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횡하중 분포와 등가단자유도 방법의 영향을 고려한 다경간 교량의 내진성능 평가
송종걸,남왕현,정영화 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
To evaluate inelastic seismic responses of multi-span-bridge, the equivalent single-degree-of-freedom (ESDOF) methods and the lateral load distributions are applied to the capacity spectrum method(CSM). From the pushover analysis results using the four ESDOF methods and the six types lateral load distributions, the ESDOF method more than lateral load distribution is found to have an important influence upon the pushover analysis. The effects of the higher mode on the bridge seismic behaviors are also increased as the number of pier increase. Therefore, it can be concluded that lateral load distributions and ESDOF methods for reflection of higher mode effects should be considered in the seismic analysis of the bridge structural.
교량구조물의 비탄성변위응답 평가를 위한 연성도감소계수 산정식 제안
송종걸,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
The main objective of this study was to derive a formula of ductility reduction factor, expressed as R_(μ). To attain this objective, a study comprised reduction factors computed for stiffness degrading systems undergoing different levels of ductility and to investigate an accuracy of the formula. Based on this study, the main conclusions can be summarized :(1) The ductility reduction factor is primarily affected by the period of the system and the displacement ductility ratio. (2) The proposed formula is simpler and the inelastic deformations of bridge structures are better than those by the others formulas we used before.
교량구조물의 비탄성변위응답 평가를 위한 연성도감소계수 산정식 제안
송종걸,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
The main objective of this study was to derive a formula of ductility reduction factor, expressed as R_(μ). To attain this objective, a study comprised reduction factors computed for stiffness degrading systems undergoing different levels of ductility and to investigate an accuracy of the formula. Based on this study, the main conclusions can be summarized :(1) The ductility reduction factor is primarily affected by the period of the system and the displacement ductility ratio. (2) The proposed formula is simpler and the inelastic deformations of bridge structures are better than those by the others formulas we used before.
역량스펙트럼 방법을 이용한 철근 콘크리트 교각의 내진성능 평가
송종걸,장동휘,정영화 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A
To evaluate seismic performance of reinforced concrete piers two procedures for capacity spectrum method are presented. The capacity spectrum procedures include the reduction factor-ductility-period(R_(μ)-μ-T)relationship in order to construct the inelastic demand spectra from the elastic demand spectra. Application of the procedures are illustrated by example analysis. Maximum displacements estimated by the procedures are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the maximum displacements estimated by the procedures are, on overall, smaller than those by the inelastic time history analysis.
횡하중 분포와 등가단자유도 방법의 영향을 고려한 다경간 교량의 내진성능 평가
송종걸,남왕현,정영화 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
To evaluate inelastic seismic responses of multi-span-bridge, the equivalent single-degree-of-freedom (ESDOF) methods and the lateral load distributions are applied to the capacity spectrum spectrum method(CSM). From the pushover analysis results using the four ESDOF methods and the six types lateral load distributions, the ESDOF method more than lateral load distribution is found to have an important influence upon the pushover analysis. The effects of the higher mode on the bridge seismic behaviors are also increased as the number of pier increase. Therefore, it can be concluded that lateral load distributions and ESDOF methods for reflection of higher mode effects should be considered in the seismic analysis of the bridge structural.
송종걸,남왕현,정영화 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A
The capacity spectrum method(CSM) can be used for the evaluation of inelastic maximum response of structures and has been recently used in the seismic design using the incorporation of pushover analysis and response spectrum method. To efficiently evaluate seismic performance of multi-degree-of freedom(MDOF) bridge structures, it is important that the equivalent response of MDOF bridge structures should be calculated. To calculate the equivalent response of MDOF system, equivalent responses are obtained by using Song method, Fajfar method and Calvi method. Also, those responses are applied to CSM method and seismic performance of bridge according to the ESDOF method are compared and evaluated straightforwardly.
송종걸,남왕현,정영화 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A
To evaluate inelastic seismic reponses of multi-span bridge structures, the capacity spectrum method(CSM) incorporating the equivalent single-degree-of freedom(ESDOF) method is presented. Application of the CSM incorporating the ESDOF method is illustrated by example analysis for symmetric and asymmetric bridge structures. To investigate an accuracy of the CSM, the maximum displacements estimated by the CSM are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the CSM provided conservative estimates of the maximum displacements for the symmetric and asymmetric bridge structures, and the trend of conservative estimates of the asymmetric bridge structures was significantly larger than that of the symmetric bridge structure.
횡하중 분배방법을 이용한 교량구조물의 비탄성 변위응답 평가
송종걸,남왕현,정영화 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A
In order to evaluate seismic performance of multi-degree-of-freedom bridge structure, moderate lateral load distribution methods using the pushover analysis were developed by many researchers. One of important variables to improve an accuracy of pushover analysis is lateral load distribution. In this study, pushover analyses were performed using the five types of lateral load distribution and seismic performances were evaluated by capacity spectrum method (CSM). To verify an accuracy of suggested lateral load distribution, the maximum displacement estimates by the CSM were compared to those by inelastic time history analysis.
중연계 무선네트워크 환경의 도로유지관리계측 시스템 개발에 관한 연구
이상우,송종걸,남왕현,김학수 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
Wireless Sensor Networks provide a new paradigm for sensing and disseminating information from various environments, with the potential to serve many and diverse applications. Recent advancement in wireless communications and electronics has enabled the development of low-cost sensor networks. The sensor networks can be used for various application areas. For different application areas, there are different technical issues that researchers are currently resolving. The current state of the art of sensor networks is captured in this article, where solutions are discussed under their related protocol stack layer sections. This article also points out the open research issues and intends to spark new interests and developments in this field. In order to evaluate the application of field monitoring system, lab tests, field test and FEM analysis are conducted. Therefore the accuracy of RFID wireless sensor data is verified.
역량스펙트럼 방법과 수정변위계수법을 이용한 다경간 교량의 내진성능 평가
남왕현,송종걸,정영화 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
Capacity spectrum method(CSM) of ATC-40(1996) and displacement coefficient method(DCM)of FEMA-273(1997) are applied to evaluate the seismic performance of bridges, In this study, equivalent response is obtained from nonlinear static analysis for the 3spans continues bridge and nonlinear maximum displacement response is calculated using CSM and DCM. Nonlinear maximum displacement response of DCM is larger than this of CSM. It is method that DCM can evaluate target displacement and ductility of structural to be easy and simple, but tend to overestimate the maximum displacement response. Therefore, this method is mainly used at preparation design level to evaluate the structural response, It is not desirable to evaluate the seismic performance using DCM.