초록 ▼

· 일부타정식 사장교를 중앙경간 600-1000m에서 기존 사장교와 현수교 형식에 비해 경제성을 갖는 교량형식으로 개발하기 위해 연구를 수행함.

· 중앙경간 810m의 3경간 사장교를 개념 설계하여 타정케이블 개수에 따른 주요 부재의 구조 응답을 분석한 결과, 대상 교량에 대해 6쌍의 타정 케이블을 갖는 시스템이 최적으로 분석됨.

· 일부타정식 케이블 시스템은 공용 중과 시공 중 동하중에 대한 안전성을 확보해주는 방법으로 분석됨.

· 일부타정식 사장교의 시공방법으로 FCM과 온도활용 키세그먼트

· 일부타정식 사장교를 중앙경간 600-1000m에서 기존 사장교와 현수교 형식에 비해 경제성을 갖는 교량형식으로 개발하기 위해 연구를 수행함.

· 중앙경간 810m의 3경간 사장교를 개념 설계하여 타정케이블 개수에 따른 주요 부재의 구조 응답을 분석한 결과, 대상 교량에 대해 6쌍의 타정 케이블을 갖는 시스템이 최적으로 분석됨.

· 일부타정식 케이블 시스템은 공용 중과 시공 중 동하중에 대한 안전성을 확보해주는 방법으로 분석됨.

· 일부타정식 사장교의 시공방법으로 FCM과 온도활용 키세그먼트 폐합방법을 해석적으로 검증한 결과, 안전은 확보되나 온도 상승 과다로 작업성 저하됨.

· FCM 시공법과 변위제어 장치를 활용한 방법을 제안하여 시공 기술 개발함.
· 일부타정식 케이블 시스템 채용으로 자정식 사장교에 비해 거더 강재량 24% 감소, 주탑 콘크리트 물량 5% 감소, 케이블 1% 감소되는 것으로 분석됨.

· 대상 교량에 대한 개략공사비를 검토한 결과, 자정식에 비해 일부타정식 사장교의 공사비가 13.5% 감소되는 것으로 분석됨.

(출처 : 요약서 3p)

Abstract ▼

The structural effect of a partially earth-anchored cable-stayed bridge (PEACSB) developed by Gimsing was already verified. However, it is noted that there is little study on the detailed construction method for the PEACSB incorporated with economic feasibility. Even though the development of the pa

The structural effect of a partially earth-anchored cable-stayed bridge (PEACSB) developed by Gimsing was already verified. However, it is noted that there is little study on the detailed construction method for the PEACSB incorporated with economic feasibility. Even though the development of the partially earth-anchored cable system (PEACS) have been mainly focused on the cable-stayed bridge with the ultra long span length over 1,000 m, recent researches reveal that the PEACS can also be applied to cable-stayed bridges with main span lengths of between 300 m and 500 m constructed by the free cantilever construction method (FCM).

This project focuses on application of the PEACS to the cable-stayed bridges with main span lengths of between 600 m and 1000 m, where bridge engineers should select the optimal bridge type between cable-stayed bridges or suspension bridges after careful consideration. If the detailed technology for the construction of PEACSB is developed, which can overcome the problem in construction sequence, this type bridge can be dominant solution in this area. Thus, the object of this project is to investigate the optimal PEACS, develope detailed construction methods, and evaluate economical aspects of the PEACSB. Using results of this project, design engineers can design the special cable-stayed bridge while guaranteeing the safety and economical feasibility. Bridge contractors can have a predominant construction technology useful for finding oversea construction markets.

In order to investigate the response of partially earth-anchored cable-stayed bridges, a three-span cable-stayed bridge with a main span length of 810 m is designed preliminary. By investigating the structural behaviors of girders, pylons, cables through finite element (FE) model, the PEACS with six pairs of earth-anchored cables anchored to each abutment is selected as the optimal PEACS for the considered bridge. The selected PEACS can enhance the dynamic responses for seismic and wind loads both during and after construction. In operational phase, the peak moment of pylon is reduced by 47% and 70% for wind and seismic loads, respectively.

For the construction method of a PEACSB, the existing special erection method is not adequate for the considered PEACSB with main span lengths of between 600 m and 1000 m owing to the economic feasibility. This project evaluates two alternative methods. One is to use FCM method and thermal prestressing method in connecting key-segment. The other is to use FCM method and to install the special displacement control device, which constitutes reaction frames, hydraulic jacks, and supporting frames.

Since the method using the thermal prestressing method gives birth to residual stress in the system, the detailed construction sequence analysis is performed. The analysis results show that this method can guarantee the structural safety during the construction process. However, in the practical point, the heavy temperature rise is harmful for workers. Thus, the second method is recommended for connection the key-segment since this method do not occur residual stress while giving any hazard for work procedure.

To give economic advantages of PEACSB, the reduced material is calculated. The steel in the deck can be reduced by 24% and concrete of pylons can be reduced by 5%. For the stay cables, the amount of cables is reduced slightly. As a result of material decrement, the total construction cost can be approximately reduced by 13.5%.

(출처 : SUMMARY 11p)

목차 Contents

• 표지 ... 1
• 제출문 ... 2
• 보고서 요약서 ... 3
• 요약문 ... 4
• SUMMARY ... 11
• CONTENTS ... 13
• 목차 ... 14
• 제1장 연구개발과제 개요 ... 15
• 1.1 연구개발 필요성 및 목적 ... 15
• 1.2 연구개발의 정의, 범위, 특징 ... 22
• 1.3 관련분야의 국내외 기술개발 현황 ... 24
• 1.4 연구개발 결과의 우수성 및 차별성 ... 25
• 제2장 연구개발 수행 내용 및 결과 ... 27
• 2.1 연구개발 결과 요약 ... 27
• 2.2 연구개발 주요 내용 ... 35
• 제3장 최종 연구성과 및 적용실적 ... 96
• 제4장 연구목표 달성 및 효과 ... 98
• 4.1 질적 성과 목표 달성도 ... 98
• 4.2 양적 성과 목표 달성도 ... 99
• 4.3 기대효과 ... 99
• 제5장 연구성과의 활용 및 추가연구 필요성 ... 100
• 참고문헌 ... 100
• 끝페이지 ... 102