随机波浪力下超大型钢吊箱围堰动力响应分析
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摘要
为了研究超大型深水钢吊箱围堰在随机波浪力作用下的动力响应,以苏通大桥5#钢吊箱为工程背景,建立了对应的整体有限元模型.基于文氏谱以及线性谐波叠加法完成了波浪频谱与波浪时程的转换,进而得到了钢吊箱在频域与时域内的动力响应,并与特征波法和规范静力法进行了对比.结果表明,钢吊箱基频高,整体刚度较大;考虑附连水质量的影响,钢吊箱的自振频率急速下降,更接近波浪力谱峰值频率,增大了共振的可能性,动力分析时必须考虑附连水质量的影响;波浪荷载作用下,钢吊箱的动力效应普遍增大,但幅度增大较小.实际工程中,应在静力计算结果的基础上乘以1.15的放大系数,或者直接采用特征波法进行计算.
In order to investigate the dynamic response of ultra-large deep-water steel suspension box cofferdam(SSBC) with the action of random wave force,a corresponding global finite element model was established with taking the No.5 steel suspension box of Sutong Yangtze river bridge as the engineering background.Meanwhile,the transformation between wave frequency-spectrum and wave time-history was completed based on both Wen's wave spectrum and linear harmonic wave superposition method.The dynamic response of the steel suspension box in both time domain and frequency domain was obtained,and then compared with that attained by characteristic wave and standard static force methods.The results show that if the fundamental frequency of the steel suspension box is high,the global stiffness is larger.With considering the effect of the added water mass,the natural vibration frequency of the steel suspension box sharply decreases,and is closer to the peak frequency of wave force spectrum,which increases the possibility of resonance.Thus,the influence of the added water mass must be considered in dynamic analysis.With the action of wave load,the dynamic effect of the steel suspension box generally increases,but the increasing magnitude is relatively smaller.In the actual projects,it is suggested that a magnification coefficient of 1.15 should be multiplied on the basis of calculation results of static force,or the characteristic wave method should be directly used to carry out the calculation.
In order to investigate the dynamic response of ultra-large deep-water steel suspension box cofferdam(SSBC) with the action of random wave force,a corresponding global finite element model was established with taking the No.5 steel suspension box of Sutong Yangtze river bridge as the engineering background.Meanwhile,the transformation between wave frequency-spectrum and wave time-history was completed based on both Wen's wave spectrum and linear harmonic wave superposition method.The dynamic response of the steel suspension box in both time domain and frequency domain was obtained,and then compared with that attained by characteristic wave and standard static force methods.The results show that if the fundamental frequency of the steel suspension box is high,the global stiffness is larger.With considering the effect of the added water mass,the natural vibration frequency of the steel suspension box sharply decreases,and is closer to the peak frequency of wave force spectrum,which increases the possibility of resonance.Thus,the influence of the added water mass must be considered in dynamic analysis.With the action of wave load,the dynamic effect of the steel suspension box generally increases,but the increasing magnitude is relatively smaller.In the actual projects,it is suggested that a magnification coefficient of 1.15 should be multiplied on the basis of calculation results of static force,or the characteristic wave method should be directly used to carry out the calculation.
引文
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[14]王云天,伊辉延.东、黄海波浪的统计特征及谱分析[J].大连水产学院学报,1997,12(3):33-39.(WANG Yun-tian,YI Hui-yan.Statistics characteris-tics and spectrum analysis of w aves in east China sea[J].Journal of Dalian Fisheries University,1997,12(3):33-39.)
[15]中华人民共和国交通部.JTJ/T234-2001波浪模型试验规程[S].北京:人民交通出版社,2001.(Ministry of Communications of the People’s Repub-lic of China.JTJ/T 234-2001 Wave model test regula-tion[S].Beijing:China Communications Press,2001.)
[16]竺艳蓉.海洋工程波浪力学[M].天津:天津大学出版社,1991.(ZHU Yan-rong.Wave mechanics for ocean enginee-ring[M].Tianjin:Tianjin University Press,1991.)
[17]赖伟.地震和波浪作用下深水桥梁的动力响应研究[D].上海:同济大学,2004.(LAI Wei.Study on dynamic response of deep-waterbridges under earthquake and w ave[D].Shanghai:Tongji University,2004.)
[2]Crawford R J,Byfield M P.A numerical model forpredicting the bending strength of Larssen steel sheetpiles[J].Journal of Constructional Steel Research,2002,58(10):1361-1374.
