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RISS 인기검색어
- 검색키워드
- 저자 : Majid Barghian (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Retrofitting of steel pile-abutment connections of integral bridges using CFRP
Seyed Saeed Mirrezaei,Majid Barghian,Hossein Ghaffarzadeh,Masood Farzam 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.2
Integral bridges are typically designed with flexible foundations that include one row of piles. The construction of integral bridges solves difficulties due to the maintenance of expansion joints and bearings during serviceability. It causes integral bridges to become more economic comparing with conventional bridges. Research has been focused not only to enhance the seismic performance of newly designed bridges, but also to develop retrofit strategies for existing ones. The local performance of the pile to abutment connection will have a major effect on the performance of the structure and the embedment length of pile inside the abutment has a key role to provide shear and flexural resistance of pile-abutment connections. In this paper, a simple method was developed to estimate the initial value of embedment length of the pile for retrofitting of specimens. Four specimens of pile-abutment connections were constructed with different embedment lengths of pile inside the abutment to evaluate their performances. The results of the experimentation in conjunction with numerical and analytical studies showed that retrofitting pile-abutment connections with CFRP wraps increased the strength of the connection up to 86%. Also, designed connections with the proposed method had sufficient resistance against lateral load.
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Investigation of the Progressive Collapse in a Suspension Bridge Under the Explosive Load
Salar Farahmand-Tabar,Majid Barghian,Majid Vahabzadeh 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
Progressive collapse is a continuous spread of initial local failure from one member to another one, fi nally causing the collapse of the structure entirely or a disproportionately large part of it. This disproportionate collapse is due to the small initial local failure induced by unpredicted attacks, exhibiting that the structural system cannot resist the development of damage due to the insuffi cient load carrying capacity. In this study, a typical suspension bridge was modeled and analyzed under explosion load. For this purpose, diff erent scenarios were investigated. Forces and moments of the superstructure, responses and the stability of the structure under the applied loads were studied. Explosion applied on the structure depends on the amount of the load and local eff ects. Also, by removing one or several elements of structures, the force is distributed in the whole structure. For loading rate on diff erent positions of the structure, it was observed that the critical position would be under the explosion and towers adjacent. Towers adjacent and the middle of the deck were prone to the maximum infl uences where should be put more attention on and be reinforced to preserve the structure from the total and local failure.
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