축력비에 따른 수정된 단부 횡보강상세를 갖는 특수전단벽의 내진성능

천영수,박지영,Chun, Young-Soo,Park, Ji-Young 한국토지주택공사 토지주택연구원 2016 LHI journal of land, housing, and urban affairs Vol.7 No.1

이 논문은 최근 천영수 등(2011)에 의하여 제안된 벽체 단부 횡보강상세를 지닌 벽체를 중심으로 벽체의 구조성능 영향 변수들을 대상으로 한 실험결과와 그에 따른 내진거동 및 이력특성을 제시하고 있다. 제시된 결과는 동 벽체의 비선형이력특성을 규명함으로써 향후 성능기반설계의 적용을 위한 기초자료를 제공하게 될 것이다. 실험결과, 제안된 횡보강 상세를 채용한 실험체의 균열 및 파괴 양상은 축력과 내진철근의 적용 여부와 상관없이 유사한 경향을 나타내었으며, 기준에서 제시하고 있는 설계식에 의하여 실험체의 최대강도를 잘 예측할 수 있는 것으로 나타났다. 또한, 축력이 높을 수록 초기강성과 최대강도는 증가하나 변형능력은 떨어지는 경향이 있어 고 축력으로 인한 변형능력 감소에 대한 고려가 필요할 것으로 보이며, 고 축력이 작용하는 벽체의 경우 내진철근의 사용이 변형능력의 확보라는 관점에서 매우 효과적인 방안이 될 것으로 보임으로 가능하다면 소성힌지 영역은 내진철근을 사용한 경계요소로 보강하는 것이 바람직한 것으로 판단된다. In this paper, we propose experimental results, which target the major variables that influence the structural performance of a wall, as well as the resulting seismic and hysteretic behavior. Results also provide the basis for the application of performance based design by identifying the nonlinear hysteretic behavior of the wall with boundary element details recently proposed in previous study by Chun et al(2011). From the experimental results, the crack and fracture patterns of a specimen, which adopt the proposed boundary element details, showed similar tendencies regardless of whether axial force or high performance steel bars is applied. Furthermore, results show that the maximum strength of the specimen can be predicted accurately based on the design equation proposed by the standard. In addition, with a higher axial force, there is a tendency that both the initial load and maximum strength increase as deformation capacity reduces, requiring consideration of the reduced deformation capacity due to a high axial force. For walls under such high axial forces, using high performance steel bars is a very effective manner of enhancing deformation capacity. Therefore, reinforcing the plastic hinge region with boundary elements using high performance steel bars is preferable.

원커팅 철근보강 PHC 말뚝의 속채움 콘크리트 부착파괴 성능

천영수,심영종,박종배,Chun, Young-Soo,Sim, Young-Jong,Park, Jong-Bae 한국토지주택공사 토지주택연구원 2011 LHI journal of land, housing, and urban affairs Vol.2 No.4

말뚝두부와 기초판의 연결방법으로서 기존의 강선남김방식은 시공성이 좋지 않고, 말뚝두부에 파손 및 균열이 발생할 가능성이 높을 뿐만 아니라 현장 인명사고가 자주 발생하여 최근에는 대안적인 방법으로서 원커팅에 의한 철근보강 방식이 제안되어 사용되고 있다. 하지만 이러한 방법들은 역학적인 성능규명에 의하여 그 상세가 구체적으로 제안 또는 검증된 사례가 없다. 이 연구는 원커팅 철근보강 방식에 있어서 최적 보강상세를 제안 할 목적으로 후 타설된 말뚝 내 속채움 콘크리트와 말뚝간의 전단마찰 저항력의 부족으로 인한 파괴를 실험을 통하여 규명하고, 적정 채움 깊이를 제안하였다. 실험결과에 근거하여 말뚝 부착파괴 강도를 안전측의 값으로 0.4MPa를 가정한다면, 부착파괴 이전에 철근이 항복에 도달하도록 하기 위해서 속채움 콘크리트의 깊이는 최소한 PHC 450과 PHC 500의 경우 600mm 이상, PHC 600의 경우 1,000mm 이상 확보하여야 할 것으로 판단된다. Existing method protruding strands that are embedded in PHC pile to connect pile head and foundation slab shows poor constructibility. As this causes crack and damage in pile head and casualties often occurs in construction site during the work, alternative method called one-cutting method, in which pile above the ground surface and strands embedded in pile are completely cut and pile head is reinforced with rebar for connection with foundation slab, is currently adopted. However, the capacity of details for these methods are not mechanically proved. In this study, in order to suggest proper details of reinforcement for one-cutting method, failures due to lack of shear resistance between infilled concrete and PHC pile are analyzed through experiments and embedded depth with infilled concrete inside PHC pile is suggested. Assuming that slip failure strength is 0.4MPa, which is obtained from experiment conservatively, to have rebar yielded before slip failure, minimum depth of infilled concrete for PHC 450 and PHC 500, need to be 600mm above, and for PHC 600, 1,000mm above.

