• 한국강구조학회 논문집
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• 제29권4호
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• pp.261-268
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• 2017

본 논문에서는 강관철탑의 3차원 비선형해석 및 비교 검증 실험을 통하여 보조재의 역할 및 결구 거동 특성을 파악하였다. 특히 기존 철탑의 삼각결구를 단순화한 사각결구의 거동특성을 살펴보기 위하여 외측결구와 내측결구의 형상을 달리하고 각 결구의 다양한 조합을 통하여 보조재가 철탑의 내력에 미치는 영향을 살펴보았다.

• 전산구조공학
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• 제9권1호
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• pp.115-123
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• 1996

본 논문은 기하학적 비선형과 재료적 비선형을 고려하여 강구조 부재 및 골조의 비선형 해석을 위한 프로그램을 개발하고 강재의 응력도 변형도 관계를 정식화하였다. 본 프로그램의 효율성을 검증하기 위하여 단조 하중을 받는 H형강 보와 각형강관 기둥, 그리고 반복 수평력을 받는 브레이스 강재 라멘에 대한 수치해석을 행하였다. 본 그로그램에 의해 얻어진 결과는 대체적으로 기존의 실험 및 해석결과와 일치하였다.

• 한국지진공학회논문집
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• 제24권5호
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• pp.233-241
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• 2020

This paper is to investigate the retrofitting effect for a non-seismic reinforced concrete frame strengthened by perimeter steel moment frames with indirect integrity, which ameliorates the problems of the direct integrity method. To achieve this, first, full-scale tests were conducted to address the structural behavior of a two-story non-seismic reinforced concrete frame and a strengthened frame. The non-seismic frame showed a maximum strength of 185 kN because the flexural-shear failure at the bottom end of columns on the first floor was governed, and shear cracks were concentrated at the beam-column joints on the second floor. The strengthened frame possessed a maximum strength of 338 kN, which is more than 1.8 times that of the non-seismic specimen. A considerable decrease in the quantity of cracks for the strengthened frame was observed compared with the non-seismic frame, while there was the obvious appearance of the failure pattern due to the shear crack. The lateral-resisting capacity for the non-seismic bare frame and the strengthened frame may be determined per the specified shear strength of the reinforced columns in accordance with the distance to a critical section. The effective depth of the column may be referred to as the longitudinal length from the border between the column and the foundation. The lateral-resisting capacity for the non-seismic bare frame and the strengthened frame may be reasonably determined per the specified shear strength of the reinforced columns in accordance with the distance to a critical section. The effective depth of the column may be referred to as the longitudinal length from the border between the column and the foundation. The proposed method had an error of about 2.2% for the non-seismic details and about 4.4% for the strengthened frame based on the closed results versus the experimental results.

• 한국전산구조공학회논문집
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• 제15권2호
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• pp.315-327
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• 2002

본 연구의 목적은 패널영역을 고려한 2차 탄소성힌지해석을 이용한 평면 강뼈대구조물의 이산화 최적설계알고리즘을 개발하는데 있다. 강뼈대구조물의 일반적인 해석은 구조물의 거동에서 패널영역 변형의 효과를 고려하지 않는다. 최적설계의 목적함수는 강뼈대구조물의 중량을 함수로 취하였으며, 제약조건식은 하중저항계수법(AISC-LRFD1994)시방규정을 근거로 하였다. 강뼈대구조물의 해석에서 현실적인 모델 사용의 중요성을 입증하기 위해 접합부 모델에서 패널영역을 고려하지 않은 수치해석과의 비교로부터 이 모델의 타당성이 판명되어진다. 개발된 알고리즘은 범용 프로그램인 SAP2000의 치적설계결과와 비교하여 본 연구에서 개발된 최적화 알고리즘의 타당성을 입증하였다. 이 연구의 결과는 일반적인 강뼈대구조물의 설계방법보다 패널영역의 거동을 고려한 최적설계 알고리즘이 더 경제적인 설계라는 것을 나타내었다.

• 한국강구조학회 논문집
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• 제21권2호
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• pp.115-125
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• 2009

철근콘크리트 골조에 얇은 강판채움벽을 접합한 합성벽의 내진 성능을 연구하기 위한 실험을 실시하였다. 실험체로서 얇은 채움강판을 사용한 3층 합성벽을 사용하였다. 주요 실험 변수는 기둥의 철근비와 채움벽의 개구부이다. 비교를 위하여 철근콘크리트 채움벽과 철근콘크리트 골조에 대한 실험을 실시하였다. 강판채움벽을 갖는 합성벽 실험체는 철근콘크리트 채움벽과 동일한 하중재하능력을 나타내면서도 변형능력이 크게 향상되었다. 또한 철골 골조를 사용한 강판벽 시스템과 마찬가지로 우수한 강도, 큰 변형능력 및 에너지소산 능력을 나타냈다. RC 골조에 대한 강판채움벽의 보강효과로 기둥-보 접합부의 전단균열과 손상을 방지할 수 있었다. 스트립 모델을 사용한 해석 연구를 통하여 합성벽 실험체의 강성 및 강도를 예측하였으며, 해석결과를 실험결과와 비교했다.

