Đánh giá khả năng chịu cắt của cấu kiện bê tông cốt thép không có cốt thép ngang theo TCVN 5574-2012 và một số tiêu chuẩn khác

Tóm tắt

Several structural reinforced concrete members are constructed without shear reinforcement such as slabs, footings, and lightly stressed members. The design of these members for shear has become an issue of debate as the shear capacity according to various building codes are very different. The paper investigates the design shear strength of reinforced concrete beams without transverse reinforcement using provisions from Vietnam Standard 5574-2012, ACI 318-14, EC2 EN 1992-1:2004, and BS 8110-1:1997. The results show that Vietnam Standard 5574-2012 does not account for the influence of longitudinal tension reinforcement ratio, shear span ratio, and size effect on the shear resistance provided by the concrete which are the important factors incorporated in the other codes. Comparisons of the design shear strength versus concrete strength and axial load level are also carried out among these four building codes.