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Seismic behavior of connections between steel and concrete

Title: Seismic behavior of connections between steel and concrete
Author(s): J.O. Jirsa
Paper category : conference
Book title: International Symposium on Connections between Steel and Concrete
Editor(s): R. Eligehausen
Print-ISBN: 2-912143-25-X
e-ISBN: 2351580346
Publisher: RILEM Publications SARL
Publication year: 2001
Pages: 479 - 480
Total Pages: 2
Language: English

Abstract: The poor performance of many structures in recent earthquakes has resulted in the development of an important new area of structural design - the repair and strengthening of structures. The designer is often faced with meeting conditions that do not need to be considered in the design of new structures. These may include:
- performance required by the owner or occupant may not be well defined
- the condition of the structure must be assessed if there has been earthquake or other damage to the system
- construction options may be limited by the need to maintain occupancy or to avoid interference with neighboring structures
- time to completion may a prime factor
- modifications to the structure must not lead to new zones of weakness or create operational problems in the use of the structure
For concrete structures, these constraints often lead to the selection of steel elements to achieve the changes needed for meeting the performance requirements of the rehabilitated structure.
Steel elements attached to concrete require connections between the two materials that will permit the modified element to reach desired strength, deform sufficiently to allow inelastic response of the element and/or structure, and be constructed economically.
Because concrete and steel have very different stiffness characteristics, it is imperative that the designer consider those differences in evaluating local, as well as global response of the rehabilitated element or structure.

The purpose of the paper is to identify several rehabilitation systems that involve the use of steel attached to concrete:
- addition of steel bracing to concrete frames that have low lateral capacity and/or ductility
- jacketing of elements to improve shear capacity or confinement in columns or beams that have inadequate confinement or splice details
- addition of steel straps to provide additional tension capacity in beams or to transfer shear forces between elements.
In each case, the connection between the concrete and the steel must be carefully detailed to ensure that the desired performance is achieved. Slip between the steel element and the concrete must be minimized. Anchors used for connecting steel elements to the concrete must be anchored adequately and the shear stiffness and strength of the connector must be evaluated.
In the presentation, the use of various strengthening techniques will be described using field examples. Laboratory tests used to assess the performance of the strengthening elements and to provide design guidance will be discussed.

Online publication: 2009-12-31
Publication type : full_text
Public price (Euros): 0.00

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