벽식구조 아파트건물의 강재이력형 댐퍼 적용성 평가

천영수,박지영,Chun, Young-Soo,Park, Ji-Young 한국토지주택공사 토지주택연구원 2012 LHI journal of land, housing, and urban affairs Vol.3 No.4

이 연구에서는 국내 아파트 건물의 주요 횡력저항시스템인 전단벽식 구조를 대상으로 제진장치의 적용 가능성을 검토해 보았다. 연구목적 달성을 위하여 ASCE/SEI 7-10 제진구조물 설계방법을 현재 설계 중이거나 이전에 설계된 4개의 대표적인 전단벽식 아파트에 적용하여 내진성능 확보를 위하여 요구되는 제진장치의 성능에 대하여 조사하였다. 연구결과, 전단벽식 아파트에 제진장치를 이용하여 내진성능을 확보하기 위해서는 탄성강성이 높은 전단벽의 영향으로 인하여 제진장치의 강성이 매우 커야 함을 알 수 있었다. 이와 같은 높은 강성의 제진장치는 현실적으로 구현하기 매우 어려울 수 있으므로 전단벽식 건물에 제진장치를 설계할 때 주의하여야 하며, 벽량이 많은 전단벽식 건물의 경우 강재이력형 제진장치의 적용에 한계가 있는 것으로 판단된다. In this study, the possibility of applying the damping devices to shear-wall dominant apartment buildings(SDA) was examined. In order to achieve research objectives, ASCE/SEI 7-10 design procedure for structures with damping systems applied to four representative apartment buildings which are under design or previously designed with the shear-wall dominant system, and the performances of damping devices were investigated. It is shown that in order to secure the seismic performance of SDA by using dampers, the stiffness of the dampers should be very large because of the effects of shear walls with the high elastic stiffness. But since this large stiffness is highly difficult to implement in reality, prudent decisions have to be made in designing the SDA with damping system and friction dampers with the high initial stiffness are more effective than hysteretic steel dampers.

시외통화수요의 요금탄력성에 관한 연구

천영수 濟州大學校 觀光産業硏究所 1996 産經論集 Vol.10 No.-

벽식구조 아파트건물의 고유주기 산정방법 ( Experimental Formula to Determine the Natural Period of Wall-slab Apartment Building Structures )

천영수,유석형,이리형 대한건축학회 1998 大韓建築學會論文集 : 構造系 Vol.14 No.4

현행 건축법에 반영되어 있는 벽식구조 아파트에 대한 고유주기산정식은 ATC 방법에 따른 것으로 1971년 발생한 San Fernando 지진에 의해 실 제 건물들이 진동한 기록을 근거로 제안된 실험식이나, 측정대상으로 하고 있는 건물들이 국내의 벽식구조 아파트와는 매우 상이한 성격의 건물들이며, 고유주기를 예측하기 위하여 도입된 변수들도 동 건물의 특성을 반영하기에는 부적합하여 고유주기를 예측함에 있어서 건물의 특성과는 다른 비현실적인 경향을 나타내고 있다. 따라서, 본 연구에서는 국내 벽식구 조 아파트건물을 중심으로 실시된 상시미진동 실험결과에 근거하여 보다 실제적인 데이터를 바탕으로 회귀분석을 실시하고 동 구조물에 대한 새로운 고유주기 산정방법을 제안하였다. 총 48개의 건물이 채용되었으며, 제안식의 타당성이 ETABS v6.13을 이용한 동적해석결과 와 비교되었다.

