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RISS 인기검색어
- 검색키워드
- 저자 : ( Deric John Oehlers ) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Oehlers, Deric John,Ahmed, Marfique,Nguyen, Ninh T.,Bradford, Mark Andrew Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.10 No.3
In a companion paper, tests on bolted side plated beams have shown that side plates can substantially increase the strength of existing reinforced concrete beams with little if any loss of ductility and, furthermore, induce a gradual mode of failure after commencement of concrete crushing. However, it was also shown that transverse interaction between the side plates and the reinforced concrete beam, that is vertical slip and which is a concept unique to side plated beams, is detrimental. Transverse interaction increases the forces on the bolt shear connectors and, hence, weakens the beam. It also reduces the ability of the composite plated beam to yield and, hence, to attain its full flexural capacity. The generic concept of transverse interaction will be described in this paper and the results used to develop a new form of rigid plastic analysis for bolted side plated beams which is illustrated with an application.
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( Deric John Oehlers ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
A very efficient form of retrofitting and rehabilitating existing reinforced concrete structures is to bond steel plates to their surfaces. External plating can be used to increase the shear strength, increase the flexural strength without a loss of ductility, reduce crack widths and reduce deflections. Comprehensive design rules are given for attaching steel plates to reinforced concrete beams by either adhesive bonding or bolting. It will be shown that adhesive bonding can fail prematurely and, hence, it is recommended that plates are always both bolted and adhesively bonded.
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Design for moment redistribution in FRP plated RC beams
Deric John Oehlers,Matthew Haskett,Mohamed Ali M.S. 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.6
Assessing the ductility of reinforced concrete sections and members has been a complex and intractable problem for many years. Given the complexity in estimating ductility, members are often designed specifically for strength whilst ductility is provided implicitly through the use of ductile steel reinforcing bars and by ensuring that concrete crushing provides the ultimate limit state. As such, the empirical hinge length and neutral axis depth approaches have been sufficient to estimate ductility and moment redistribution within the bounds of the test regimes from which they were derived. However, being empirical, these methods do not have a sound structural mechanics background and consequently have severe limitations when brittle materials are used and when concrete crushing may not occur. Structural mechanics based approaches to estimating rotational capacities and rotation requirements for given amounts of moment redistribution have shown that FRP plated reinforced concrete (RC) sections can have significant moment redistribution capacities. In this paper, the concept of moment redistribution in beams is explained and it is shown specifically how an existing RC member can be retrofitted with FRP plates for both strength and ductility requirements. Furthermore, it is also shown how ductility through moment redistribution can be used to maximise the increase in strength of a member. The concept of primary and secondary hinges is also introduced and it is shown how the response of the nonhinge region influences the redistribution capacity of the primary hinges, and that for maximum moment redistribution to occur the non-hinge region needs to remain elastic.
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Ahmed, Marfique,Oehlers, Deric John,Bradford, Mark Andrew Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.10 No.3
A procedure has been developed for bolting steel plates to the sides of existing reinforced concrete beams which can be used to increase the shear strength of beams, increase the flexural strength of beams with enhanced ductility or with only a small loss of ductility, and increase the stiffness of beams in order to reduce deflections and crack widths. It will be shown in this paper, through a qualitative analysis and through the results of testing eight large scale beams, that standard rigid plastic analysis techniques which are commonly used in the design of reinforced-concrete, steel, and composite steel and concrete beams cannot be used directly to design composite bolted-plated reinforced-concrete beams. In the companion paper, quantitative procedures will be used to adapt the standard rigid plastic analysis techniques for this relatively new form of retrofitting.
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