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RISS 인기검색어
- 검색키워드
- 저자 : Adenilcia F. G. Calenzani (검색결과 2 건)
- 무료
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Analytical study of composite steel‐concrete beams with external prestressing
Thiago T. Turini,Adenilcia F.G. Calenzani 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.5
Prestressed composite steel-concrete beams are still a technology restricted to repair sites of large-scale structures and spans. One of the reasons for that is the absence of standard frameworks and publications regarding their design and implementation. In addition, the primary normative codes do not address this subject directly, which might be related to a scarcity of papers indicating methods of design that would align the two technics, composite beams and external prestressing. In this context, this paper proposes methods to analyze the sizing of prestressed composite beams submitted to pre-tension and post-tension with a straight or polynomial layout cable. This inquiry inspected a hundred and twenty models of prestressed composite beams according to its prestressing technology and the eccentricity and value of the prestressing force. The evaluation also included the ratio between span and height of the steel profile, thickness and typology of the concrete slab, and layout of the prestressing cables. As for the results, it was observed that the eccentricity of the prestressing force doesn’t significantly influence the bending resistance. In prestressed composite beams subjected to a sagging moment, the ratio L/d can reach 35 and 30 for steel-concrete composite slabs and solid concrete slabs, respectively. Considering the negative bending moment resistance, the value of the L/d ratio must be less than or equal to 25, regardless of the type of slab. When it comes to the value of the prestressing force, a variation greater than 10% causes a 2.6% increase in the positive bending moment resistance and a 4% decrease in the negative bending moment resistance. The pre-tensioned composite beams showed a superior response to flexural-compression and excessive compression limit states than the post-tensioned ones.
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Dynamic Analysis of a Steel Floor System with Dry Slabs Subjected to Vibrations Due to Human Walking
Priscilla I. S. Ribeiro,André V. S. Gomes,Adenilcia F. G. Calenzani 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3
One of the contemporary architecture trends is the design of structural elements that cover longer clearances to provide fl exibility in the architecture of buildings. The technological and constructive evolutions in civil engineering assure the feasibility of such trends due to the use of structural elements with increased slenderness and reduced weight, such as steel structures that utilize dry slabs. However, structures of this type present greater susceptibility to the vibrations related to human activities. Hence, this study aims to evaluate, from the human comfort point of view, the dynamic behavior of an existing steel fl oor system with composite structural panels, subjected to vibrations due to human walking. To obtain the dynamic responses, the present study employs: (1) simplifi ed procedures of the AISC and SCI design guidelines and (2) modal and transient analyses performed to a numerical model developed using the ANSYS software. The dynamic responses were compared with human comfort criteria prescribed by design guides, ISO 10137:2007 and the Brazilian standards. The infl uence of the value taken for structural damping and eff ect of more than one walking individual simultaneously on the structure may be evaluated through numerical results. It was concluded that the simplifi ed procedures underestimate the dynamic responses of the fl oor system under study.
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