CFRP索斜拉试验桥动态测试与地震响应分析
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摘要
为获得碳纤维复合材料(CFRP)索斜拉试验桥的动力特性试验结果与理论值的差异,并比较CFRP索与钢索斜拉桥的动力特性和地震响应值,采用脉动法对CFRP索试验桥进行现场模态试验,联合采用峰值拾取法和互功率谱法识别模态参数,并将测试结果与有限元计算值进行对比;同时根据等轴向刚度准则进行CFRP索与钢索的替换,对不同配索模型分别进行了动力特性和地震响应分析。分析结果表明:试验桥的实测结果与计算值接近,振型吻合良好,前3阶自振频率最大差值仅为7.9%;因试验桥整体刚度大,CFRP索斜拉桥较钢索的优势仅部分体现,自振频率最大提升值为0.2%,地震作用下塔底轴力和弯矩峰值分别减小了0.11%和0.16%。
In order to obtain the differences between the testing results and the theoretical values of dynamic characteristics of the testing cable-stayed bridge with CFRP(carbon fiber reinforced plastics) cables,and to compare dynamic characteristics and seismic response values of the cable-stayed bridge with CFRP and steel cables,the pulsating method is used for the field modal test of the CFRP cable-stayed experimental bridge,and the peak picking method and cross-power spectral density method are made joint use to identify its modal parameters,then these parameters are compared with the values of calculating by finite element model.And on the basis of axial stiffness equivalent principle,the CFRP cables of the experimental bridge are replaced with steel cables.Following that,the analysis of dynamic characteristics and seismic response is adopted to the models with different cables.The conclusions show that: the measured results of the testing bridge are close to the calculated values,their mode shapes match well,the maximum difference of their former three natural frequencies is only 7.9%;due to the enormous global stiffness of the testing bridge,the advantages of the cable-stayed bridge with CFRP cables over that with steel cables are only partially embodied;the largest increase of the natural frequency is only 0.2%;under some seismic action,the axial force and the bending moment in the bottom of the tower are reduced 0.11% and 0.16%.3 tabs,9 figs,12 refs.
In order to obtain the differences between the testing results and the theoretical values of dynamic characteristics of the testing cable-stayed bridge with CFRP(carbon fiber reinforced plastics) cables,and to compare dynamic characteristics and seismic response values of the cable-stayed bridge with CFRP and steel cables,the pulsating method is used for the field modal test of the CFRP cable-stayed experimental bridge,and the peak picking method and cross-power spectral density method are made joint use to identify its modal parameters,then these parameters are compared with the values of calculating by finite element model.And on the basis of axial stiffness equivalent principle,the CFRP cables of the experimental bridge are replaced with steel cables.Following that,the analysis of dynamic characteristics and seismic response is adopted to the models with different cables.The conclusions show that: the measured results of the testing bridge are close to the calculated values,their mode shapes match well,the maximum difference of their former three natural frequencies is only 7.9%;due to the enormous global stiffness of the testing bridge,the advantages of the cable-stayed bridge with CFRP cables over that with steel cables are only partially embodied;the largest increase of the natural frequency is only 0.2%;under some seismic action,the axial force and the bending moment in the bottom of the tower are reduced 0.11% and 0.16%.3 tabs,9 figs,12 refs.
引文
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[9]吕志涛,梅葵花.国内首座CFRP索斜拉桥的研究[J].土木工程学报,2007,40(1):54-59.LU Zhi-tao,MEI Kui-hua.First application of CFRPcables for a cable-stayed bridge in China[J].ChinaCivil Engineering Journal,2007,40(1):54-59.
[10]Rizzo P,Lanzade S F.Acoustic emission monitoring ofcarbon-fiber-reinforced-polymer bridge stay cables inlarge-scale testing[J].Experimental Mechanics,2001,41(3):282-290.
[11]陈常松,田仲初,郑万泔,等.大跨度混凝土斜拉桥模态试验技术研究[J].土木工程学报,2005,38(10):72-75,101.CHEN Chang-song,TIAN Zhong-shu,ZHENG Wan-gan,et al.A study on the modal experiment techniqueof long-span cable-stayed bridges[J].China Civil En-gineering Journal,2005,38(10):72-75,101.
