Volume 24 Issue 6
Dec.  2024
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2024  >  24(6): 106-120
LIU Jun-ping, YANG Qian, LIU Hua-long, YANG Yi-tu, CHEN Bao-chun. Stress concentration characteristics of concrete-filled steel tubular truss-rib K-joint with inner studs[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 106-120. doi: 10.19818/j.cnki.1671-1637.2024.06.007
Citation: LIU Jun-ping, YANG Qian, LIU Hua-long, YANG Yi-tu, CHEN Bao-chun. Stress concentration characteristics of concrete-filled steel tubular truss-rib K-joint with inner studs[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 106-120. doi: 10.19818/j.cnki.1671-1637.2024.06.007
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Stress concentration characteristics of concrete-filled steel tubular truss-rib K-joint with inner studs

doi: 10.19818/j.cnki.1671-1637.2024.06.007
  • 1.

    College of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China

  • 2.

    CCCC second Harbor Engineering Co., Ltd., Wuhan 430014, Hubei, China

Funds:

National Natural Science Foundation of China 52078136

More Information
  • Author Bio:

    LIU Jun-ping(1977-), male, professor, PhD, liujunping@fzu.edu.cn

  • Received Date: 2024-06-19
  • Publish Date: 2024-12-25
    Abstract
  • To further study the influence of setting inner studs on the stress distribution of concrete-filled steel tubular truss-rib K-joints, a test on the stress concentration characteristics was conducted. The hot spot stress and stress concentration factor of joints without inner studs were compared and tested. The fine finite element models of the joints with inner studs were established. The influences of the arrangement and geometric dimensions of inner studs on the stress concentration factor were analyzed. Based on the results of the test and the finite element parameter analysis, the recommended layout of the inner stud and the calculation method of the stress concentration factor of the joints were proposed. Research results show that the hot spot stress distribution of the joints is not changed with the inner studs, and the maximum stress concentration factor is found at the crown point of the main tube in the tensile weld area, but the stress concentration degree of the joints effectively reduces. Compared with the joint without inner studs, the maximum hot spot stress of the joint with inner studs reduces by 17.38%. The overall stress concentration factors of the main tube side and the corresponding branch tube side in the tensile weld area decrease by 24.20% and 12.30% on average, respectively, and the circumferential section stress of the main tube decreases by 16.2%. The influence of inner studs on the stress distribution and stress concentration in the compressive weld area is so slight to be within 7%. The stress concentration factors are affected greatly by the circumferential arrangement angle and the axial arrangement spacing of inner studs but less by the geometrical dimension of inner studs. The inner studs are suggested to be arranged within the range of approximately 2.7 times the diameter of the branch tube from the center of the joint to each side section in the axial direction of the main tube. The circumferential arrangement is within the range of [-60°, 60°] of the central angle of connecting branch tube side. At the same time, the interval between adjacent studs should not be less than 6 times the diameter of the inner stud but not more than 400 mm. The calculation formula of the stress concentration factor introduced by the influence coefficient of axial arrangement and circumferential arrangement of inner studs can be used in evaluating the fatigue performance of concrete-filled steel tubular truss-rib K-joints with inner studs with high calculation accuracy.

     

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