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Steel and Composite Structures
  Volume 42, Number 5, March10 2022 , pages 671-683

Experimental study on long-term behavior of prestressed steel I-beam–concrete composite beams
Deokyong Sung and Seongwon Hong

    To investigate and predict the long-term time-dependent behavior, such as creep, shrinkage, and relaxation of PS strands, and prestress loss in prestressed steel–concrete composite beams, named Precom, full-scale tests were conducted and the collected data were compared with those obtained from the two proposed analytical models. The combined effective modulus method (EMM)-empirical model proposed with a flowchart considered the creep effect to determine the prestress loss. Conversely, the age-adjusted effective modulus method (AEMM) with CEB-FIP equation was developed to account for the concrete aging. The results indicated that the AEMM with CEB-FIP model predicts the long-term behavior of Precom effectively.
Key Words
    AEMM with CEB-FIP equation; combined EMM-empirical model; long-term time-dependent behavior prestressed steel I-beam-concrete composite beam (Precom)
Deokyong Sung:Department of Civil and Railroad Engineering, Daewon University College, 316 Daehak, Jecheon-si, Chungbuk 27135, Republic of Korea

Seongwon Hong:Department of Safety Engineering, Korea National University of Transportation,
50 Daehak-ro, Chungju-si, Chungbuk 27469, Republic of Korea

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