[12]张新军,应磊东.应用碳纤维缆索的大跨度悬索桥抗风稳定性研究[J].土木工程学报,2006,39(12):79-82,118.ZHANG Xin-jun,YING Lei-dong.Wind stability oflong-span suspension bridges using carbon fiber rein-forced polymer cables[J].China Civil EngineeringJournal,2006,39(12):79-82,118.
[2]Christoffersen J,Jensen H E,Hauge L,et al.Innova-tive cable-stayed bridge[J].Concrete,1998,32(7):32-34.
[3]Grace N F,Navarre F C,Nacey R B,et al.Design-construction of bridge street bridge:first CFRP bridge inthe United States[J].PCI Journal,2002,47(5):20-35.
[4]梅葵花,吕志涛.CFRP在超大跨悬索桥和斜拉桥中的应用前景[J].桥梁建设,2002(2):75-78.MEI Kui-hua,LU Zhi-tao.Application prospect ofCFRP to super length suspension bridge and cable-stayed bridge[J].Bridge Construction,2002(2):75-78.
[5]梅葵花,吕志涛,张继文,等.碳纤维复合材料索斜拉桥的设计与测试[J].长安大学学报:自然科学版,2007,27(6):48-52.MEI Kui-hua,LU Zhi-tao,ZHANG Ji-wen,et al.Study on the design and test of the cable-stayedbridge with CFRP cables[J].Journal of Chang anUniversity:Natural Science Edition,2007,27(6):48-52.
[6]陈凤山,赵国藩,王兆忠.CFRP加固损伤钢筋混凝土梁的性能试验[J].建筑科学与工程学报,2008,25(4):116-122.CHEN Feng-shan,ZHAO Guo-fan,WANG Zhao-zhong.Test on performance of damaged RC beamsstrengthened with CFRP[J].Jonrnal of Archiectureand Civil Engineering,2008,25(4):116-122.
[7]刘荣桂,李成绩,龚向华,等.碳纤维斜拉索的动力参数特性分析[J].哈尔滨工业大学学报,2008,40(8):1284-1288.LIU Rong-gui,LI Cheng-ji,GONG Xiang-hua,et al.Analysis of dynamic properties for CFRP stayed ca-bles[J].Journal of Harbin Institute of Technology,2008,40(8):1284-1288.
[8]梅葵花,吕志涛,孙胜江.CFRP拉索的非线性参数振动特性[J].中国公路学报,2007,20(1):52-57.MEI Kui-hua,LU Zhi-tao,SUN Sheng-jiang.Propertyof nonlinear parametric vibration of CFRP cables[J].China Journal of Highway and Transport,2004,17(2):43-45.
[9]吕志涛,梅葵花.国内首座CFRP索斜拉桥的研究[J].土木工程学报,2007,40(1):54-59.LU Zhi-tao,MEI Kui-hua.First application of CFRPcables for a cable-stayed bridge in China[J].ChinaCivil Engineering Journal,2007,40(1):54-59.
[10]Rizzo P,Lanzade S F.Acoustic emission monitoring ofcarbon-fiber-reinforced-polymer bridge stay cables inlarge-scale testing[J].Experimental Mechanics,2001,41(3):282-290.
[11]陈常松,田仲初,郑万泔,等.大跨度混凝土斜拉桥模态试验技术研究[J].土木工程学报,2005,38(10):72-75,101.CHEN Chang-song,TIAN Zhong-shu,ZHENG Wan-gan,et al.A study on the modal experiment techniqueof long-span cable-stayed bridges[J].China Civil En-gineering Journal,2005,38(10):72-75,101.
[12]张新军,应磊东.应用碳纤维缆索的大跨度悬索桥抗风稳定性研究[J].土木工程学报,2006,39(12):79-82,118.ZHANG Xin-jun,YING Lei-dong.Wind stability oflong-span suspension bridges using carbon fiber rein-forced polymer cables[J].China Civil EngineeringJournal,2006,39(12):79-82,118.
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