大跨度钢桁拱桥关键节点受力特性及优化研究
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摘要
横琴二桥是国内跨度最大、桥面最宽的公路钢桁架拱桥,孔跨布置为:100+400+100=600 m。桥下拱肋与下弦杆交汇处的节点(E9节点)采用焊接整体节点,节点板将主桁相关杆件和桥面纵、横梁连成一体,各构件内部加劲肋众多,形式、尺寸多样,节点的结构构造和受力状态复杂。在全桥空间有限元分析的基础上,选取具有代表性的E9节点和2个最不利的主力组合工况,完成局部精细有限元分析。研究结果表明:2个工况下E9节点各相关杆件绝大部分区域应力水平较低,Mises等效应力小于200 MPa,局部区域应力集中程度较严重,应力水平超出了弹性范围。针对拱内下弦杆变截面处出现的高应力区域的情况提出改善措施,建议在该位置增设一道环形横隔板,该方案可不影响下弦杆内的柔性系杆通过。增设横隔板后,变截面处的应力集中现象得到明显改善,应力水平在弹性范围以内。
Hengqin second bridge is a highway steel truss arch bridge with the largest span and the widest deck in China. The span of the bridge is 100+400+100=600 m. The welded integral joint E9 was located at the junction of the lower arch rib and the lower chord. By using two connecting plates, the relevant truss bars and cross beam of the floor beam are welded as a whole. The internal structure construction of the joint is very complex. Many stiffening ribs of various kinds and scale are arranged inside every components. Refined finite element analysis is completed for the representative E9 joint and the two worst load cases of main loads combination based on 3 D finite element analysis of the whole bridge. The results show that the stress level of most areas of the relevant components of E9 joint are not high, and their Mises equivalent stress is less than 200 MPa. However, 5 small regions exist where bear severe stress concentration are beyond yield stress. A circinate diaphragm is proposed to reduce the stress level of the varying section of the lower chord. This measure does not affect the work of flexible tied bars. The results of local refined finite element analysis show that stress concentration is solved and the material remains in the elastic state with diaphragm added.
Hengqin second bridge is a highway steel truss arch bridge with the largest span and the widest deck in China. The span of the bridge is 100+400+100=600 m. The welded integral joint E9 was located at the junction of the lower arch rib and the lower chord. By using two connecting plates, the relevant truss bars and cross beam of the floor beam are welded as a whole. The internal structure construction of the joint is very complex. Many stiffening ribs of various kinds and scale are arranged inside every components. Refined finite element analysis is completed for the representative E9 joint and the two worst load cases of main loads combination based on 3 D finite element analysis of the whole bridge. The results show that the stress level of most areas of the relevant components of E9 joint are not high, and their Mises equivalent stress is less than 200 MPa. However, 5 small regions exist where bear severe stress concentration are beyond yield stress. A circinate diaphragm is proposed to reduce the stress level of the varying section of the lower chord. This measure does not affect the work of flexible tied bars. The results of local refined finite element analysis show that stress concentration is solved and the material remains in the elastic state with diaphragm added.
引文
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[15]林梦凯,冀伟,李海莲,等.波形钢腹板工字型钢梁的手风琴效应研究[J].铁道科学与工程学报,2016,13(2):283-288.LIN Mengkai,JI Wei,LI Hailian,et al.Study on accordion effect of corrugated steel webs i-shaped steel girde[J].Journal of Railway Science and Engineering,2016,13(2):283-288.
[2]黄永辉,王荣辉,甘泉.钢桁梁桥整体节点焊接残余应力试验[J].中国公路学报,2011,24(1):83-88.HUANG Yonghui,WANG Ronghui,GAN Quan.Experiment on welding residual stress of integral joint for steel truss bridge[J].China Journal of Highway and Transport,2011,24(1):83-88.
[3]张依如,卫军,刘晓春,等.钢箱-桁架梁K型整体节点焊接残余应力的有限元分析[J].铁道科学与工程学报,2016,13(2):289-294.ZHANG Yiru,WEI Jun,LIU Xiaochun,et al.Finite element analysis on welding residual stresses of integral K-joints for steel box-truss bridge[J].Journal of Railway Science and Engineering,2016,13(2):289-294.
[4]王天亮,王邦楣,潘东发.芜湖长江大桥钢梁整体节点疲劳试验研究[J].中国铁道科学,2001,22(5):96-100.WANG Tianliang,WANG Bangmei,PAN Dongfa.Steel beam integral node fatigue test of Wuhu Yangtze River Bridge[J].China Railway Science,2001,22(5):96-100.
