Computers and Concrete

  • 제20권5호
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  • Pages.529-537
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  • 2017
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Thermo-mechanical behavior of prestressed concrete box girder at hydration age

  • Zhang, Gang (School of Highway, Chang'an University) ;
  • Zhu, Meichun (Department of Civil Engineering, Shanghai Normal University) ;
  • He, Shuanhai (School of Highway, Chang'an University) ;
  • Hou, Wei (School of Highway, Chang'an University)
  • 투고 : 2017.07.25
  • 심사 : 2017.08.19
  • 발행 : 2017.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

Excessively elevated temperature can lead to cracks in prestressed concrete (PC) continuous bridge with box girder on the pier top at cement hydration age. This paper presents a case study for evaluating the behavior of PC box girder during the early hydration age using a two-stage computational model, in the form of computer program ANSYS, namely, 3-D temperature evaluation and determination of mechanical response in PC box girders. A numerical model considering time-dependent wind speed and ambient temperature in ANSYS for tracing the thermal and mechanical response of box girder is developed. The predicted results were compared to show good agreement with the measured data from the PC box girder of the Zhaoshi Bridge in China. Then, based on the validated numerical model three parameters were incorporated to analyze the evolution of the temperature and stress within box girder caused by cement hydration heat. The results of case study indicate that the wind speed can change the degradation history of temperature and stress and reduce peak value of them. The initial casting temperature of concrete is the most significant parameter which controls cracking of PC box girder on pier top at cement hydration age. Increasing the curing temperature is detrimental to prevent cracking.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Central Universities of China

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피인용 문헌

  1. Performance of prestressed concrete box bridge girders under hydrocarbon fire exposure vol.23, pp.8, 2017, https://doi.org/10.1177/1369433219898102