Numerical analysis on flexural behavior of unbonded post-tensioned reinforced concrete beams considering the buckling and rupture of longitudinal reinforcement
12th National Conference on Earthquake Engineering(12NCEE)
巻, 号, ページ
出版年月
2022年6月27日
出版者
和文:
英文:
Earthquake Engineering Research Institute
会議名称
和文:
英文:
12th National Conference on Earthquake Engineering(12NCEE)
開催地
和文:
英文:
Salt Lake City
アブストラクト
Many reinforced concrete buildings were demolished due to damage to the structural and non-structural components after large earthquakes. It is important to develop structural systems that minimize damage and keep the original functions of buildings during and after an earthquake. A post-tensioned reinforced concrete (PRC) beam is one of the solutions frequently used to minimize the earthquake damage. Previously the authors tested three PRC beams with and without slab. All specimens showed flag-shaped hysteretic loops with high self-centering characteristics and relatively large energy dissipation. However, the stiffness and shear force decreased suddenly at large drifts due to the buckling and rupture of longitudinal reinforcement. This paper investigates the mechanisms contributing to the ultimate behavior of the tested PRC beams to propose a numerical tool. Numerical analyses were conducted to evaluate the ultimate behavior, including buckling and rupture of longitudinal reinforcement, using an inelastic multi-spring model. The numerical model well reproduced the shear force - drift angle relations and the point of buckling and rupture for the three PRC beam specimen.
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