索穹顶结构动力特性及多维多点抗震性能研究
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摘要
为了弥补索穹顶这种新型大跨空间结构在动力方面研究的不足,通过对120m跨度的肋环形索穹顶结构进行模态分析,得到了不同的参数对索穹顶结构的自振频率影响曲线;通过对其进行时程分析,发现了地震动的行波效应对结构的节点位移和杆件内力的影响规律,以及考虑多维地震与仅考虑地震单向输入之间的差别,为大跨空间结构的抗震设计提供了重要参考.研究表明,多点输入对于行波方向的位移影响显著,同时,对单元内力产生不利影响,因此,大跨度空间结构抗震分析中考虑行波效应与多维地震输入是必要的.
Filling the blank in dynamic research on cable dome is a new kind of large-span space structure, whose 120()m()span cable dome was analyzed and the affection curve of cable dome frequency vs different (parameters) was obtained. Based on the time history analysis of the cable dome, the traveling-wave effect on the structure's nodal displacements and post's inner forces were found, and the difference between multi-dimensional seismic excitations and one-dimensional seismic excitation was obtained, which provided the important reference for anti-seismic design of large span space structures. The research indicates that the effect of the multi-dimensional seismic excitations to the displacement of the traveling-wave direction is (obvious) and that the effect to the element force is also negative, so it is necessary to consider the seismic traveling wave effect the and multi-dimensional seismic excitations in the anti-seismic analysis of large span space structures.
Filling the blank in dynamic research on cable dome is a new kind of large-span space structure, whose 120()m()span cable dome was analyzed and the affection curve of cable dome frequency vs different (parameters) was obtained. Based on the time history analysis of the cable dome, the traveling-wave effect on the structure's nodal displacements and post's inner forces were found, and the difference between multi-dimensional seismic excitations and one-dimensional seismic excitation was obtained, which provided the important reference for anti-seismic design of large span space structures. The research indicates that the effect of the multi-dimensional seismic excitations to the displacement of the traveling-wave direction is (obvious) and that the effect to the element force is also negative, so it is necessary to consider the seismic traveling wave effect the and multi-dimensional seismic excitations in the anti-seismic analysis of large span space structures.
引文
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[2]李芳,王国砚,茆会勇,等.考虑索穹顶结构构形变化的空气动力失稳分析[J].同济大学学报,2002,30(5):609613.LIFang,WANGGuo yan,MAOHui yong,etal.Researchonaerodynamicinstabilityofcable domestructureconsideringtransformationofstructure[J].JournalofTongjiUniversity,2002,30(5):609613.
[3]罗尧治,沈雁彬.索穹顶结构初始状态确定与成形过程分析[J].浙江大学学报:工学版,2004,38(10):13211327.LUOYao zhi,SHENYan bin.Initialconfigurationdeterminationofcabledomestructureandanalysisofit'sconfigurationprocess[J].JournalofZhejiangUniversity:EngineeringScience,2004,38(10):13211327.
[4]项海帆.斜拉桥在行波作用下的地震反应分析[J].同济大学学报,1983,11(2):19.XIANGHai fan.Seismicresponseofcable stayedbridgeunderseismictraveling waves[J].JournalofTongjiUniversity,1983,11(2):19.
[5]王前信,伍国,李云林.拱式结构对地震多支点输入反应[J].地震工程与工程振动,1984,4(2):4981.WANGQian xin,WUGuo zhou,LIYun lin.Seismicresponseofarchstructureundermultipleinputs[J].EarthquakeEngineering＆EngineeringVibration,1984,4(2):4981.
[6]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征[J].计算力学学报,2001,18(3):358363.FANLi chu,WANGJun jie,CHENWei.Responsecharacteristicsoflong spancable stayedbridgesundernon uniformseismicaction[J].ChineseJournalofComputationalMechanics,2001,18(3):358363.
[7]许金华,王向坚.大跨度拱桥在地震行波作用下的响应[J].重庆交通学院学报,1998,17(2):110.XUJin hua,WANGXiang jian.Travelingwaveseismicresponseoflong spanarchbridges[J].JournalofChongqingJiaotongInstitute,1998,17(2):110.
[8]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):7176.DINGYang,WANGBo.Seismicresponseoflongspanspatiallatticestructureconsideringtravelingwaveeffects[J].EarthquakeEngineering＆EngineeringVibration,2002,22(5):7176.
[9]罗尧治,陈晓光,沈雁彬,胡宁.网壳结构"折叠展开式"提升过程中动力响应分析[J].浙江大学学报:工学版,2003,37(6):639645.LUOYao zhi,CHENXiao guang,SHENYan bin,HUNing.Dynamicresponseanalysisofdeployableliftingconstructionprocessofreticulatedshellstructures[J].JournalofZhejiangUniversity:EngineeringSciense,2003,37(6):639645.
[10]郭继武.建筑抗震设计[M].高等教育出版社,1990:13.
[11]赵灿辉,高艳梅.大跨度拱桥地震反应分析研究现状及进展[J].重庆交通学院学报,2002,21(1):15.ZHAOCan hui,GAOYan mei.Currentsituationanddevelopmentofstudyonseismicperformanceoflongspanarchbridge[J].JournalofChongqingJiaotongInstitute,2002,21(1):15.
[12]李国豪.工程结构抗震动力学[M].上海:上海科学技术出版社,1980.242244.
[13]胡聿贤.地震工程学[M].北京:地震出版社,1988:287290.
[14]李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998:24.
[15]罗尧治.索杆张力结构的数值分析理论研究[D].杭州:浙江大学,2000:1318.LUOYao zhi.Numericalanalysistheoryforcable struttensilestructures[D].Hangzhou:ZhejiangUniversity,2000:1318.
[16]罗尧治.索杆张力结构的几何稳定性分析[J].浙江大学学报:理学版,2000,27(6):608611.LUOYao zhi.Geometricalstabilityanalysisofcablestruttensilestructures[J].JournalofZhejiangUniversity:ScienceEdition,2000,27(6):608611.
[17]罗尧治,董石麟.索杆张力结构初始预应力分布计算[J].建筑结构学报,2000,21(5):5964.LUOYao zhi,DONGShi lin.Calculatingofinitialprestressforcable struttensilestructures[J].JournalofBuildingStructures,2000:21(5):5964.
[18]张其林.索和膜结构[M].上海:同济大学出版社.2002:1517.
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