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SONG Rui-nian, ZHAN Yu-lin, LIU Fang, ZHAO Ren-da. Long-term push out test and finite element analysis of steel-concrete composite specimens[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 36-45. doi: 10.19818/j.cnki.1671-1637.2019.03.005
Citation: SONG Rui-nian, ZHAN Yu-lin, LIU Fang, ZHAO Ren-da. Long-term push out test and finite element analysis of steel-concrete composite specimens[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 36-45. doi: 10.19818/j.cnki.1671-1637.2019.03.005
shu

Long-term push out test and finite element analysis of steel-concrete composite specimens

doi: 10.19818/j.cnki.1671-1637.2019.03.005
  • 1.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610041, Sichuan, China

  • 2.

    Sichuan Highway Planning, Survey, Design and Research Institute Ltd, Chengdu 610031, Sichuan, China

  • 3.

    National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation, Southwest Jiaotong University, Chengdu 611756, Sichuan, China

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    Abstract
  • The long-term interface slip and strain development process for steel-concrete composite specimens with different shear connectors were investigated through the push out test and finite element method. Referring to the standard specimen of push out test in the Eurocode 4, two sets of specimens were designed for the long-term push out tests. The studs and PBLs were used as the shear connectors, respectively, the long-term load was applied by screw rods, and the interface slip, concrete strain and steel girder strain were measured during the long-term loading process. The long-term deformations of concrete specimens with the dimensions of 150 mm×150 mm×300 mm were loaded and tested synchronously to calculate the concrete creep coefficient. The effect of creep model on the calculation result was compared, and different concrete creep simulation methods were discussed. Research result shows that the interface slip and concrete strain increase rapidly at the initial stage of loading and keep stable in 120 d after loading. The maximum interface slips of stud specimens and PBL specimens are 0.162 and 0.068 mm, respectively, and located at the bottom of interface. The maximum concrete strains of stud specimens and PBL specimens are 7.30×10-5 and 1.34×10-4, respectively, and located at the bottom of concrete slab. The steel girder strain remains basically stable during the whole test process. There is no obvious stress redistribution. The maximum steel girder strains of stud specimens and PBL specimens are 3.7×10-5 and 6.5×10-5, respectively, and located at the top of steel girder. The concrete creep is the main factor affecting the long-term performance of steel-concrete composite specimen. The errors between the concrete creep coefficients calculated by different concrete creep models and the test values are 60%-140%, indicating that the concrete creep model has a significant impact on the finite element results. When using the exponential function to fit the test result of concrete creep coefficient, the fitting error is 2.4%. The error between the concrete creep coefficient calculated by the CEB-FIP90 model and test value is 3.71% at the later loading stage. The CEB-FIP90 model is recommended to calculate the concrete creep coefficient when the actual test cannot be carried out.

     

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