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RISS 인기검색어
- 검색키워드
- 저자 : Zanuy, (검색결과 4 건)
- 무료
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- 유료
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Investigating the negative tension stiffening effect of reinforced concrete
Zanuy, Carlos Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.2
The behaviour of a reinforced concrete tension member is governed by the contribution of concrete between cracks, tension stiffening effect. Under highly repeated loading, this contribution is progressively reduced and the member response approximates that given by the fully cracked member. When focusing on the unloaded state, experiments show deformations larger than those of the naked reinforcement. This has been referred to as negative tension stiffening and is due to the fact that concrete carries compressive stresses along the crack spacing, even thought the tie is subjected to an external tensile force. In this paper a cycle-dependent approach is presented to reproduce the behaviour of the axially loaded tension member, paying attention to the negative tension stiffening contribution. The interaction of cyclic bond degradation and time-dependent effects of concrete is investigated. Finally, some practical diagrams are given to account for the negative tension stiffening effect in reinforced concrete elements.
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Analytical Equations for Interfacial Stresses of Composite Beams Due to Shrinkage
Carlos Zanuy 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.4
Long term effects due to shrinkage may lead to deformations in steel-concrete composite members that are to be taken into account in the verification of the in-service condition. Simultaneously, tangential and normal stresses develop at the connection between concrete and steel and they can result in uplift effects, especially in end regions. In this paper, an analytical model is presented and closed-form solutions are derived in order to quantify deflections of composite members with partial interaction, as well as stresses and relative displacements at the connection. It is shown that deflections and tangential stresses/ slips can be properly obtained if equal curvatures between the components of the composite member are assumed. Nevertheless, such a hypothesis must be abandoned in order to reproduce uplift effects at the interface and a new model is presented to derive the distribution of normal stresses.
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Investigating the negative tension stiffening effect of reinforced concrete
Carlos Zanuy 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.2
The behaviour of a reinforced concrete tension member is governed by the contribution of concrete between cracks, tension stiffening effect. Under highly repeated loading, this contribution is progressively reduced and the member response approximates that given by the fully cracked member. When focusing on the unloaded state, experiments show deformations larger than those of the naked reinforcement. This has been referred to as negative tension stiffening and is due to the fact that concrete carries compressive stresses along the crack spacing, even thought the tie is subjected to an external tensile force. In this paper a cycle-dependent approach is presented to reproduce the behaviour of the axially loaded tension member, paying attention to the negative tension stiffening contribution. The interaction of cyclic bond degradation and time-dependent effects of concrete is investigated. Finally, some practical diagrams are given to account for the negative tension stiffening effect in reinforced concrete elements.
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Tension Chord Model and Flexural Stiff ness for Circular CFST in Bending
Carlos Zanuy 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.1
The fl exural behavior of circular concrete-fi lled steel tubes (CFST) is addressed in the present paper, with the aim of understanding the contribution of the concrete infi ll and the steel tube to the fl exural stiff ness under in-service loads. The provisions given by current codes of practice are oversimplifi ed and they result in a very diff erent contribution of the concrete infi ll from one code to another. In the present paper, a mechanical approach is proposed by taking into account the stress transfer mechanism from the steel to the concrete through bond stresses. The paper fi rstly addresses the response of the cracked section in pure bending. Secondly, a tension chord model for CFST is proposed, so that the contribution of concrete in tension between cracks (tension stiff ening) can be evaluated. The model capabilities are compared with experimental results from the scientifi c literature and with own experimental results of the author, showing that the proposed approach can predict the fl exural stiff ness of CFST very satisfactorily. For the fi rst time, a model with sound mechanical background is introduced to calculate the bending stiff ness of CFST.
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