Size effect on shear strength of reinforced concrete beams with tension reinforcement ratio

作者：Jeong Chan Yu; Kim Hyeong Gook; Kim Sang Woo; Lee Kang Seok; Kim Kil Hee^*

来源：Advances in Structural Engineering, 2017, 20(4): 582-594.

DOI：10.1177/1369433216658486

• compressive strength of concrete
• effective depth of beam
• reinforced concrete beam
• shear span-to-depth ratio
• shear strength
• size effect
• tension reinforcement ratio

It is well known that shear stress at peak of reinforced concrete beams decreases with increasing effective depth. Thus, several existing design codes and models have included various forms of formulas considering the size effect on shear strength of reinforced concrete beams; however, past experimental researches show that tension reinforcement ratio is also associated with the shear strength of reinforced concrete beams. To examine the effect of tension reinforcement ratio and effective depth on shear strength of reinforced concrete beams, this study has conducted experiments in which the effective depth (150, 300, 500, and 780mm) and tension reinforcement ratio (1%, 2%, and 3%) are employed as variables. Besides, a formula for the shear strength considering both variables is proposed based on data samples collected from the present experiment and previous research. The proposed formula gives predictions comparable to the results of existing shear tests. Furthermore, rational predictions are made for effective depth of beams, compressive strength of concrete, shear span-to-depth ratio, and even tension reinforcement ratio exceeding 3%.

• 出版日期2017-4