웨브벽체의 형상비가 T형벽체의 플랜지 유효폭에 미치는 영향

천영수,윤영호,양지수,강인석 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.7

This paper deals with the effect of the web wall's aspect ratio to the effective flange width of the T-shaped wall. In this study, the non-linear FEM analysis has been conducted in a parametric way, by varying heigth of the wall, length of the web wall, thickness of the flange wall and aspect ratio of the T-shaped wall. The results of the analysis clearly indicate that the most influential variable on the effective width is the web wall's aspect ratio and most of existing formulae to compute the effective flange width of the T-shaped wall based on a specified variable are not effective, since these formulae do not consider the web wall's aspect ratio.Based on the results of FEM analyses, the method to compute the effective width of the flange wall is suggested, and the validity of the proposed method is confirmed.

감쇠시스템을 적용한 라멘조 아파트의 내진성능평가

천영수,이범식,박지영,Chun, Young-Soo,Lee, Bum-Sik,Park, Ji-Young 한국토지주택공사 토지주택연구원 2017 LHI journal of land, housing, and urban affairs Vol.8 No.3

To proactively respond to internal and external changes such as the recent demographic change and rising demand for diversified housing types, this study investigated the framed-structure free plan public house model proposed by the LH to look at the seismic performance of framed-structure apartment according to damper system use through non-linear analysis. The effectiveness thereof was also examined in terms of performance and economy. As a result, the proposed damper system application method to framed-structure free plan public house model was found to meet the performance requirements of the present earthquake-resistant design (KBC2016) and effective to apply to designs. The max response displacement and max response acceleration were compared based on the nonlinear analysis. As a result, the building with damper system showed better earthquake resistance performance than earthquake-resistant structure thanks to the damper system, although the base shear of earthquake-resistant system was reduced by 20% in design. The damper system is expected to help reduce building damage while ensuring excellent earthquake resistance performance. In addition, the framework quantities of earthquake-resistant structure and structure with damping system were compared. As a result, columns were found to reduce concrete amount by about 3.9% and rebar, by about 7.3%. Walls showed about 12.6% reduction in concrete and about 10.7% in rebar. In terms of cost, framework construction cost including formwork and foundation expenses was expected to drop by about 5~6%.

철판삽입 합성전단벽의 전단강도와 내진거동

천영수,박지영,이종윤,Chun, Young-Soo,Park, Ji-Young,Lee, Jong-Yoon 한국토지주택공사 토지주택연구원 2017 LHI journal of land, housing, and urban affairs Vol.8 No.3

This study proposed hybrid coupled shear wall in the steel plate insertion method, which is capable of reinforcing the shear strength of the entire wall without increasing wall thickness in the wall-slab apartment buildings. The proposed hybrid coupled shear wall was tested for its effectiveness, shear strength and seismic behavior in experiment. As a test result, the shear strength improvement by the proposed hybrid coupled shear was found effective. Integral-type of steel plate insertion was found more effective than separate-type steel plate insertion. In this case, if the stud enforcement method proposed in this study was used, the shear strength of hybrid coupled shear wall was recommended to calculate using the KBC2016 0709.4.1(3) method. The steel plate inserted in the proposed method was found to have no significant impact on the final fracture behavior and bending strength of hybrid coupled shear wall. The shear strength at the final destruction of the wall was merely about 1/50 of the entire design shear strength. Thus, it is deemed that the wall was over excessively designed regarding the shear force in the existing design method. This finding indicates further study on wall designing to ensure effective and economic designing based on appropriate strength estimation under the destruction mechanism.

모의실험 분석중 구간평균기법의 개선을 위한 연구

천영수 한국시뮬레이션학회 1996 한국시뮬레이션학회 논문지 Vol.5 No.2

The purpose of this study is to make an improvement to the batch-means method, which is a procedure to construct a confidence interval(c.i.) for the steady-state process mean of a stationary simulation output process. In the batch-means method, the data in the output process are grouped into batches. The sequence of means of the data included in individual batches is called a batch-menas process and can be treated as an independently and identically distributed set of variables if each batch includes sufficiently large number of observations. The traditional batch-means method, therefore, uses a batch size as large as possible in order to. destroy the autocovariance remaining in the batch-means process. The c.i. prodedure developed and empirically tested in this study uses a small batch size which can be well fitted by a simple ARMA model, and then utilizes the dependence structure in the fitted model to correct for bias in the variance estimator of the sample mean.

전단벽 및 연결보의 거동

천영수 한국콘크리트학회 2014 한국콘크리트학회 학술대회 논문집 Vol.2014 No.10