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하태휴,조봉호,김태형,이두용,엄태성 한국강구조학회 2013 韓國鋼構造學會 論文集 Vol.26 No.5
Cyclic tests on modular building units for low-rise buildings composed of stud panels and a light-weight steelperimeter frame, were performed to evaluate the earthquake resistance such as stiffness, load-carrying capacity, ductility,and energy dissipation per load cycle. The strap-braced and sheeted stud panels were used as the primary lateralload-resistant element of the modular building units. Test results showed that the modular building units using thestrap-braced and sheeted stud panels exhibited excellent post-yield ductile behaviors. The maximum drift ratios were greaterthan 5.37% and the displacement ductility ratios were greater than 5.76. However, the energy dissipation per load cycle waspoor due to severe pinching during cyclic loading. Nominal strength, stiffness, and yield displacement of the modular buildingunits were predicted based on plastic mechanisms. The predictions reasonably and conservatively correlated with the testresults. However, the elastic stiffness of the strap-braced stud panel was significantly overestimated. For conservative design,the elastic stiffness of the strap-braced stud panel needs be decreased to 50% of the nominal value. 본 연구에서는 스터드패널과 경량철골골조로 구성된 모듈러건물 유닛의 강성, 하중재하능력, 연성능력, 에너지소산능력 등 내진성능을 평가하기 위하여 주기실험을 수행하였다. 모듈러건물 유닛의 횡력저항요소로서 스트랩브레이스 및 시트강판으로 보강된 스터드패널을 사용하였다. 실험 결과, 스트랩브레이스 및 시트강판 보강 스터드패널을 사용한 모듈러건물유닛은 우수한 연성거동을 보였다. 최대변위비는 5.37% 이상을 보였고, 변위연성도는 5.76 이상인 것으로 나타났다. 그러나 주기거동 동안 핀칭이 크게 발생하여 주기당 에너지소산량은좋지 않은 것으로 나타났다. 모듈러건물유닛의 소성메커니즘을 바탕으로 내진설계를 위한 강도, 항복변위, 탄성강성 등 설계식을 제안하였고실험 결과와 비교를 통하여 제안된 설계식을 검증하였다. 제안된 방법은 모듈러건물유닛의 하중재하능력, 강성 등 내진성능을 합리적으로 예측하였다. 그러나 스트랩브레이스 보강 스터드패널의 탄성강성은 크게 과대평가되었으므로, 안전한 내진설계를 위해서는 구조해석 시 탄성강성을 50%로 줄이는 것이 필요하다
하태휴,조봉호,김태형,이두용,엄태성,Ha, Tae Hyu,Cho, Bong-Ho,Kim, Tae Hyeong,Lee, Doo Yong,Eom, Tae Sung 한국강구조학회 2013 韓國鋼構造學會 論文集 Vol.25 No.5
본 연구에서는 스터드패널과 경량철골골조로 구성된 모듈러건물 유닛의 강성, 하중재하능력, 연성능력, 에너지소산능력 등 내진성능을 평가하기 위하여 주기실험을 수행하였다. 모듈러건물 유닛의 횡력저항요소로서 스트랩브레이스 및 시트강판으로 보강된 스터드패널을 사용하였다. 실험 결과, 스트랩브레이스 및 시트강판 보강 스터드패널을 사용한 모듈러건물유닛은 우수한 연성거동을 보였다. 최대변위비는 5.37% 이상을 보였고, 변위연성도는 5.76 이상인 것으로 나타났다. 그러나 주기거동 동안 핀칭이 크게 발생하여 주기당 에너지소산량은 좋지 않은 것으로 나타났다. 모듈러건물유닛의 소성메커니즘을 바탕으로 내진설계를 위한 강도, 항복변위, 탄성강성 등 설계식을 제안하였고 실험 결과와 비교를 통하여 제안된 설계식을 검증하였다. 제안된 방법은 모듈러건물유닛의 하중재하능력, 강성 등 내진성능을 합리적으로 예측하였다. 그러나 스트랩브레이스 보강 스터드패널의 탄성강성은 크게 과대평가되었으므로, 안전한 내진설계를 위해서는 구조해석 시 탄성강성을 50%로 줄이는 것이 필요하다. Cyclic tests on modular building units for low-rise buildings composed of stud panels and a light-weight steel perimeter frame, were performed to evaluate the earthquake resistance such as stiffness, load-carrying capacity, ductility, and energy dissipation per load cycle. The strap-braced and sheeted stud panels were used as the primary lateral load-resistant element of the modular building units. Test results showed that the modular building units using the strap-braced and sheeted stud panels exhibited excellent post-yield ductile behaviors. The maximum drift ratios were greater than 5.37% and the displacement ductility ratios were greater than 5.76. However, the energy dissipation per load cycle was poor due to severe pinching during cyclic loading. Nominal strength, stiffness, and yield displacement of the modular building units were predicted based on plastic mechanisms. The predictions reasonably and conservatively correlated with the test results. However, the elastic stiffness of the strap-braced stud panel was significantly overestimated. For conservative design, the elastic stiffness of the strap-braced stud panel needs be decreased to 50% of the nominal value.
