• Structural Engineering and Mechanics
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• 제41권1호
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• pp.95-112
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• 2012

In order to analyze the experimental hysteretic behavior of the in-plane loaded reinforced grouted multi-ribbed aerated concrete blocks masonry walls (RGMACBMW), we have carried out the pseudo static testing on the six specimens of RGMACBMW. Based on the test results and shear failure characteristics, the shear force hysteretic curves and displacement envelope curves of the models were obtained and discussed. On the basis of the hysteretic curves a general skeleton curve of the shear force and displacement was formed. The restoring model was adopted to analyze the seismic behavior and earthquake response of RGMACBMW. The deformation capacity of the specimens was discussed, and the formulas for calculating the lateral stiffness of the walls at different loading stages were proposed as well. The average lateral displacement ductility factor of RGMACBMW calculated based on the test results was 3.16. This value illustrates that if the walls are appropriately designed, it can fully meet the seismic requirement of the structures. The quadri-linear restoring models of the walls degradation by the test results accurately reflect the hysteretic behaviors and skeleton curves of the masonry walls. The restoring model can be applied to the RGMACBMW structure in earthquake response analysis.

• 국제초고층학회논문집
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• 제4권3호
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• pp.191-198
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• 2015

It is important to accurately predict structural responses to external excitations such as typhoons and earthquakes when designing structures for serviceability. One of the key procedures to predict reliable vibration responses is to evaluate accurate structural dynamic properties using finite element (FE) models, which properly represent the realistic behavior of buildings. In the case of historic masonry buildings, structural damage could also be caused by ambient vibrations or impacts. Therefore, the preservation plans of historic buildings for low-level vibrations or impacts should be provided by analyzing structural damages within serviceability levels. For this purpose, it is required to provide FE model construction and response analysis methods verified with field measurement data. In this research, long-term field measurement was performed for a cathedral and its dynamic properties were evaluated using measured data. Then, the model was calibrated based on the measured dynamic properties and an overall construction method for the masonry cathedral was proposed. Using the measured accelerations, the vibrations of the belfry were analyzed using the calibrated FE model and finally, the FE model for the cathedral was verified by comparing the measured accelerations with the modeled results.

• Steel and Composite Structures
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• 제41권6호
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• pp.861-871
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• 2021

This study aims at investigating the hysteretic performance of a novel composite wall panel fabricated by infilling aerated concrete blocks into a novel light-steel frame used for low-rise residential buildings. The novel light-steel frame is consisted of two thin-wall rectangular hollow section columns and a truss-beam assembled using patented U-shape connectors. Two bare light-steel frames and two composite wall panels have been tested to failure under horizontal cyclic loading. Hysteretic curves, lateral resistance and stiffness of four specimens have been investigated and analyzed. Based on the testing results, it is found that the masonry infill can significantly increase the lateral resistance and stiffness of the novel light-steel frame, about 2.3~3 and 21.2~31.5 times, respectively. Failure mode of the light-steel frame is local yielding of the column. For the composite wall panel, firstly, masonry infill is crushed, subsequently, local yielding may occur at the column if loading continues. Hysteretic curve of the composite wall panel obtained is not plump, implying a poor energy dissipation capacity. However, the light-steel frame of the composite wall panel can dissipate more energy after the masonry infill is crushed. Therefore, the composite wall panel has a much higher energy dissipation capacity compared to the bare light-steel frame.

• 한국구조물진단유지관리공학회 논문집
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• 제15권4호
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• pp.116-124
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• 2011

일반적으로 조적조는 시공이 용이하고 경제적인 구조로서 국내뿐만 아니라 해외에서도 가장 오래되고 광범위하게 사용되는 구조이다. 조적벽을 RC 골조에 장막벽으로 사용하는 채움벽 형태의 구조는 시공이 용이하고 경제적이기 때문에 저층 주거용 건물, 학교건물 등에 많이 적용되고 있으나, 설계시에는 비구조부재로 취급되어 채움벽의 효과를 반영하지 않고 있다. 본 연구에서는 기존의 사각형 조적개체의 횡력에 대한 취약성을 개선하기 위해 개발된 육각형 블록을 RC 골조 채움벽에 적용한 채움벽 골조에 대한 구조실험을 수행하여 육각형블록 조적채움벽의 효과를 평가하고자 하였다.

• 한국구조물진단유지관리공학회 논문집
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• 제19권3호
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• pp.113-121
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• 2015

조적조 건축물은 국내 소규모 주택의 많은 부분을 차지하지만 취성적 거동 및 낮은 연성능력으로 현재에는 사용빈도가 많이 낮아졌다. 그럼에도 불구하고 조적조 건축물의 낮은 건축비, 재료의 친환경성은 국외를 중심으로 새롭게 각광 받으면서 구조적 단점을 해결하고자 많은 연구가 진행 중이다. 본 연구에서는 조적벽체 및 교차부 실험체를 제작하여 신축줄눈 유 무에 따른 구조적 거동의 차이를 확인하고, 연결철물 (스틸플레이트, 스테인리스 트위스트바) 삽입에 따른 보강효과를 검증하였다. 실험결과를 통해 스틸플레이트를 삽입한 실험체는 내력이 증가되어 실험체의 강성이 향상되었으며, 스테인리스 트위스트바를 삽입한 실험체는 연성능력이 향상되어 취성파괴가 발생하지 않아, 연결철물 삽입에 따른 보강효과는 우수한 것으로 나타났다.

