外接式钢桁-槽型梁组合桁架节点模型试验研究
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摘要
为研究外接式钢桁-槽型梁组合桁架节点的受力性能、破坏模式以及极限承载力,对缩尺比例为1∶3的节点模型进行单调水平静力加载实验。介绍节点的模型设计、加载过程和测点布置情况;利用混凝土上弦杆自由端中点测得的位移绘出荷载-位移曲线得出外接式节点的极限承载力;同时对比各部件有限元分析结果,找出节点试验的薄弱部分,并提出相应的改进意见。研究结果表明:节点承载力较高,PBL剪力键传力效果明显;在不改变原缩尺比例的情况下通过在钢腹杆内增加12 mm厚的加劲肋能有效提高腹杆稳定性与节点极限承载力。研究成果可为以后实际工程设计以及理论研究提供帮助。
To research the mechanical behavior,failure mode and ultimate bearing capacity of steel truss- trough girder composite truss joints,the monotonous static horizontal load was applied to the model gradually whose reduced- scale was 1 ∶ 3. The design of model,loading process and arrangements of measuring points were described in the first part of the thesis. The ultimate bearing capacity of the external node was calculated by analyzing the load- displacement curve of the free terminal of the concrete chord midpoint obtained by the measured displacement. Simultaneously,the aim is to find out the weak part of the node by contrasting the results obtained from the finite element analysis and propose appropriate improvements. The results indicate that the bearing capacity of node can meet the requirement of bearing capacity,and the PBL connector holds a good capability to transmit force. When the reduced- scale remains unchanged,adding a 12- millimeter- thick stiffener can effectively improve the stability of the belly bar and the ultimate bearing capacity of the node. The research results can provide help for the later theoretical research and practical engineering design.
To research the mechanical behavior,failure mode and ultimate bearing capacity of steel truss- trough girder composite truss joints,the monotonous static horizontal load was applied to the model gradually whose reduced- scale was 1 ∶ 3. The design of model,loading process and arrangements of measuring points were described in the first part of the thesis. The ultimate bearing capacity of the external node was calculated by analyzing the load- displacement curve of the free terminal of the concrete chord midpoint obtained by the measured displacement. Simultaneously,the aim is to find out the weak part of the node by contrasting the results obtained from the finite element analysis and propose appropriate improvements. The results indicate that the bearing capacity of node can meet the requirement of bearing capacity,and the PBL connector holds a good capability to transmit force. When the reduced- scale remains unchanged,adding a 12- millimeter- thick stiffener can effectively improve the stability of the belly bar and the ultimate bearing capacity of the node. The research results can provide help for the later theoretical research and practical engineering design.
引文
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[12]樊健生,聂建国,张彦玲.钢-混凝土组合梁抗裂性能的试验研究[J].土木工程学报,2011,44(2):1-7.FAN Jiansheng,NIE Jianguo,ZHANG Yanling.Experimental study of crack resistance of steel-concrete composite beams[J].China Civil Engineering Journal,2011,44(2):1-7.
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[14]GB 50010-2002,混凝土结构设计规范[S].GB 50010-2002,Code for design of concrete structures[S].
[15]GB 50017-2003,钢结构设计规范[S].GB 50017-2003,Code for design of steel structures[S].
[2]AISI T-297,Innovations in Steel Bridge Around the World[S].
[3]王倩,刘玉擎,黄生富.桁腹式组合梁桥节点构造研究[C]//第十八届全国桥梁学术会议论文集.北京:人民交通出版社,2008:1030-1034.WANG Qian,LIU Yuqing,HUANG Shengfu.Study the construction of joint on abdominal truss of combination bridge[C]//Proceedings of Eighteenth National Conference.Beijing:China Communications Press,2008:1030-1034.
[4]陈开利.法国Boulonnais高架桥简介[J].国外桥梁,1999(1):15-17.CHEN Kaili.About boulonnais viaduct in France[J].Foreign Bridges,1999(1):15-17.
[5]Minami H,Yamamura M,Taira Y.Design of the kinokawa viaduct composite truss bridge[C]//Proceedings of the 1st Fib Congress,2003.
[6]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.
[7]周凌宇,贺桂超.不同比例外接式钢-混凝土组合桁架节点的研究[J].四川大学学报(工程科学版),2012,44(2):9-15.ZHOU Lingyu,HE Guichao.Study on steel-concrete joints with two kinds of scale[J].Journal of Sichuan University(Engineering Science Edition),2002,44(2):9-15.
[8]张花.大跨度钢-混凝土组合桁架节点刚度研究[D].长沙:中南大学,2012.ZHANG Hua.The stiffness of Steel-concrete composite truss node[D].Changsha:Central South University,2012.
[9]周凌宇,王海波,贺桂超.采用PBL连接件的组合桁架节点受力性能[J].中南大学学报(自然科学版),2012,43(7):2762-2767.ZHOU Lingyu,WANG Haibo,HE Guichao.Experiment for mechanical properties on steel-concrete composite truss joints with PBL connectors[J].Journal of Central South University(Science and Technology),2012,43(7):2762-2767.
[10]刘玉擎,曾明根,陈艾荣.连接件在桥梁结构中的应用[J].哈尔滨工业大学学报,2003,35(增刊):272-275.LIU Yuqing,ZENG Minggen,CHEN Airong.Application and research of shear connectors in bridge structures[J].Journal of Harbin Institute of Technology,2003,35(Suppl):272-275.
[11]刘玉擎.组合结构桥梁的发展与展望[C]//中国公路学会桥梁和结构工程分会2005年全国桥梁学术会议论文集.北京:人民交通出版社,2005:186-192.LIU Yuqing.The development and prospect of composite bridge[C]//China Highway Society and Structural Engineering Branch of the National Bridge Conference 2005Proceedings.Beijing:China Communications Press,2005:186-192.
[12]樊健生,聂建国,张彦玲.钢-混凝土组合梁抗裂性能的试验研究[J].土木工程学报,2011,44(2):1-7.FAN Jiansheng,NIE Jianguo,ZHANG Yanling.Experimental study of crack resistance of steel-concrete composite beams[J].China Civil Engineering Journal,2011,44(2):1-7.
[13]李国强,李现辉,张哲.腹板嵌入式钢-混凝土组合梁施工阶段受力性能研究[J].土木工程学报,2009,42(12):61-68.LI Guoqiang,LI Xianhui,ZHANG Zhe.Mechanical characteristics of steel-concrete composite beams with embedded webs during construction[J].China Civil Engineering Journal,2009,42(12):61-68.
[14]GB 50010-2002,混凝土结构设计规范[S].GB 50010-2002,Code for design of concrete structures[S].
[15]GB 50017-2003,钢结构设计规范[S].GB 50017-2003,Code for design of steel structures[S].