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송재필,이우현,김기봉 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2
In this study, a method of increasement the capacity of existing simple span composite bridges, is developed using the post-tensioning. The distribution of post-tension force and flexural moment as well as feasibility increasing flexural capacity of simple span composite bridges are shown by numerical examples.
송재필,김기봉,정인근,김현호 中央大學校 建設環境硏究所 2002 環境科學硏究 Vol.13 No.2
무인궤도운전열차(Automated Guide-way Transit, AGT) 시스템의 접지력 및 교량-차량의 동적 응답을 구하기 위해 노면조도가 있는 주행로를 운행하는 AGT 시스템에 대한 동적 운동방정식을 유도하였다. AGT 시스템의 차량은 3차원 11 자유도 모델로 이상화하였고, 교량은 3차원 프레임 모델로 단순화하였다. 동적 운동방정식의 해를 구하기 위하여 컴퓨터 프로그램을 개발하였고, 해석된 결과는 실험자료의 결과치와 비교 분석하였다. 본 연구에서 개발된 프로그램의 해석결과 AGT 교량, 차량 그리고 노면요철의 상호 작용에 의한 교량과 차량의 동적 응답을 구하여 정밀한 교량의 동적증가계수를 산정할 수 있었다. The equations of motion for an automated guide-way transit(AGT) system running on a path with roughness have been derived to investigate dynamic responses and wheel loads of moving vehicles of the AGT system. A vehicle of the AGT system is idealized as three-dimensional model with 11 degree-of-freedom, and a bridge is modelized with three F.E. method. The computer program is developed to solve the dynamic equations, and analytical results are verified by comparing the results with experimental ones. As a result, the computer program which developed in this study can be used for estimate the dynamic responses of bridge and vehicle due to dynamic interaction of bridge, vehicle and surface roughness, and with these results the dynamic increment factor of bridge can be obtained.
TYFO를 이용한 R.C. 슬래브 보강기법에 관한 연구
김기봉,정영수,송재필 中央大學校 建設環境硏究所 1997 環境科學硏究 Vol.8 No.-
Recently, glassfibers have been used for strengthening in aged RC bridge slabs because of low material cost and easy repairing work. The purpose of this study is to experimentally and analytically investigate the effect of glassfibers for enhancing the capacity of aged RC bridge slabs. The Result shows that yield and ultimate strength of RC slabs with glassfibers are increased as 11~18% and 25~35% comparing with those for RC slabs without strengthening, respectively. Also, ductility of RC slabs strengthened with glassfibers have been significantly increased. Futher tests have been performing on aged RC bridge slabs strengthened with carbon fiber stripes.
후긴장을 이용한 단순 합성 격차형교의 보강 방법에 관한 연구
김기봉,송재필 中央大學校 建設環境硏究所 1996 環境科學硏究 Vol.7 No.-
Bridges are designed according to the some kinds of design specifications that are current at the time of design. The design specifications are revised on a regular schedule, and changes are often on the direction of more stringent design standards. And, legal truck loads are increased, and the amount of traffic is increased. Therefore many bridges, that are built in few decades are ago, are needed strengthening. Add on that, deterioration due to lake of maintenance increase the needs of strengthening. One method of strengthening bridges is post-tensioning. In this study, a method of increasement the capacity of existing simple span composite bridges, is developed using post-tensioning. The distribution of post-tensioning force and moment as well as feasibility increasing flexural capacity of simple span composite bridges are shown by numerical examples.