Analysis of the Effect of Anchor Bolt Depth on the Bond Strength of Plain Anchor Bolt in Concrete Hariyadi (a), Iza Syiriana Azizah (a), Ni Nyoman Kencanawati (a), Fathmah Mahmud (a), Akmaluddin (a), Suryawan Murtiadi (b)
a) Dept. of Civil Engineering, University of Mataram, Jl. Majapahit No. 62 Mataram, Indonesia
* hariyadi[at]unram.ac.id
b) Dept. of Civil Engineering, National Science and Technology Institute, Jl. Moh Kahfi II Srengseng Sawah Jagakarsa Jakarta Selatan, Indonesia
Abstract
An essential premise employed in the design and analysis of reinforced concrete structures is the assumption that the bond between the steel reinforcement and concrete is devoid of any slippage or displacement. The reinforcement steel is securely embedded in the concrete at a certain depth for the bond stress between steel reinforcement and concrete to work. The objective of this study is to investigate the effect of different anchorage depths on the bond strength of normal concrete.
These tests examined the compressive strength, shear strength, and bond strength of cylinder-shaped concrete samples (150 x 300 mm), double L-shaped concrete samples (300 x 200 x 75 mm), and 10 mm steel reinforcements embedded into cylinder-shaped concrete samples with anchorage depths of 50, 100, 150, 200, and 250 mm. The pull-out test is applied while the elongation deformation and the specific type of failure are observed.
The research findings indicate that the bond strength reduces as the variation in anchorage depth increases. It is observed that the amount of force needed to reach the yield point of the reinforcing steel remains relatively constant for each embedded length- however, the area of the embedded steel cover changes depending on the development length. The length of bond distribution is greater than the length of shear strength distribution, which indicates the loss of bond between the steel reinforcement and the concrete (bonding failure). The safety factor was determined to be more than 1.0, indicating that the anchor depth computed according to Indonesia^s standards for the structure is secure.
Keywords: plain anchor bolt, anchorage depths, bond strength, normal concrete
