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LRFD법으로 설계된 단경간 및 연속경간 강합성 플레이트 거더 및 박스 거더의 휨에 대한 신뢰도해석
신동구,노준식,조은영,Shin, Dong Ku,Roh, Joon Sik,Cho, Eun Young 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.1
국내 LRFD 도로교설계규정을 정립하기 위한 자료로 활용하기 위하여 단경간 및 3경간 연속 플레이트 거더 및 박스 거더 합성단면을 하중저항계수설계법으로 설계하고 설계된 단면의 휨에 대한 신뢰도해석을 수행하였다. LRFD 법에 의한 합성거더 단면 설계 시에는 최근 국내 통행차량의 특성을 분석하여 새로 제안된 활하중을 적용하였다. 신뢰도해석에서 휨저항강도는 최근 국내에서 생산된 16,000여 구조용 강재 표본의 항복강도 통계적 특성을 반영하여 재료 비선형 소성해석으로 구한 강합성단면의 휨저항강도 통계를 이용하였다. 활하중에 의한 작용모멘트의 편심계수는 1.0~1.2를 적용하였으며 강거더 자중, 콘크리트 바닥판 자중, 포장면 자중 등에 의한 고정하중 모멘트 통계 값은 A SHTO 보정자료를 사용하였다. Rackwitz-Fiessler 법으로 신뢰도해석을 수행하고 지간별, 강거더 형식별, 활하중계수별, 활하중 모멘트의 편심계수별로 신뢰도지수 계산 결과를 제시하였다. The reliability analysis of simply-supported and continuous composite plate girder and box girder bridges under flexure was performed to provide a basic data for the development of LRFD c ode. The bridges were designed based on LRFD specification with newly proposed design live load which was developed by analyzing traffic statistics from highways and local roads. A performance function for flexural failure was expressed as a function of the flexural resistance of composite section and the design moments due to permanent load and live load. For the flexural resistance, the statistical parameters obtained by analyzing over 16,000 domestic structural steel samples were used. Several different values of bias factors for the live load moment from 1.0 to 1.2 were used. Due to the lack of available domestic measured data on the moment by permanent loads, the same statistical properties used in the calibration of ASHTO-LRFD were ap plied. The reliability indices for the composite girder bridges with various span lengths, different live load factors, and bias fact or for the live load were obtained by applying the Rackwitz-Fiessler technique.
국내 생산 강재를 적용한 강합성 거더 휨저항강도의 통계적 특성
신동구,김천용,노준식,박영석,Shin, Dong Ku,Kim, Chun Yong,Rho, Joon Sik,Park, Young Suk 한국강구조학회 2007 韓國鋼構造學會 論文集 Vol.19 No.2
국내 LRFD 도로교설계규정의 휨에 대한 재료 저항계수 정립 시 기초 통계자료로 활용하기 위하여 국산 강재를 적용한 강합성 플레이트 거더 단면의 정모멘트 및 부모멘트 하 휨저항강도를 통계적으로 분석하였다. 최근 국내에서 생산된 16,000여 표본의 구조용 강재와 철근에 대한 항복강도와 인장강도 등의 기계적 특성을 통계적으로 분석하여, 공칭강도에 대한 편심계수(bias factor)와 변동계수(coefficient of variation)를 구하였다. 이들 국산 강재와 철근을 적용하여 정 부모멘트를 받는 도로교 강합성 플레이트 거더교 대표단면에 대한 재료 비선형 소성해석을 수행하였으며, 해석결과로부터 모멘트-곡률 곡선을 구하고 단면의 휨저항강도를 산정하였다. 공칭휨강도와 극한휨저항강도를 비교하고 대표적 강합성 단면에 대한 편심계수와 변동계수 통계치를 제시하였다. The objective of the present study is to provide statistical resistance statistics for steel-concrete composite plate girder sections under positive and negative moments. Statistical properties on yield strength, tensile strength, elongation, and fracture toughness of domestic structural steel products, gathered from an analysis of over 16,000 samples, were evaluated. Using the steel samples for the plate girder, the bias factor and the coefficient of variation of the ultimate flexural resistance for representative composite plate girder sections under positive and negative flexures were presented. In calculating the ultimate flexural resistance of the composite section, the moment curvature relationships were developed using the incremental load approach considering material nonlinearity for the steel girder. The predicted statistics can be used in the future for the efficient calibration of LRFD code.