[3]Wissmann K J,George M F,Mosher R L,et al.Sheetpile tensions in cellular structures[J].Journal ofGeotechnical and Geoenvironmental Engineering,2003,129(3):224-233.
[4]史柏生.广州官洲河特大桥高桩承台钢吊箱设计与施工[J].桥梁建设,2005(2):41-43.(SHI Bai-sheng.Design and construction of steelboxed cofferdam for elevated pile cap of Guanzhouriver bridge in Guangzhou[J].Bridge Construction,2005(2):41-43.)
[5]郭征红,徐伟.深水群桩基础的关键施工技术研究[J].结构工程师,2007,23(6):70-73.(GUO Zheng-hong,XU Wei.Research on key con-struction techniques for pile group foundations in deepw ater[J].Structural Engineers,2007,23(6):70-73.)
[6]徐伟,宋灿,骆艳斌,等.深水高桩承台钢吊箱在风荷载作用下的动力性能分析[J].工业建筑,2007,37(7):82-84.(XU Wei,SONG Can,LUO Yan-bin,et al.Analysisof dynamic property of elevated pile foundation steelsuspending cofferdam in deep w ater under w ind load[J].Industrial Construction,2007,37(7):82-84.)
[7]谢小松,徐伟,宋灿,等.深水高桩承台哑铃状钢吊箱在地震作用下的响应分析[J].结构工程师,2005,21(6):43-45.(XIE Xiao-song,XU Wei,SONG Can,et al.Responseanalysis of elevated pile foundation dumbbell-shapesteel suspending cofferdam in deep w ater under seis-mic action[J].Structural Engineers,2005,21(6):43-45.)
[8]Yamada Y,Iemura H,Kawano K,et al.Seismic re-sponse of offshore structure in random seas[J].Earthquake Engineering&Structural Dynamics,1989,18(7):965-981.
[9]翁长俭,张保玉.船体振动学[M].北京:人民交通出版社,1985.(WENG Chang-jian,ZHANG Bao-yu.Ship vibration[M].Beijing:China Communications Press,1985.)
[10]中华人民共和国建设部.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.(Ministry of Construction of the People’s Republic ofChina.JGJ3-2002 Technical specification for concretestructures of tall building[S].Beijing:China Ar-chitechture&Building Press,2002.)
[11]孙广俊,李爱群.关于结构振型参与系数和振型贡献的分析[J].防灾减灾工程学报,2009,29(5):485-490.(SUN Guang-jun,LI Ai-qun.Analysis of mode parti-cipation factor and model contribution of structures[J].Journal of Disaster Prevention and Mitigation En-gineering,2009,29(5):485-490.)
[12]中华人民共和国交通部.JTJ213-98海港水文规范[S].北京:人民交通出版社,1998.(Ministry of Communications of the People’s Repub-lic of China.JTJ213-98 Code of hydrology for sea har-bour[S].Beijing:China Communications Press,1998.)
[13]廖康明,吴秀杰,林雨良,等.泉州湾海域海浪谱[J].台湾海峡,1998,17(3):282-288.(LIAO Kang-ming,WU Xiu-jie,LIN Yu-liang,et al.Wave spectrum of Quanzhou bay[J].Journal of Oce-anography in Taiw an Strait,1998,17(3):282-288.)
[14]王云天,伊辉延.东、黄海波浪的统计特征及谱分析[J].大连水产学院学报,1997,12(3):33-39.(WANG Yun-tian,YI Hui-yan.Statistics characteris-tics and spectrum analysis of w aves in east China sea[J].Journal of Dalian Fisheries University,1997,12(3):33-39.)
[15]中华人民共和国交通部.JTJ/T234-2001波浪模型试验规程[S].北京:人民交通出版社,2001.(Ministry of Communications of the People’s Repub-lic of China.JTJ/T 234-2001 Wave model test regula-tion[S].Beijing:China Communications Press,2001.)
[16]竺艳蓉.海洋工程波浪力学[M].天津:天津大学出版社,1991.(ZHU Yan-rong.Wave mechanics for ocean enginee-ring[M].Tianjin:Tianjin University Press,1991.)
[17]赖伟.地震和波浪作用下深水桥梁的动力响应研究[D].上海:同济大学,2004.(LAI Wei.Study on dynamic response of deep-waterbridges under earthquake and w ave[D].Shanghai:Tongji University,2004.)
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