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LIU Yong-jian, JIANG Lei, XIONG Zhi-hua, ZHANG Guo-jing, Amir FAM. Hot spot SCF computation method of concrete-filled and PBL-stiffened rectangular hollow section joint subjected to axial tensions[J]. Journal of Traffic and Transportation Engineering, 2017, 17(5): 1-15.
Citation: LIU Yong-jian, JIANG Lei, XIONG Zhi-hua, ZHANG Guo-jing, Amir FAM. Hot spot SCF computation method of concrete-filled and PBL-stiffened rectangular hollow section joint subjected to axial tensions[J]. Journal of Traffic and Transportation Engineering, 2017, 17(5): 1-15.
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Hot spot SCF computation method of concrete-filled and PBL-stiffened rectangular hollow section joint subjected to axial tensions

  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Department of Civil Engineering, Queen's University, Kingston K7L 3N6, Ontario, Canada

  • 3.

    College of Civil Engineering, Tongji University, Shanghai 200092, China

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  • Author Bio:

    LIU Yong-jian(1966-), male, professor, PhD, lyj.lyj.chd@gmail.com

  • Received Date: 2017-08-12
  • Publish Date: 2017-10-25
    Abstract
  • The width ratio and thickness ratio of brace to chord and the width-to-thickness ratio of chord for concrete-filled and PBL-stiffened rectangular hollow section joint subjected to axial tensions were considered, and the finite element model of hot spot stress concentration factor (SCF) was established.The computation result of hot spot SCF was fitted by the least square method, the SCF computation formulas under different geometric parameters were proposed, andthe hot spot SCFs and load ranges of rectangular hollow section joint and concrete-filled rectangular hollow section joint stiffened with PBLs were compared by using the proposed formulas.Computation result shows that the SCF curve calculated by using the finite element model is almost consistent with the experiment curve obtained by the static test, and the average ratios of finite element calculation results to CIDECT calculation results are 1.006, 1.007, 1.013, 1.015 and 0.987 at the hot spots at the joint of brace and chord, respectively, and the differences are less than 15%, which verifies the reliability of finite element model.The SCFs of concrete-filled and PBL-stiffened rectangular hollow section joint subjected to axial tensions have the similar variation trend and change in parabola shape with the width ratio of brace to chord.The maximum value of SCF appears when the width of brace to chord is between 0.6 and 0.8, and increases when the width-to-thickness ratio of chord and the thickness ratio of brace to chord increase, which is same with the SCF of rectangular hollow section joint calculated by CIDECT.The computation formulas and finite element model of hot spot SCF of concrete-filled and PBLstiffened rectangular hollow section joint subjected to axial tensions are compared, the SCF average ratio is 1.011, the mean variance is 0.222, and the variation coefficient is 0.219, which proves that the fitting formulas are accurate and reliable.Concrete-filled and PBL-stiffened rectangular hollow section joint is compared with rectangular hollow section joint, the SCFs of brace and chord computed by using the proposed formulas decrease by more than 68% and 61%, respectively, and the allowable load ranges increase to more than three times under the action of 2.0×106 cycle times.

     

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