일축 압축력 및 균일분포 열 하중하 대칭적층된 유사 등방성 및 직교 이방성 직사각형 복합재 평판의 후 좌굴 파괴경계선
신동구(Dong Ku Shin) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.4
The postbuckling failure characteristics of symmetrically laminated simply supported rectangular plates under combined uniform thermal load and uniaxial edge compression are investigated. The nonlinear postbuckling analysis is performed by the finite element method based on the first order shear deformable plate theory with the use of von Karman type nonlinear strains. The postbuckling strength is predicted by Tsai-Wu failure theory. Several numerical examples for quasi-isotropic and cross-ply laminated plates with various width-to-thickness ratios are presented. The failure space is defined by normalized axial compression and temperature change and failure envelops are obtained in the failure space. From the failure envelops obtained, it is found that the normalized axial compression and the temperature increase are in a linear relationship. It is also found that the slopes of failure envelops are almost identical regardless of the width-to-thickness ratios of plates with the same stacking sequences.
신동구 ( Shin Dong-gu ),권우택 ( Kwon Woo-teck ),김병익 ( Kim Byun-ik ),김수룡 ( Kim Soo-ryong ),하상욱 ( Ha Sang-wook ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Recently the generation of industrial byproducts has been increased by increase of consumption of electric power. One of the significant byproducts need huge amount of re-utilization is known as bottom ash and many studies to find out appropriate application have been performed and reported. In this work, the physical properties of bottom ash generated from power plant are analyzed. Characteristic mortar property for building material were investigated with content of added bottom ash and various lightweight aggregates. According to the analytic result of 22.5% of bottom ash with 5% of Expan cel, chemical compositions of bottom ash is similar to those of fly ash and compressive strength after 7days related to pozzolanic activity shows 19.6N/cm2.
열 기계적 하중하 단순 지지된 직사각형 스테인리스 강 평판의 후 좌굴 해석 및 항복거동
신동구(Dong Ku Shin) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.1
The postbuckling yield behavior of simply supported rectangular stainless steel plates under combined action of uniform thermal load and uniaxial edge compression are investigated. The nonlinear postbuckling analysis is performed by the finite element method based on the first order shear deformable plate theory with the use of von Karman type nonlinear strains. Yielding of plates at thermomechanical postbuckling load range is predicted by von Mises yield criterion. Several numerical examples for plates with various width-to-thickness and aspect ratios are considered. The yield space is defined by normalized axial compression and temperature change. The yield curves that indicate the load carrying capability of plates without yielding are obtained in the yield space defined. From numerical examples considered, it is found that the shapes of yield curves for the plates with the same aspect ratios are very similar between them regardless of the width-to-thickness ratios of plates. It is also observed that slopes of the yield curves are less steeper as the plate aspect ratio increases, implying that a plate with high aspect ratio has greater thermal buckling strength compared with the postbuckling strength under compressive load.
신동구(donggu Shin),김재수(J.S.Kim),윤정모(J.M.Yoon),권이남(Y.N.Kwon),전성진(S.J.Jhun),정택영(T.Y.Chung) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
인터넷의 발달로 디지털콘텐츠의 생성과 활용이 급격히 증가하면서 디지털콘텐츠에 대한 서비스 방식이 URL 방식에서 URN 방식으로 변화하고 있다. 한국과학기술정보연구원의 KOI나 한국전산원의 UCI가 그 예라고 할 수 있다. 그러나 식별체계 간의 등록 · 변환서비스가 호환되지 않기 때문에 식별체계를 활용하여 디지털콘텐츠를 서비스하기 위해서는 커널메타데이터를 각각 등록하여야 하며, 디지털콘텐츠 변환서비스도 서로 연계가 이루어 지지 않기 때문에 개별적으로 서비스 되고 있다. 디지털콘텐츠를 보다 효율적으로 생성 · 활용하기 위하여 식별체계 간의 등록 · 변환서비스 연계가 가능한 식별체계 간 연계시스템 구축 방안을 제시하고자 한다.
신동구(Shin, Dong-Gu),정재운(Jeong, Jae-Woon,),김성수(Sung-Soo),이정배(Lee, Jeong-Bae),박광필(Park, Kwang-Pil) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
This study deals with the bond strength between the repair material and the substrate according to bonding method and curing condition. From the test results, 28 aged specimens appling none, Acrylic bonding agents and the bonding pin shows high bonding strength in Bonding Pin〉None〉Acrylic bonding agents order in the standard condition but in Bonding Pin〉Acrylic bonding agents 〉none order in the wet condition. each bond strength of 224 aged specimens appeared highly in Bonding Pin〉None〉Acrylic bonding agents order in the standard condition and wet condition.