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김형열 ( Kim¸ Hyeong-yeol ),김광수 ( Kim¸ Kwang-soo ),이성열 ( Lee¸ Sung-yeol ),김도겸 ( Kim¸ Do-gyeum ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
This paper deals with simplified structural analysis of single- and double-span rigid frame types of reinforced concrete bridges. A number of equations are proposed to compute the moments due to the live load, dead load, and earth pressure of rigid portal frame type bridges. By using a finite element program coded in this study, 479 highway bridges having different height, span length, and span ratios are analyzed. On the basis of the results of structural analysis, the equations to compute moments of rigid frame type bridges are derived based on the multi linear regression analysis. All the values of correlation factors obtained in this study are over 0.998 and the results obtained by the proposed equations generally show an excellent correlation with the results of finite element analysis. The proposed equations can be directly used to compute the moments of rigid frame type of bridges, if simplified analysis of highway bridge is necessary.
김형열 ( Kim Hyeong-yeol ),이규완 ( Lee Kyu-wan ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
In recent years, a number of bridge monitoring systems are established to monitor the long-term behaviors of highway bridges. This paper presents the analysis of long-term monitoring results of thermal expansion for a steel box girder bridge in service. Based on the data collected from the thermocouples within the bridge, the expansion of bridge superstructure due to the temperature variations is computed by using an analytical equation. The absolute values of expansion obtained by analytical equation are compared with those of actual diplacements measured by the displacement transducers installed at bridge supports. The results of analysis indicate that the actual thermal expansion of the bridge superstructure is quite different than that by the analytical method. The results can be used to adjust the criterion for the data management in the system.
김형열(Kim, Hyeong-Yeol),송재준(Song, Jae-Joon),이영호(Lee, Young-Ho),이상윤(Lee, Sang-Yoon,)전복상(Jeon, Bog-Sang) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
This paper presents the results of a parameter study conducted to design an overall cross-sectional shape of a precast modular girder bridge. The design parameters are the design strength of concrete, the cross-sectional area of strands, and the cross-sectional dimentions of the girder. The optimal depth of the girder is identified as 1800 mm for a span length of 40 m.
김형열(Kim Hyeong-Yeol),유영준(You Young-Jun),박영환(Park Young-Hwan),박종섭(Park Jong-Sup) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper presents the durability characteristics of commercial GFRP rebars exposed to various environmental conditions Two types of GFRP rebars were tested by using the accelerated aging method A total of 264 rebar specimens were conditioned up to 132 days in the moisture, chloride, alkaline, and freeze-thaw environmental conditions The durability characteristics of conditioned rebars were obtained by comparing the tensile strength, horizontal shear strength, and elastic modulus between unconditioned and conditioned rebars The test results have shown that significant reduction In the mechanical properties of rebars has been Identified
강-콘크리트 합성 바닥판용 전단연결제의 합성 거동 연구
김형열(Kim Hyeong-Yeol),구현본(Koo Hyun-Bon) 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.1A
This paper presents the results of push-out test conducted for the perfobond rib shear connectors welded onto steel-concrete composite deck. Push-out test specimen consists of profiled steel sheeting, perfobond rib, reinforcement, and concrete. To provide longitudinal shear resistance between the profiled sheeting and the concrete, perfobond rib with a number of holes was used. The parameters considered in the design of perfobond rib were the spacing and location of holes, and effect of reinforcing bars placed in the holes. To validate the effectiveness of the proposed system, twelve specimens were fabricated and tested. Although the scope of test was limited in nature, the results of test have shown that the perfobond ribs can be effectively used for shear connection in the steel-concrete composite decks. 본 연구에서는 강-콘크리트 합성 바닥판용 유공판재형 전단연결재의 전단성능을 평가하기 위한 전단실험을 수행하고 그 실험결과를 고찰하였다. 전단 실험체는 절곡된 강판, 유공판재형 전단연결재, 철근, 콘크리트로 구성되었으며, 절곡된 강판과 콘크리트 사이에 작용하는 수평전단력에 저항할 수 있도록 다수의 구멍이 가공된 유공판재형 전단연결재가 적용되었다. 실험체 설계에 적용된 변수는 구멍의 간격과 위치, 구멍관통 철근의 유무이며, 총 12개의 실험체를 제작하여 전단실험을 수행하였다. 제한적 범위 내에서 수행한 실험결과에 따르면 유공판재형 전단연결재가 강-콘크리트 합성 바닥판에 효과적으로 사용될 수 있을 것으로 판단된다.
김형열(Kim, Hyeong-Yeol),이영호(Lee, Young-Ho) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
본 논문에서는 GFRP 복공판의 휨강성을 증가시키기 위해서 상부 및 하부플랜지가 강선으로 보강된 하이브리드 GFRP 복공판의 피로거동을 파악하기 위한 고정점 피로시험결과를 기술하였다. 피로하중의 최대 크기는 사용하중의 1.2, 1.6, 그리고 2.0배로 설정하였으며, 최소/최대 하중비는 0.1로 적용하였고, 총 3개 시편에 대하여 2백만회 반복하중을 재하시켰다. 피로시험결과에 따르면 본 연구에서 개발된 하이브리드 GFRP 복공판에 사용하중이 작용하는 경우 설계수명동안 피로는 발생하지 않을 것으로 예측할 수 있다.
김형열 ( Kim Hyeong-yeol ),유영준 ( You Young-jun ),박영환 ( Park Young-hwan ),박종섭 ( Park Jong-sup ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This paper presents the durability characteristics of commercial GFRP rebars exposed to various environmental conditions. Two types of GFRP rebars were tested by using the accelerated aging method. A total of 264 rebar specimens were conditioned up to 132 days in the moisture, chloride, alkaline, and freeze-thaw environmental conditions. The durability characteristics of conditioned rebars were obtained by comparing the tensile strength, horizontal shear strength, and elastic modulus between unconditioned and conditioned rebars. The test results have shown that significant reduction in the mechanical properties of rebars has been identified.