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Design method for checking tensile stresses under service loads in cracked prestressed concrete members with 2,400‐MPa strands
Author(s) -
Joo HyoEun,
Han SunJin,
Lee Deuckhang,
Ju Hyunjin,
Seo SooYeon,
Kim Kang Su
Publication year - 2020
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1681
Subject(s) - structural engineering , ultimate tensile strength , prestressed concrete , flexural strength , materials science , stress (linguistics) , reinforcement , composite material , engineering , philosophy , linguistics
Summary The ACI 318‐14 building code requirements specify that the net tensile stresses of prestressing strands under service loads ( Δ f ps ) shall be limited to 250 MPa for proper crack control of prestressed concrete (PC) members which are classified as Class C. However, as high‐strength prestressing strands with a tensile strength of 2,400 MPa have recently been developed and applied to PC members, this requirement needs to be reviewed. In this study, experiments and analysis were carried out in order to investigate the Δ f ps of PC members with the recently developed 2400 MPa strands, and in the test, the strain distributions, flexural crack widths, and stress change in bonded prestressed reinforcement were measured in detail according to the applied loads. In addition, the minimum magnitudes of effective prestress to satisfy the stress limitation of the net tensile stress of prestressing strands specified in the current design code were estimated using a nonlinear flexural analysis model, and a simplified design equation was proposed for a simple calculation of the Δ f ps at the design stage.