하태휴(Ha, Tae-Hyu),심현주(Shim, Hyun-Ju),이은택(Lee, Eun-Taik),김주우(Kim, Joo-Woo),이철호(Lee, Chul-Ho),양재근(Yang, Jae-Keun),김상섭(Kim, Sang-Seup) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.3
HR plates (Hot-Rolled Plate) are produced by straightening hot-rolled steel coil with a primary objective to substitute for thick plates, thereby avoiding a number of difficulties encountered in the production and shipment of thick plates as well as relieving supply problems. In order to evaluate the applicability of HR plates to architectural structures under the KBC 2009 steel design provisions, a total of four full-scale welded built-up H-beams with simple supports were tested together with associated key material testing. The full-scale beam specimens were designed into two categories, or flexural-dominated versus shear-dominated such that both bending and shear strength could be effectively evaluated. The materials test showed that HR plates satisfy both the tensile mechanical properties and the CVN toughness required according to the current material specification. Both the flexural- and shear-dominated specimens exhibited sufficient strengths exceeding the nominal strengths specified in the KBC 2009, thus confirming the applicability of HR plates.
하태휴 ( Ha¸ Taehyu ),홍성걸 ( Hong¸ Sung-gul ),김승진 ( Kim¸ Seung-jin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
In the process of performance evaluation of existing structures, lots of mathematical models are applied to draw a reasonable conclusion. Fuzzy theory is considered as one of the attractive methodology because of the inherent uncertainty of the problem itself. For example, MinMax theory, Fuzzy-Bayesian theory and Fuzzy integration methods, etc. were attempted in the evaluation process. This study aims to propose the modified MinMax theory(Most widely-used and simplest method using fuzzy sets). The modification is on fuzzy rules using numerical equations instead of linguistic expressions. That is to make up for the defects that the number of rules geometrically increase as the evaluation items increase. By varying the constants of the typical polynomial equation, we can control the evaluation process satisfying general objectives of the evaluation and sensitivities of evaluated items.
하태휴(Ha, Tae-Hyu),이지형(Lee, Ji-Hyung),홍성걸(Hong, Sung-Gul) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.9
This study aims to estimate the lateral force resisting capacities of multi-story steel stud panel modular buildings. The lateral displacement of modular buildings composed of the rotation and slip deformation of joint and the shear deformation of stud-walls. The shear deformation of steel-stud walls with sheathing panels can be defined by combining several failure mechanisms according to the material properties of sheathing panels and connection detail. This study proposed the theoretical estimation of lateral force resisting capacities according to these procedures. In addition, a two-story modular structure made of steel stud-walls was tested under cyclic loading. The test result shows that the behavior of first story wall is governed by shear diaphragm action explained by equivalent bracing model. Finally this study suggests that lateral resistant behavior of multi story modular system can be explained by rigid body motion as well as shear diaphragm action, which is a characteristic behavior of modular building system caused by bolt connection between lower and upper unit modules.