Effect of Coarse Aggregate Content on Cracking Shear Strength Of High-Strength Concrete Beams without Shear Reinforcement

• Main Authors: Fan Ling, 范櫺
• Other Authors: Chien-Hung Lin
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/76407693396442458589

碩士 === 國立中興大學 === 土木工程學系所 === 105 === The intention of this study was to investigate the shear behavior of concrete beams without shear reinforcement with different amount of coarse aggregate. A total of 16 beam specimens were made in this study. The compressive strength of concrete were 42 and 50 MPa. The coarse aggregate contents are 750 kg/m3, 850 kg/m3, 950 kg/m3 and 1050 kg/m3 . Two no. 5 bars and three no. 5 bars were used on the longitudinal reinforcement. The compressive strength, coarse aggregate content and axial reinforcement are the main experimental variables. The result shows that : 1. The cracking shear strength of rest beams increases with an increases of coarse aggregate content . 2. The coarse aggregate content dose not have a significant effect on the ultimate shear strength. 3. Beams with coarse aggregate content between 850 kg/m3 and 950 kg/m3 have better crack control ability when the concrete strength is 50 MPa. 4. The stiffness of beam decreases with an increase of coarse aggregate content. The stiffness reaches the largest when the content of coarse aggregate is 750 kg / m3. Increase of longitudinal reinforcement also increases the stiffness