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우상익,정경섭,김현성 충북대학교 건설기술연구소 1999 建設技術論文集 Vol.18 No.1
Hole-drilling method is a widely accepted method for determining residual stresses from the relaxation data obtained by a strain-gauge rosette. In this study, residual stresses is measured by hole-drilling process for the uniform stress field by uniform tension in a butt weld. The residual stress distributions patterns were; determined by ASTM E-387 hole drilling method. Also, residual stresses measured by strain gauge compare to simplified residual stress distributions in existing studies. And, to calculate the welding distortions, we have considered the formulas proposed by some investigators. As results, welding distortions and residual stress were agree with results of the existing available other experiment.
우상익,정경섭,이성행 충북대학교 건설기술연구소 1999 建設技術論文集 Vol.18 No.2
In this paper, for the purpose of the practical field application of high flowable concrete that requires neither vibration nor compaction, a study on standardizing lateral pressures of form work is required, because of the idea that lateral pressures of super-workable concrete will be larger than those of general concrete, as well as what regulation of form work design is not properly specified. To estimate lateral pressures of form work in super workable concrete and general concrete, we mocks up in height 3m, in width 2.5m, in 0.3m thickness with steel form work, measures lateral pressures by pressure meter, and strain-gauge that were attached to form tie. The test results were compared with the results calculated by the standard specification in concrete. Using the results, the maximum lateral pressure of form work in super workable concrete is 1.64 times larger than that of general concrete, and almost equals liquid pressure with unit weight in concrete.
우상익,김경남,이성행,정경섭,Wu, Sang Ik,Kim, Kyoung Nam,Lee, Seong Haeng,Jung, Kyoung Sup 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.2
As a special infrastructure, it is important that the suspension bridges which were designed by using the cable are carefully maintained and safely inspected after their construction, more than what is done in other cases of bridge structures. However, the structural analysis for their design and maintenance has considered only the simplified geometric shape of the structure. Particularly, it is not easy to make the modeling analyze the bridge structure including detailed steel deck plates. In this paper, we evaluated the structural behaviors and performances of the completed earth-anchored suspension bridge that was in a completed state through both the tension of hanger member and their computational analysis. We considered the frame system and the detailed steel deck plates that were especially added into the modeling to take more precision analysis about it. We also applied hanger tensions converted by the natural frequency and the natural frequency of the bridge when in normal vibration. Results of the vehicle loading test were used in the analysis. We compared the results by using our modeling with the result of the loading test and the hanger tension. Our prediction on the behavior of the structure emulates the behavior of the real structure. In applying the data measured by the typhoon "Maemi" which arrived in-land last year, we confirmed our analysis model for the possibility of applying effectively into the preliminary design and maintenance plan. 사회 기반 특수 시설로서 케이블을 이용한 현수교는 완공 후에 일반적인 교량 보다 더 신중한 안전점검 및 유지관리가 필요하다. 그러나, 교량의 설계 및 유지관리를 위한 구조해석은 구조체의 단순화된 기하학적 형상만을 고려하고 있다. 특히 강상판을 포함한 교량 구조물의 해석 모델링은 쉽지 않다. 본 논문에서는 완성계 현수교에 대한 행거 부재의 고유진동수와 전산해석을 통해 구조적 거동과 성능을 평가하였다. 전산해석의 정확도를 높이기 위해 해석 모델에 뼈대 구조물과 강상판을 고려하였다. 또한, 측정된 행거 장력과 상시 진동시에 측정된 구조물의 고유진동수 및 차량 재하시험 결과를 해석에 적용하였다. 결과로서, 제안된 알고리즘에 의한 예상 구조거동은 실제 구조물에서 측정된 자료와 매우 유사한 결과를 보였다. 또한, 내륙에 상륙한 태풍 매미에 의해 측정된 자료를 적용한 결과, 해석모델이 구조물의 예비설계 및 유지관리에 효과적으로 적용될 수 있음을 확인하였다.