现役中承式悬吊桥面系拱桥静动力响应
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摘要
针对一座现役的三跨(65m+85m+65m)中承式悬吊桥面系拱桥进行静动载试验和数值分析,实测该桥拱肋、桥面、横梁、吊杆在静力荷载下的挠度、应变,分析校验系数,并测试冲击系数、吊杆张力,分析了自振特性.结果表明,静力荷载下,该桥某拱脚处抵御负弯矩刚度较差,而其他各构件的强度及刚度均满足规范要求;动载下吊杆张力测试值与计算值误差在15%以内,强度满足规范要求;实测该桥冲击系数较大,且自振特性分析表明主跨和边跨的竖弯自振频率与扭转自振频率较为接近,边跨可能存在车桥共振;车桥耦合振动特性较差,吊杆尤其是短吊杆的疲劳受力较为不利.
The static and dynamic load tests and numerical analysis were carried out on an existing three-span(65 m+85 m+65 m) half-through arch bridge with suspension deck system. In which, the deflection and strain of arch rib, bridge deck, cross beam and suspender under static load were measured, the check coefficient was analyzed, the impact coefficient and suspender tension were tested, and the natural vibration characteristics were analyzed. Results show that the certain arch foot stiffness against negative bending moments is poor under static load, while the strength and stiffness of other components meet the specification requirements. The error of suspender tension between the measured and calculated values under dynamic load is less than 15%, and the strength meets the requirements of specifications, but the measured impact coefficient is bigger. The natural vibration characteristic mode analysis indicates that the free vertical bending vibration frequency is close to the free torsional vibration frequency. Moreover, there may be a vehicle-bridge resonance on the side span of bridge. The vibration characteristics of vehicle-bridge coupling are poor which is harmful for the fatigue stress of booms, especially the short booms.
The static and dynamic load tests and numerical analysis were carried out on an existing three-span(65 m+85 m+65 m) half-through arch bridge with suspension deck system. In which, the deflection and strain of arch rib, bridge deck, cross beam and suspender under static load were measured, the check coefficient was analyzed, the impact coefficient and suspender tension were tested, and the natural vibration characteristics were analyzed. Results show that the certain arch foot stiffness against negative bending moments is poor under static load, while the strength and stiffness of other components meet the specification requirements. The error of suspender tension between the measured and calculated values under dynamic load is less than 15%, and the strength meets the requirements of specifications, but the measured impact coefficient is bigger. The natural vibration characteristic mode analysis indicates that the free vertical bending vibration frequency is close to the free torsional vibration frequency. Moreover, there may be a vehicle-bridge resonance on the side span of bridge. The vibration characteristics of vehicle-bridge coupling are poor which is harmful for the fatigue stress of booms, especially the short booms.
引文
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[18]张耀,孙增寿. 基于车桥耦合振动的钢管混凝土系杆拱桥动力响应分析[J].铁道科学与工程学报,2016,13(1):103-110.ZHANG Y,SUN Z S. Analysis of concrete-filled steel tubular tied-arch bridge under travelling vehicles[J]. Journal of Railway Science and Engineering,2016,13(1):103-110. (in Chinese)
[2] 赵虎,蒲黔辉. 吊杆拱桥考虑结构缺陷及交通量增加的受力特性[J].重庆大学学报,2014,37(6):25-32.ZHAO H,PU Q H. Mechanical characteristics of tied-arch bridge under structural defect sand traffic increase[J]. Journal of Chongqing University,2014,37(6):25-32. (in Chinese)
[3]陈天平.局部腐蚀对钢管拱肋极限承载力的影响的试验研究与有限元分析[D].广州:广州大学,2016.CHEN T P. Experimental study and finite element analysis of localized corrosion on the ultimate bearing capacity of steel arch[D].Guangzhou:Guangzhou University,2016.(in Chinese)
