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주대봉 ( Joo Dae-bong ),고영권 ( Ko Young-kwon ),양근혁 ( Yang Keun-hyeok ),변항룡 ( Byeon Hang-ryong ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
The flexural behavior of masonry wall strengthened with prestressed wire-ropes was examined and compared with that of unstrengthened masonry wall. Test results showed that the ultimate strength and energy dissipation capacity of strengthened masonry wall were higher than those measured from unstrengthened masonry wall by 208% and 207%, respectively. In addition, the unstrengthened masonry wall failed in the rocking while the strengthened masonry wall showed rocking and diagonal tensile failure modes, indicating that the developed strengthened procedure has a significant influence on the failure mode of masonry wall.
긴장재 편심이 외부 포스트텐션 경량콘크리트 보의 휨 거동에 미치는 영향
주대봉(Joo Dae-Bong),양근혁(Yang Keun-Hyeok),변항용(Byun Hang-Yong) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The present study examined the effect of tendon eccentricity on the flexural behavior of external post-tensioned lightweight concrete beams under a symmetrical two-point top loading. The designed compressive strength and unit weight of concrete were 35 ㎫ and 1800 ㎏/㎥, respectively. Test results revealed that the ductility of beam specimens decreased as the tendon eccentricity increases. The stress increase in the unbonded external tendon at ultimate was commonly higher than predictions of ACI 318-08 equations.
주대봉(Joo, Dae-Bong),양근혁(Yang, Keun-Hyeok),변항용(Byeon, Hang-Yong) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
The present study reports the flexural behavior of post-tensioned lightweight concrete continuous one-way slabs subjected to uniform loads. Test results showed that a minimum amount of mild longitudinal reinforcement that is specified in ACI 318-08 was required to control a crack width of the post-tensioned lightweight concrete slabs. The measured flexural capacity of slab specimens and stress increase of the unbonded tendons were higher than predictions obtained from ACI 318-08 provision.
프리스트레스트 와이어로프로 비부착 보강된 콘크리트 벽돌 조적벽의 내력 및 연성
양근혁(Yang Keun-Hyeok),주대봉(Joo Dae-Bong),변항용(Byun Hang-Yong) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.4
Three full-scale retrofitted unreinforced masonry (URM) walls and an unstrengthened URM wall were tested under constant axial load and cyclic lateral loads in order to evaluate the effect of a strengthening procedure developed using unbonded prestressed wire rope units on enhancing the in-plane shear strength and ductility of unreinforced concrete brick masonry walls. The spacing of wire ropes varied between 150 ㎜ and 450 ㎜ at the constant wall aspect ratio of 0.85. The ductility of the walls tested was evaluated using the work damage indicator, suggested by Sheikh and Khoury, calculated at each loading step from the hysteretic loops. The in-plane shear strength of walls tested was also compared with predictions obtained from the simple equations proposed to identify the shear transfer capacities of masonry and wire ropes. Test results showed that the developed strengthening procedure was highly effective in enhancing the shear cracking strength, ultimate shear strength and ductility of URM walls and controlling crack propagation along head and bed mortar joints. Higher shear strength and work damage indicator were observed in the retrofitted URM walls than in unstrengthened URM wall by 2.85 and 3.48 times, respectively, for sw of 150 ㎜, by 2.41 and 3.08 times, respectively, for sw of 300 ㎜ and by 2.05 and 2.14 times, respectively, for sw of 450 ㎜, where sw is the spacing of inclined wire ropes. The shear capacities predicted from the proposed simple equations were in good agreement with test results.