Effects of Short Stud Arrangement on Flexural Behavior of Ultra-High Performance Concrete Composite Bridge Decks
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1.College of Civil Engineering, Tongji University, Shanghai 200092, China;2.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China

Clc Number:

U443.33

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    Abstract:

    In order to investigate the effects of short stud arrangement on flexural behavior of steel-ultra-high performance concrete (UHPC) composite bridge decks, flexural tests of two full-scale segmental bridge deck specimens with a stud spacing of 200 and 300 mm respectively were performed, and a finite element parametric analysis based on the UHPC plastic damage model was conducted. The test results show that, as the stud spacing of partially-composited bridge decks increases from 200 mm to 300 mm, when the UHPC cracking reaches up to 0.05 mm in width, the corresponding load increases by 12.5 %. The main contributor is the weakening of the steel-UHPC combination effect. The average tensile strain of the UHPC is 1 878×10-6 as the cracking reaches 0.10 mm in width, accounting for about 59 % of the material ultimate tensile strain. The parametric analysis shows that as the stud spacing increases from 100 mm to 400 mm, the elastic bending stiffness decreases by 14.1 %, while the cracking load increases by 84.2 %. The increase of the short stud spacing makes the partially-composited bridge deck tend to be more mechanical-economical, but attention should be paid to the fatigue damage of the stud because of the too large stud spacing.

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XU Chen, ZHANG Lepeng, JIANG Zhen, MA Biao. Effects of Short Stud Arrangement on Flexural Behavior of Ultra-High Performance Concrete Composite Bridge Decks[J].同济大学学报(自然科学版),2021,49(8):1088~1096

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History
  • Received:April 23,2021
  • Online: August 31,2021
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