WANG Jun-jie,CHEN Wei.Responsecharacteristics of long-span cable-stayed bridges undernon-uniformseismic action[J].Chinese Journal of Com-putationai Mechanics,2001,18(3):359-363.
[8]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.PAN Dan-guang,LOU Meng-lin,FAN Li-chu.Statusof seismic response analysis of long-span structures un-der multiple support excitations[J].Journal of TongjiUniversity,2001,29(10):1213-1219.
[9]丁阳,王波.大跨度空间网格结构在地震行波作用下的响应[J].地震工程与工程振动,2002,22(5):71-76.DING Yang,WANG Bo.Seismic response of long-spanspatial lattice structure considering traveling-waveeffects[J].Earthquake Engineering and Engineering Vi-bration,2002,22(5):71-76.
[10]罗尧治,王荣.索穹顶结构动力特性及多维多点抗震性能研究[J].浙江大学学报,2005,39(1):39-45.LUO Yao-zhi,WANG Rong.Study on dynamic char-acteristics and behavior of cable dome subjected tomulti-di mensional and multi-point seismic excitations[J].Journal of Zhejiang University,2005,39(1):39-45.
[11]王秀丽,丁南生,柴宏.大跨度张弦梁结构非线性地震响应及参数分析[J].空间结构,2006,12(2):34-38.WANG Xiu-li,DING Nan-sheng,CHAI Hong.Seis-mic response and parametric analysis of beam stringstructures[J].Spatial Structures,2006,12(2):34-38.
[12]KI UREGHIAN A D,NEUENHOFER A.Responsespectrum method for multi-support seismic excitations[J].Earthquake Engineering and Structural Dynam-ics,1992,21(8):713-40.
[13]HEREDIA-ZZVONI E,VANMARCKE E H.Seismicrandom-vibration analysis of multi-support structuralsystems[J].Journal of Engineering Mechanics,ASCE,1994,120(5):1107-28.
[14]LINJ H,ZHANG Y H,LI Q S,WILLIAMS F W.Seismic spatial effects for long-span bridges using thepseudo excitation method[J].Engineering Structures,2004,26(9):1207-1216.
[15]LOH C H,LEE S Z.Aseismic displacement analysisof multi-supported bridge to multiple excitations[J].Soil Dynamics and Earthquake Engineering,1990,9(1):25-33.
[16]HAO H.Arch responses to correlated multiple excita-tions[J].Earthquake Engineering and StructuralDynamics,1993,22:389-404.
[17]SU Liang,DONGShilin,KATOShiro.Seismic designfor steel trussed arch to multi-support excitations[J].Journal of Constructional Steel Research,2007,63:725-734.
[18]LOH C H,YEH Y T.Spatial variation and stochasticmodeling of seismic differential ground movement[J].Earthquake Engineering and Structural Dynamics,1988,16:583-596.
[19]LINJ H,WILLIAMS F W,ZHANG WS.Anewap-proach to multi-excitation stochastic seismic response[J].Micro Computers in Civil Engineering,1993,8(4):283-290.
[20]李杰,李国强.地震工程学导论[M].北京:地震出版社,1994.
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