• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.2-5
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• 2010

최근 공동주택 거주자의 공간변화 욕구에 대응하기 위하여 가변성 평면이 가능한 구조시스템에 대한 연구가 활발히 진행되고 있다. 이에 따라 건식벽체 구조시스템, 복합 무량 벽체 구조시스템, 격간벽 시스템 등 구조적으로 안정성이 확보되면서 공간가변성이 뛰어난 구조시스템이 대안으로 제시되었다. 본 연구에서는 격간벽 시스템의 지진해석을 통해 내진성능을 평가하였다. 비선형 정적해석 및 동적해석 결과 격간벽 시스템은 벽식 구조시스템에 비하여 초과강도가 작고, 연성이 다소 감소하지만 FEMA-356에서 정하는 붕괴 방지 수준을 만족하여 충분한 내진성능을 보유한 것으로 나타났다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.25 no.5
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• pp.397-404
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• 2012

Fragility curves show the probability of a system reaching a limit state as a function of some measure of seismic intensity. To obtain fragility curves of six and twelve story staggered wall structures with middle corridor, incremental dynamic analyses were carried out using twenty two pairs of earthquake records, and their failure probabilities for various intensity of seismic load were investigated. The performances of staggered wall structures with added columns along the central corridor and the structures with their first story walls replaced by columns were compared with those of the regular staggered wall structures. Based on the analysis results it was concluded that staggered wall structures with central columns have the largest safety margin for the same level of seismic load.

• Journal of the Earthquake Engineering Society of Korea
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• v.16 no.3
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• pp.43-50
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• 2012

The FEMA P695 document proposed a methodology to evaluate the collapse safety of a structure and the validity of the seismic design coefficients. In this study, the seismic performance of six- and twelve-story staggered wall structures with a middle corridor was evaluated based on the FEMA P695 procedure. The analysis results of the prototype structures were compared with those of the structures with an increased coupling beam depth or an increased re-bar ratio of the coupling beams in order to investigate the effect of retrofit. The adjusted collapse margin ratios (ACMR) of the model structures obtained from incremental dynamic analyses turned out to be larger than the specified limit states of an ACMR of 20%, which implies that the analysis model structures have enough strength against design level earthquakes. It was also observed that the increase in the re-bar ratio of the coupling beams between the staggered walls was more effective in increasing the ACMR than an increase in the depth of the coupling beams.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.5
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• pp.574-579
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• 1995

To investigate the effect of the midsummer drainage method on growth and lodging characters, Dongjinbyeo was direct seeded on dry paddy field under 4cm of soil depth at May 1 by seeding machine. Three kind of drainage methods were treated such as, once in 20day, towice in 20, 30 days and 3 times 20, 30, 40 days after flooding. As increase the drainage times, the culm and internode length were shorter, culm wall of 4th internode was thicker, breaking weight was heavier, height of center weight was lower, lodging index was reduced, and dry weight of root was increased. Field lodging occured seriously at none drainage but didn't, with two or three times of drainage. Grain yield was not shown significantly different compared with constant flooding irrespective of midsummer drainage times. Therefore two or three times of midsummer drainage could be recommended as the effective water management for the reduction of lodging occurance in direct seeding culture on dry paddy field.