• Steel and Composite Structures
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• 제3권5호
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• pp.333-348
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• 2003

The behaviour of composite frame - shear wall systems with regard to creep and shrinkage with high beam stiffness has been largely unattended until recently since no procedure has been available. Recently an accurate procedure, termed the Consistent Procedure (CP), has been developed which is applicable for low as well as for high beam stiffness. In this paper, CP is adapted for a class of composite frame - shear wall systems comprising of steel columns and R.C. shear walls. Studies are reported for the composite systems with high as well as low beam stiffness. It is shown that considerable load redistribution occurs between the R.C. shear wall and the steel columns and additional moments occur in beams. The magnitude of the load redistribution and the additional moment in the beams depend on the stiffness of the beams. It is also shown that the effect of creep and shrinkage are greater for the composite frame - shear wall system than for the equivalent R.C. frame - shear wall system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1117-1124
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• 2009

Under frame side sill of rolling stock structure is designed for preventing corrosion in order to meet mechanical requirements. However during long operation time more than 20 years, there are corrosion in the under frame side sill caused by environmental effect, vibration and etc. So, detection and evaluation of the corrosion ill the under frame nondestructive is one of important issues to extend their life time. Most of nondestructive methods are not easy to apply for detecting corrosion in the under frame side sill, since the under frame side sill consist of there layered with different material (stainless steel - stainless steel - mild steel) and each layer is connected by spot weld and plug weld. Fortunately, pulsed eddy current method claimed that it can be measured not only thickness change but also corrosion under their insulation layers. So, in this study, we have investigated performance of pulsed eddy current testing method by measuring thickness variation of fabricate of mock-up specimens. The investigation results obtained from mock-up specimens and the corrosion evaluation results of the aged rolling stocks will be presented.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 추계 학술논문 발표대회
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• pp.14-15
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• 2018

Logistics facilities are characterized by wide spans and high flooring, most of which are constructed with PC (Precast Concrete) methods to meet a wide range of commercial and industrial needs. However, the PC structure is a pin joint design, and the construction cost is increased due to the restrictions caused by the installation process, and the construction period is lengthened. In order to solve the above problem, SMART Frame, which is a structural system similar to the steel frame structure, was developed by embedding a steel frame at both ends of the PC. The purpose of this study is to analyze the erection time reduction effect of steel connected precast concrete components (SMART frames) for long span and heavy loaded logistics buildings compared to existing PC frames. For this study, a logistics building constructed with pin joint PC components is selected as a case. The result is compared with the existing PC frame to confirm the erection time reduction effect.

• 한국지진공학회논문집
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• 제18권2호
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• pp.95-103
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• 2014

The current AISC341-10 standard specifiesa value of 0.02 radian for the minimum rotation capacity of connections for the intermediate steel moment frame system. However, despite of the advances realized in the domains of performance evaluation method and analysis method, research onthe minimum rotation capacity of the intermediate steel moment frame systemsatisfying the seismic performance has not been conducted in detail. In this study, the intermediate moment frame systemisdesigned with respect to current standards and the seismic performance in accordance with the rotational capacity of connections is evaluated using the seismic performance evaluation method presented in FEMA-P695. The minimum rotation capacity of intermediate steel moment frames required to satisfy seismic performance as well as the major design values affecting the seismic performance of moment frame areestimated. To that goal, the design parameters are selected and various target frames are designed. The analysis models of the main nonlinear elements are also developed for evaluating seismic performance. The resultsshow that the 20-story structure doesnot meet the seismic performance even if it satisfies the rotation capacity of 0.02 radian.

• Steel and Composite Structures
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• 제48권3호
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• pp.321-333
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• 2023

This paper proposes a comprehensive investigation on lateral stiffness of corner-supported steel modular frame using splice connection. A full-scale modular frame with two stacked steel modules under lateral load is tested. Ductile pattern in the transfer of lateral load is found in the final failure mode. Two types of lateral stiffness, including tangent stiffness and secant stiffness, are defined from the load-displacement due to the observed nonlinearity. The difference between these two types of stiffness is found around 20%. The comparisons between the experimental lateral stiffness and the predictions of classical methods are also conducted. The D-value method using hypothesis of independent case is a conservative option for predicting lateral stiffness, which is more recommended than method of contraflexural bending moment. Analyses on two classical short-rod models, including fix-rod model and pin-rod model, are further conducted. Results indicate that fix-rod model is more recommended than pin-rod model to simplify splice connection for simulation on lateral stiffness of modular frame in elastic design stage.