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有限要素法에 의한 콘크리트 構造物의 非線形解析에 관한 硏究(Ⅰ)
尹正培 慶尙大學校 1984 論文集 Vol.23 No.2
Nonlinear analysis of concrete structures is formulated and calculated by the finite element implementation. The incremental hypoelastic constitutive relationship for uncracked plain concrete is used and the variation of material modulus by the application of proportional load is only considered. The combined method for nonlinear solution is illustrated and the results is finally compared with the experimental data from biaxial loading. This material model gives a good match with the experimental results under the intermediate stress level.
콘크리트 構造物의 非線型 有限要素解析을 위한 개선된 解析方法에 관한硏究
尹正培 慶尙大學校 1985 論文集 Vol.24 No.2
'Nonlinear finite element method by improved solution procedure for modified Newton-Raphson type solution is implemented. Hypo-elastic material model, using equivalent uniaxial concept, is adopted. Current stiffness Parameter is included in solution algorithm and the load is incremented automatically by this parameter. This procedure apply to biaxial loaded condition. The results gives general similarities for experimental values through over-all portion of stress-strain curves. Further researches are needed for strain-softening modelling of stress-strain curve.
N2 Method를 이용한 RC 중간모멘트 연성골조의 반응수정계수 및 내진성능 평가
윤정배,이철호,최정욱,송진규 한국지진공학회 2002 한국지진공학회논문집 Vol.6 No.6
반응수정계수는 구조물의 비탄성 거동을 설계에 반영하고 설계지진력 산정시 설계강도를 탄성범위 이내로 저감시키기 위한 목적으로 사용하고 있다. 그러나 설계코드에서 채택하고 있는 반응수정계수는 과거의 지진피해로부터 관찰된 보편적 구조성능에 기인한 경험치이므로, 주기에 따른 동적성능과 구조 시스템의 구성에 따른 내진성능을 정확히 대변하지 못하고 있다. 본 연구에서는 중간모멘트 연성골조를 대상으로 N2 Method를 이용하여 반응수정계수와 내진성능을 평가하였으며, 그 결과를 미국의 IBC 2000 코드와 비교하여 이론적 타당성을 검증하였다. 해석결과 코드에 제시된 반응수정계수와 잘 부합되는 것으로 나타났으나, 동일한 구조시스템의 경우에도 주기에 따라 비교적 큰 차이를 보였다. 성능목표에 따른 사용성 기준을 설정하여 IDI를 평가한 결과, 설계지진에 대한 성능목표가 건물에 대한 내진성능을 대변하기는 어려우며 PBD(Performance Based Design)에 의거한 합리적인 접근이 필요한 것으로 판단된다. Response Modification Factor(R-factor) approach is currently implemented to reflect inelastic ductile behavior of the structures and to reduce elastic spectral demands from earthquakes to the design level. However R factors were set empirically and simply based on the professional committee consensus on observed performance of building structures during past earthquakes. Consequently some major shortcomings linked to the current R factor approach have been pointed out. Using reinforced concrete intermediate moment-resisting frames(RC IMRFs), an analytical procedure is presented in this paper to establish R factor rationally. To this end, analytical R values were evaluated based on N2 Method and compared with the values recommended by IBC 2000. Overall, the analytical results correlated well with the code values. However the results also revealed that R factor might strongly depend on the system fundamental period. As evidenced by the interstory drift index(IDI) analysis results of this study, current R-factor based(or, Life Safety based) design tends to fail in fulfilling other implicit and hopeful performance objectives such as immediate Occupancy and Collapse Prevention. Performance based design(PBD) appears to be a promising approach to meet the multi level seismic performance objectives assigned to the building structures of nowadays.
윤정배 慶尙大學校生産技術硏究所 1989 生産技術硏究所論文集 Vol.5 No.-
An analytical investigation of the various test results for the representation of flexural hysteretic behavior in the R/C ductile frames under cyclic load is described. The proposed hysteretic model included the softening in the compression failure as well as flexural hardening after steel yields. Finally, various parametric considerations including numerical instabilities affecting proposed model are discussed.
보-기둥 접합부의 이력거동을 고려한 RC 평면골조의 내진해석
조용부,김영곤,우종열,윤정배 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-
The analytical studies from the test results are presented. From experimental envelope curve, hysteretic behaviors under cyclic loading are modeled for beam-column subassemblages. Modelled curves show relatively good reproduction for experimental curves. Finally, seismic performances are investigated for 7 story plain framed structure by nonlinear dynamic analysis. The resulting responses are different by each beam-column joint design.