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송하원(Ha-Won Song),백승우(Seung-Woo Pack),이현정(Hyun-Jung Lee),이선호(Son-Ho Lee) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Durability design as well as service life prediction of RC structures is critical for sustainable development of railroad concrete structures in marine environment. In order to predict the service life of reinforced concrete structures subjected to chloride attack, it is necessary to develop an analytical approach to predict the time and space dependent analysis on chloride penetration of concrete structures up to the durability limit state, which is defined conservatively as a time for the corrosion initiation, i.e., the time to reach the critical chloride threshold value at the surface of the rebar in reinforced concrete structures. In this paper, a performance-based durability design method is introduced for marine concrete structures subjected to chloride attack. By using the design method, a service life design is carried out for reinforced concrete bridges exposed to marine environment. Then, a deterioration analysis due to chloride attack for service life prediction of reinforced concrete structures is also carried out. Finally, current durability design method for marine concrete structures specified in current railroad design code is analyzed. The analysis shows that correct parameters like surface chloride concentration for the seashore in Korea and chloride threshold level are necessary for accurate durability design.
시간의존성을 고려한 해안가 철도 콘크리트 구조물에 대한 내구성 설계 기법의 개발
송하원(Ha-Won Song),백승우(Seung-Woo Pack),이선호(Son-Ho Lee),권진수(Jin-Su Kwen),이현정(Hyun-Jung Lee) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper presents a refined design model for current railroad design code on concrete structures exposed to marine environment. A time-varying diffusion coefficient(D) as well as surface chloride(C<SUB>s</SUB>) and chloride threshold level(C<SUB>lim</SUB>) are studied. Averaging value of the D with time over exposed duration were used to refined durability design model to consider time dependent characteristic of D. The values for C<SUB>s</SUB> and C<SUB>lim</SUB> for the seashore in Korea revised for realistic durability design. The proposed model was verified by the so-called performance-based durability design, which is widely used in recent durability design code. Results show that the current standard specification underestimates durability performances of concrete structures exposed to marine environment, so that the cover depth design using current durability evaluation in the standard specifications is very much conservative. Thus, it is found that proposed durability design models for the railroad design code for railway concrete structures can be used effectively for service life design of concrete structures in marine environment.