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김철구(Kim, Chul-Goo),엄태성(Eom, Tae-Sung),박홍근(Park, Hong-Gun),김태완(Kim, Tae-Wan) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.12
For small buildings designed to primarily resist gravity load, lap splices of longitudinal reinforcement are used in columns at the regions (e.g. at the bottom of the 1st floor) where flexural yielding is anticipated. Although not allowed under cyclic loading repeated in large inelastic range, such splices can be used as an alternative for the convenience of construction in small buildings where a limited ductility is required. In this study, cyclic loading test was performed for columns using lap splices at the plastic hinge regions. The length and offset bar details of lap splices and the ratio of shear span and section height (or aspect ratio) were considered as the test parameters. Non-seismic hoops of 90-degree end hooks were provided over the lap length. Test results showed that the strength and ductility of columns were significantly varied depending on the offset bar details and length of lap splices. In addition, the aspect ratio also had significant impact on the performance of lap splices due to change of the bond demand in the splice zone. The columns lap spliced in the plastic hinge zone were vulnerable to vertical cracking (or concrete splitting) along the lap length. Based on the test results and the review of existing studies, design recommendations for calculating lap spliced length of columns at plastic hinge zone were proposed.
소규모 건축물을 위한 과소보강된 콘크리트 보-기둥 접합부의 내진성능
김철구(Kim, Chul-Goo),엄태성(Eom, Tae-Sung),박홍근(Park, Hong-Gun),김태완(Kim, Tae-Wan) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.3
In one or two story low-rise buildings, generally, hoops have not been used in the beam-column joints due to lack of proper design codes and difficulty in construction. Further, such buildings show weak-column and strong-beam behavior under seismic loading because architecturally small size columns are preferred and relatively low axial loads are applied to the columns. In such conditions, beam-column joints and the overall structures are expected to be vulnerable to earthquake loading. Therefore, in this study, lightly reinforced concrete beam-column connections were studied. Cyclic loading tests were performed to evaluate the strength of beam-column joints. The test parameters were reinforcement ratio and details of joint hoops, and types of joints (i.e. exterior or interior joint). The test results showed that the shear strength of exterior joints was mainly affected by the joint hoop ratio and the development length of beam longitudinal reinforcement. The exterior joints with volumetric ratio of hoops higher than 0.58% successfully attained the joint shear strength specified in ASCE41-13. The interior joints, on the other hand, achieved joint shear strength 23~70% higher than the specified strength even without joint hoops.
김철구(Kim, Chul-Goo),박홍근(Park, Hong-Gun) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 ALC 프리즘의 전단부착강도에 대해 실험적으로 평가하였다. 실험결과, ALC 블록 계면에서의 압축응력이 증가할 수록 전단부착강도는 증가하였고, 최대하중 이후 잔류응력도 함께 증가하였다. ALC 블록을 사용한 벽체의 내진성능 평가시 ALC 블록과 모르타르 계면에서의 마찰계수를 0.75로 보는 것(ACI 523.4R)은 적절하다고 판단된다. In this study, the direct shear bond strength between ALC blocks and thin-bed mortar was experimentally evaluated. Test results showed that the clamping stress between the ALC blocks and the mortar incrased the shear bond strength and the residual strength. The coefficient of friction between ALC blocks of 0.75 proposed in ACI 523.4R is appropriate.