[5]郭红艳,江恒心,魏振鑫.南京大胜关长江大桥钢梁焊接难点解析[J].电焊机,2013,43(11):14-18.GUO Hongyan,JIANG Hengxin,WEI Zhenxin.Difficulties analysis of steel beam welding on Nanjing Dashengguan Yangtze River Bridge[J].Electric Welding Machine,2013,43(11):14-18.
[6]王福春,梁力,李艳凤.下承式系杆拱桥拱脚局部应力有限元分析[J].沈阳建筑大学学报(自然科学版),2011,27(2):281-285.WANG Fuchun,LIANG Li,LI Yanfeng.Finite element analysis of local stress at arch spring of through-type tied arch bridge[J].Journal of Shenyang Jianzhu University(Natural Science),2011,27(2):281-285.
[7]钟炜辉,孟宝,郝际平,等.冷弯薄壁构件腹板局部受压承载力分析及设计建议[J].建筑结构,2015,45(5):86-90.ZHONG Weihui,MENG Bao,HAO Jiping,et al.Local bearing capacity analysis for the web of cold-formed thin-wall member and design recommendation[J].Building Structure,2015,45(5):86-90.
[8]王秋维,张月坤,张海镇.型钢混凝土空间中节点受力性能有限元分析[J].西安建筑科技大学学报(自然科学版),2016,48(6):853-861.WANG Qiuwei,ZHANG Yuekun,ZHANG Haizhen.Finite element analysis on mechanical behavior of SRC spacial interior joints[J].Journal of Xi’an University of Architecture&Technology(Natural Science Edition),2016,48(6):853-861.
[9]周凌宇,贺桂超.大跨度钢-混凝土组合桁架铁路桥端节点模型试验研究[J].土木工程学报,2012,45(1):92-99.ZHOU Lingyu,HE Guichao.Model test for the end joint of long-span steel-concrete composite truss railway bridges[J].China Civil Engineering Journal,2012,45(1):92-99.
[10]杨国涛,吴冲,苏庆田.多跨系杆拱桥组合梁剪力钉受力性能分析[J].北京工业大学学报,2011,37(12):1806-1810.YANG Guotao,WU Chong,SU Qingtian.Analysis on the shear studs in composite girders of multi-span tied arch bridge[J].Journal of Beijing University of Technology,2011,37(12):1806-1810.
[11]张晔芝,吉海燕,潘成赟.新型高铁双肋钢桁拱桥结构特点和受力性能[J].铁道科学与工程学报,2014,11(1):17-23.ZHANG Yezhi,JI Haiyan,PAN Chengyun.Research on the structure characteristic and mechanical behavior of a new type steel truss arch bridge with high speed railway[J].Journal of Railway Science and Engineering,2014,11(1):17-23.
[12]谢新,刘晓刚,李一昕,等.大跨组合桁梁桥全焊接节点局部应力有限元分析[J].工业建筑,2014,44(增):472-475,480.XIE Xin,LIU Xiaogang,LI Yixin,et al.Local stress finite element analysis of all-welded joint in long-span composite truss girder bridge[J].Industrial Construction,2014,44(Suppl):472-475,480.
[13]陈刘明,唐冕,张凡.双层景观钢桁梁桥整体节点受力性能分析[J].铁道科学与工程学报,2016,13(3):480-487.CHEN Liuming,TANG Mian,ZHANG Fan.Analysis on integral joint’s force performance of double-layer landscape steel truss bridge[J].Journal of Railway Science and Engineering,2016,13(3):480-487.
[14]王海良,曹磊,李自林.拱肋截面变化对刚性系杆拱桥受力性能影响分析[J].河北工业大学学报,2011,40(3):115-118.WANG Hailiang,CAO Lei,LI Zilin.Infulence of mechanical behavior of variational arch rib section on rigid tied arch bridge analysis[J].Journal of Hebei University of Technology,2011,40(3):115-118.
[15]林梦凯,冀伟,李海莲,等.波形钢腹板工字型钢梁的手风琴效应研究[J].铁道科学与工程学报,2016,13(2):283-288.LIN Mengkai,JI Wei,LI Hailian,et al.Study on accordion effect of corrugated steel webs i-shaped steel girde[J].Journal of Railway Science and Engineering,2016,13(2):283-288.