3 tests are performed to analyze the specific performance and pullout strength of an anchor bolt which has a greater contact area with the concrete. In the case of connecting bar which connect the non-symmetric nuts together, the pullout strength greatly increased than the normal bolt cases.

• 김민석(디엔아이엔지니어링(주) 대표이사, 공학석사) | Kim Min Seok
• 조성우(디엔아이엔지니어링(주) 이사) | Cho Sung Woo
• 이완훈(청운대학교 토목환경공학과 교수, 공학박사) | Lee Wan Hoon 교신저자