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论文类型：期刊论文

发表时间：2012-09-01

发表刊物：ACI STRUCTURAL JOURNAL

收录刊物：SCIE、EI、Scopus

卷号：109

期号：5

页面范围：705-713

ISSN号：0889-3241

关键字：bond fracture; flexural shear failure; shear strength; size effect

摘要：This study presents an analytical, shear strength prediction equation for lightly reinforced slender concrete beams without stirrups based on the phenomenological experiment observations. The concept of the loss of bond performance between concrete and longitudinal reinforcement was used in these beams to explain the potential cause for the sudden release of longitudinal reinforcement from wrapping concrete. In the proposed equation, shear capacity was related to bond fracture resistance by introducing a new parameter: Mode II fracture toughness K-IIc. The equation showed the size effect with effective depth to the power of -1/2 and was evaluated using test data published in other sources. Comparisons between the proposed formula and other prediction equations indicated that, for lightly reinforced slender concrete beams without stirrups, this developed formula can estimate the shear strength of beams with varying concrete strengths, shear span-depth ratios (a(s)/d), longitudinal reinforcement ratios, and beam depths with reasonable accuracy.