ZHANG Wen-jun, ZHANG Xin-xin, SONG Xiao-long. Mechanical properties of shield tunnel with inclined bolt joint and temperature distribution law under fire[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 37-49. doi: 10.19818/j.cnki.1671-1637.2018.06.005
Citation: ZHANG Wen-jun, ZHANG Xin-xin, SONG Xiao-long. Mechanical properties of shield tunnel with inclined bolt joint and temperature distribution law under fire[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 37-49. doi: 10.19818/j.cnki.1671-1637.2018.06.005

Mechanical properties of shield tunnel with inclined bolt joint and temperature distribution law under fire

doi: 10.19818/j.cnki.1671-1637.2018.06.005
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  • Author Bio:

    ZHANG Wen-jun(1975-), male, associate professor, PhD, wjzhang@tju.edu.cn

  • Received Date: 2018-06-09
  • Publish Date: 2018-12-25
  • A three-dimensional solid model of circumferential composite segments and the circumferential inclined bolted joint was established using the finite element calculation software ABAQUS.The nonlinearity of the composite segment material was considered, and the elastoplastic constitutive model was adopted.The mechanical properties of the circumferential inclined bolted joint under normal temperature were analyzed.According to the heating up curve of HC, the heat transfer characteristics of the joint model were analyzed, and the temperature distribution laws of the composite segment lining and the circumferential inclined bolted joint under fire were studied.Analysis result shows that the use of a high-strength bolt can effectively reduce the opening of the joint and increase the joint stiffness.For high-strength bolts, the maximum axial stress of the inclined bolt is easy to yield at the initial stage, and the increase inbending moment and axial force of the joint has little influence on the stress of the bolt, but has more influence on deformation of the bolt.When the negative bending moment of the joint increases from 7 kN·m to 122 kN·m, the axial force of the joint increases from 368 kN to 734 kN, and the maximum strain of the inclined bolt increases by 1.6 times.When the positive bending moment of the joint increases from 53 kN·m to 182 kN·m, and the axial force of the joint increases from 903 kN to 1 056 kN, the maximum strain of the inclined bolt increases by 5.9 times.Under the normal temperature, a special antisymmetric distribution of the axial stress of the inclined bolt is shown near the seam.The axial stresses of the inclined bolt, except the joints are equal, is about 400 MPa, and the maximum absolute value of the axial stress at the joint can reach 700 MPa.In a fire, the fastest temperature rise is at the hand hole, and if the temperature reaches its highest, it can reach 1 000 ℃ in 80 min.The temperature of concrete at the seam reaches a stable temperature after 100 min, and at the nut after 150 min.This stable temperature is about 1 000℃.

     

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