钢管腹杆-混凝土K形组合节点试验及仿真分析
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摘要
为研究钢桁腹-混凝土组合梁中钢管腹杆与混凝土弦杆K形组合节点的传剪机理,开展K形节点区抗剪试验及节点区键销钢筋、连接螺栓的直剪试验,得到K形节点区的破坏形态,并通过试验提出的钢筋及螺栓直剪的多折线荷载~位移本构模型,进行K形节点区的精细化三维非线性仿真分析。研究结果表明,K形节点区的竖向剪力来自于相邻节间弦杆的轴力差,键销钢筋及连接螺栓的直剪破坏是节点区受剪失效的主要原因,其抗剪承载力主要由键销钢筋及连接螺栓提供;所建立的K形节点区非线性仿真模型能够较好地反映节点区的破坏形态,极限承载力及荷载~位移曲线与试验结果吻合良好。
To study the shear transfer mechanism of the K-shape composite joint of the steel tube web members and reinforced concrete(RC)chord in the steel truss web and concrete slab composite girder,the shear test of the K-shape composite joint area and the direct shear test of the pin coupling reinforcement and connecting bolts in the area were carried out and the failure modes of the area were obtained.Based on the tests,the multi-linear load~displacement constitutive models for the direct shear of the reinforcement and connecting bolts were proposed and the refined three-dimensional nonlinear simulation analysis of the area was conducted.The results of the tests and analysis demonstrate that the vertical shear of the K-shape composite joint area originates from the axial force differences of the chords of the adjacent truss panels.The direct shear failure of the pin coupling reinforcement and connecting bolts is the major cause leading to the shear failure of the area and the shear capacity of the area is provided mainly by the reinforcement and connecting bolts.The nonlinear simulation models for the area established in this paper can well reflect the failure modes of the area and the ultimate bearing capacity and the load~displacement curves are in good agreement with those of the tests.
To study the shear transfer mechanism of the K-shape composite joint of the steel tube web members and reinforced concrete(RC)chord in the steel truss web and concrete slab composite girder,the shear test of the K-shape composite joint area and the direct shear test of the pin coupling reinforcement and connecting bolts in the area were carried out and the failure modes of the area were obtained.Based on the tests,the multi-linear load~displacement constitutive models for the direct shear of the reinforcement and connecting bolts were proposed and the refined three-dimensional nonlinear simulation analysis of the area was conducted.The results of the tests and analysis demonstrate that the vertical shear of the K-shape composite joint area originates from the axial force differences of the chords of the adjacent truss panels.The direct shear failure of the pin coupling reinforcement and connecting bolts is the major cause leading to the shear failure of the area and the shear capacity of the area is provided mainly by the reinforcement and connecting bolts.The nonlinear simulation models for the area established in this paper can well reflect the failure modes of the area and the ultimate bearing capacity and the load~displacement curves are in good agreement with those of the tests.
引文
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[8]王海波,李一竹,尹国安,等.耳板式组合桁架节点试验及有限元分析[J].土木工程学报,2016,46(7):68-73.(WANG Hai-bo,LI Yi-zhu,YIN Guo-an,et al.Experiment and Finite Element Analysis on Steel-Concrete Composite Truss Joints with Ear Plates[J].China Civil Engineering Journal,2016,46(7):68-73.in Chinese)
[9]刘朵,张建东,阎卫国.南京绕越公路江山桥的设计与施工[J].公路,2013,58(12):80-83.(LIU Duo,ZHANG Jian-dong,YAN Wei-guo.Design and Construction of Jiangshan Bridge on Nanjing Orbital Highway[J].Highway,2013,58(12):80-83.in Chinese)
[10]GB 50010-2010,混凝土结构设计规范[S].(GB 50010-2010,Code for Design of Concrete Structures[S].)
[2]陈一馨,吕彭民,宋绪丁,等.钢-混组合梁剪力钉抗剪性能试验研究[J].桥梁建设,2012,42(3):63-69.(CHEN Yi-xin,LYU Peng-min,SONG Xu-ding,et al.Test Study of Shear Performance of Shear Studs for Steel-Concrete Composite Beams[J].Bridge Construction,2012,42(3):63-69.in Chinese)
[3]李成君,周志祥,苏慈,等.预制装配式组合剪力钉试验研究[J].桥梁建设,2015,45(5):60-65.(LI Cheng-jun,ZHOU Zhi-xiang,SU Ci,et al.Experimental Study of Prefabricated Composite Shear Studs[J].Bridge Construction,2015,45(5):60-65.in Chinese)
[4]Machacek Josef,Charvat Martin.Study on Shear Connection of Bridge Steel Truss and Concrete Slab Deck[J].Journal of Civil Engineering and Management,2017,23(1):105-112.
[5]陈宝春,牟廷敏,陈宜言,等.我国钢-混凝土组合结构桥梁研究进展及工程应用[J].建筑结构学报,2013,34(S1):1-10.(CHEN Bao-chun,MOU Ting-min,CHEN Yi-yan,et al.State-of-the-Art of Research and Engineering Application of Steel-Concrete Composite Bridges in China[J].Journal of Building Structures,2013,34(S1):1-10.in Chinese)
[6]野村敏雄,大野了,加藤敏明.PC複合トラス橋格点部の構造特性に関する研究[J].大林組技術研究所報,2004(68):1-6.(Toshio Nomura,Satoru Ohno,Toshiaki Kato.A Study on Structural Performance of Joint in PC Hybrid Truss Bridge[J].Obayashi Corporate Report,2004(68):1-6.in Japanese)
[7]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):2 762-2 767.(ZHOU Ling-yu,WANG Hai-bo,HE Gui-chao.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):2 762-2 767.in Chinese)
[8]王海波,李一竹,尹国安,等.耳板式组合桁架节点试验及有限元分析[J].土木工程学报,2016,46(7):68-73.(WANG Hai-bo,LI Yi-zhu,YIN Guo-an,et al.Experiment and Finite Element Analysis on Steel-Concrete Composite Truss Joints with Ear Plates[J].China Civil Engineering Journal,2016,46(7):68-73.in Chinese)
[9]刘朵,张建东,阎卫国.南京绕越公路江山桥的设计与施工[J].公路,2013,58(12):80-83.(LIU Duo,ZHANG Jian-dong,YAN Wei-guo.Design and Construction of Jiangshan Bridge on Nanjing Orbital Highway[J].Highway,2013,58(12):80-83.in Chinese)
[10]GB 50010-2010,混凝土结构设计规范[S].(GB 50010-2010,Code for Design of Concrete Structures[S].)