• 한국지진공학회논문집
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• 제16권6호
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• pp.37-46
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• 2012

In Korea, most existing school buildings have been constructed with moment frames with un-reinforced infill walls designed only considering gravity loads. Thus, the buildings may not perform satisfactorily during earthquakes expected in Korea. In exterior frames of the building, un-reinforced masonry infill walls with window openings are commonly placed, which may alter the structural behavior of adjacent columns due to the interaction between the wall and column. The objective of this study is to evaluate the seismic performance of existing school buildings according to the procedure specified in ATC 63. Analytical models are proposed to simulate the structural behavior of columns, infill walls and their interaction. The accuracy of the proposed model is verified by comparing the analytical results with the experimental test results for one bay frames with and without infill walls with openings. For seismic performance evaluation, three story buildings are considered as model frames located at sites having different soil conditions ($S_A$, $S_B$, $S_C$, $S_D$, $S_E$) in Korea. It is observed that columns behaves as a short columns governed by shear due to infill masonry walls with openings. The collapse probabilities of the frames under maximum considered earthquake ranges from 62.9 to 99.5 %, which far exceed the allowable value specified in ATC 63.

• 한국산학기술학회논문지
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• 제14권12호
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• pp.6504-6513
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• 2013

본 연구에서 농촌주택을 대상으로 농촌주택의 구법과 재료의 지역별 시기별 변화 특징 분석결과, 지붕형태는 팔작지붕/우진각지붕(1970)-평지붕(1980)-맞배지붕(1990), 지붕구조재료는 한식목조/간이한식목조-파라펫눈썹지붕/경사슬래브-양식목조-경량철골조, 지붕마감재료는 초가/한식기와-슬레이트-시멘트/강판-아스팔트슁글/샌드위치패널/몰탈방수, 벽체구조재는 한식목조/간이한식목조-시멘트조적조-RC조-경량철골조/양식목조, 벽체마감재료는 흘미장/회벽-치장벽돌쌓기/시멘트미장위 페인트마감-자연석치장/사이딩/타일, 담장재료는 전시기별로 돌담과 시멘트블록, 마당재료는 흙바닥, 콘크리트가 사용된 것으로 나타났다. 지역별 변화특징으로 주택구조, 지붕형태, 지붕구조재료, 벽체마감재료, 외부공간에서 담장재료와 마당재료는 북부지역, 중부지역, 남부지역별로 농촌주택 특징변화의 차이가 나타났으며, 지붕구조재료, 벽체구조재료는 지역별로 유사한 변화양상이 나타나는 것으로 분석되었다.

• 한국전산구조공학회논문집
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• 제28권3호
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• pp.293-300
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• 2015

본 연구에서는 저층 조적채움벽 철근콘크리트 골조 구조물의 내진보강 전과 후에 대하여 강제 진동 실험과 상시 진동 계측을 수행하였으며 시스템 식별과정을 통하여 구조물의 동특성을 구하고 해당 구조물과 유사한 동특성을 보이는 해석 모델을 만들었다. 시스템 식별 결과 댐퍼가 설치된 x방향의 감쇠비가 증가되었으며, 해석 모델과 비교한 결과 추가 설치된 부재들(전단벽과 댐퍼)의 유효 강성은 부재의 총단면 강성의 50%만이 발현되어 해당 부재들이 기존의 구조물이나 부재와 완전히 일체화되지는 않음을 알 수 있었다. 또한, 추가 설치된 기초의 y방향 구속조건을 핀으로 하여야 동특성을 일치시킬 수 있었는데, 이는 새로운 기초가 설치되며 해당 지질의 특성이 변화되었기 때문으로 보인다.

• Earthquakes and Structures
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• 제12권3호
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• pp.309-319
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• 2017

A new method is suggested for the retrofitting of torsionally sensitive buildings. The main objective is to eliminate the torsional component from the first two natural modes of the structure by properly modifying its stiffness distribution via selective strengthening of its vertical elements. Due to the multi-parameter nature of this problem, state-of-art optimization schemes together with an ad-hoc software implementation were used for quantifying the required stiffness increase, determine the required retrofitting scheme and finally design and analyze the required composite sections for structural rehabilitation. The performance of the suggested method and its positive impact on the earthquake response of such structures is demonstrated through benchmark examples and applications on actual torsionally sensitive buildings.

• 한국농촌건축학회논문집
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• 제4권2호
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• pp.49-62
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• 2002

The purpose of this study was to investigate and analyze the building process and characteristics of Suncheon American missionary compound-missionary dwellings, medical clinics, schools and churches, for the sake of giving fundamental facts to the researcher of this field. The results of the study is summarized as follows. The construction participants of Suncheon missionary architecture are American supervisor- Rev. Preston, Elder Swinehart and Doctor Timmons, Korean christian labors, Chinese masons and Japanese carpenters. The characteristics of architectures are described as the space composition according to American life style, the architectural form of American colonial style. And also the masonry structure using the Korean domestic stones and bricks and imported various materials- such as the cements, timbers, glasses, doors and windows, etc- from the North America.