[4]余印根.中、下承式拱桥悬吊桥面系强健性研究[D].福州:福州大学,2015.YU Y G. Study on robustness of suspended floor system in half-through and through arch bridges[D]. Fuzhou: Fuzhou University,2015.(in Chinese)
[5]吴庆雄,余印根,陈宝春. 下承式钢管混凝土刚架系杆拱桥吊杆断裂动力分析[J].振动与冲击,2014,33(15):144-149.WU Q X,YU Y G,CHEN B C .Dynamic analysis for cable loss of a rigid-frame tied through concrete-filled steel tubular arch bridge[J]. Journal of Vibration and Shock,2014,33(15):144-149. (in Chinese)
[6]陈旭勇,汤杰,杨宏印,等.基于下承式钢管混凝土系杆拱桥冲击系数的分析[J].武汉工程大学学报,2018,40(2):197-202.CHEN X Y,TANG J,YANG H Y,et al. Impact coefficient of supported steel pipe concrete tied arch bridge[J].Journal of Wuhan Institute of Technology,2018,40(2):197-202.(in Chinese)
[7]吴昊.某中承式钢管混凝土拱桥病害分析及加固设计[J].公路工程,2017,42(3):154-158.WU H. Disease analysis and reinforcement design of a mid-supported concrete-filled steel tubular arch bridge[J]. Highway Engineering,2017,42(3):154-158.(in Chinese)
[8]陈宝春,余印根.公路与城市桥梁技术状况评估方法对比分析[J].中国公路学报,2013,26(3):94-100.CHEN B C,YU Y G. Comparative analysis of technical condition rating of highway bridges and city bridges[J].China Journal of Highway and Transport,2013,26(3):94-100.(in Chinese)
[9]付文胜,田洪松,孙仲.基于钢管混凝土拱桥检测结果的主拱肋病害评估[J].桥梁建设,2013,43(1):47-51.FU W S,TIAN H S,SUN Z. Assessment of deteriorations of main arch ribs of CFST arch bridge based on inspection results[J].Bridge Construction,2013,43(1):47-51.(in Chinese)
[10]黄永辉,刘爱荣,王荣辉.拱肋下挠对钢管混凝土拱桥极限承载力的影响[J].公路,2013,58(12):87-90.HUANG Y H,LIU A R,WANG R H. Influence of deflection of arch rib on ultimate bearing capacity of concrete filled steel tubular[J].Highway,2013,58(12):87-90.(in Chinese)
[11]滕宇.钢管混凝土拱桥检测评估与加固技术研究[D].西安:长安大学,2016.TENG Y. Detection of CFST arch bridge and reinforcing technology assessment [D].Xi’an: Chang’an University,2016.(in Chinese)
[12]卜志鹏.大跨度CFST系杆拱桥静动载试验分析研究[J].西安建筑科技大学学报(自然科学版),2015,47(3):388-391.PIAO Z P. Study on the static and dynamic load test for long-span CFST tied arch bridge[J].Journal of Xi’an University of Architecture & Technology (Natural Science Edition),2015,47(3):388-391.(in Chinese)
[13]长安大学.中华人民共和国行业推荐性标准(JTG/T J21-01-2015),公路桥梁荷载试验规程[S].北京:中华人民共和国交通部,2015.Chang’an University. Recommended standards for People’s Republic of China industry(JTG/T J21-01-2015),Test code for highway bridge load[S]. Beijing: Ministry of Communications of the People’s Republic of China,2015.(in Chinese)
[14]田志勇,唐茂林,蒲黔辉,等.宁波庆丰桥静、动载试验研究[J].桥梁建设,2012,42(5):31-36.TIAN Z Y,TANG M L,PU Q H, et al. Study of static and dynamic load tests of Qingfeng bridge in Ningbo[J].Bridge Construction,2012,42(5):31-36.(in Chinese)
[15]龚光,林友勤,宗周红,等. 武夷山市公馆大桥静载试验分析[J].福州大学学报(自然科学版),2001,29(5):81-84.GONG G,LIN Y Q,ZONG Z H,et al. Analysis of the test of the Gongguan bridge in the Wuyi Mountain City under static loads[J].Journal of Fuzhou University(Natural Science),2001,29(5):81-84. (in Chinese)
[16]蒋新亭. 国道 314 线库尔勒孔雀河大桥检测与荷载试验[J].山西建筑,2008,34(11):299-300.JIANG X T. Detection and load experiment of the Kongque River Bridge in the national highway 314 in Kuerle[J]. Shanxi Architecture,2008,34(11):299-300. (in Chinese)
[17]杨建喜,陈惟珍,古锐. 拱桥短吊杆动力特性分析[J]. 桥梁建设,2014,44(3):13-18.YANG J X,CHEN W Z,GU R. Analysis of dynamic characteristics of short hangers of arch bridge[J]. Bridge Construction,2014,44(3):13-18. (in Chinese)
[18]张耀,孙增寿. 基于车桥耦合振动的钢管混凝土系杆拱桥动力响应分析[J].铁道科学与工程学报,2016,13(1):103-110.ZHANG Y,SUN Z S. Analysis of concrete-filled steel tubular tied-arch bridge under travelling vehicles[J]. Journal of Railway Science and Engineering,2016,13(1):103-110. (in Chinese)