Ductile Seismic Retrofit of Steel Deck-Truss Bridges. II: Design Applications

Sarraf, Majid; Bruneau, Michel

doi:10.1061/(asce)0733-9445(1998)124:11(1263)

Cited by 22 publications

(5 citation statements)

References 4 publications

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“…This upgrading concept is similar to the works by previous investigators [15][16][17] on the point of replacing lateral bracings for ductile energy-dissipating members to mitigate seismic damage to other parts of the structure. Ductile panels were used to replace the end-frame and the lower lateral braced panels for seismic retroÿtting of steel deck-truss bridges and the design procedure for the panels has been presented [15,16]. In the following work [17], ductile end-diaphragms were adopted for seismic retroÿt of slab-ongirder steel bridges.…”

Section: Introductionsupporting

confidence: 56%

A seismic upgrading method for steel arch bridges using buckling‐restrained braces

Usami

2005

Earthq Engng Struct Dyn

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SUMMARYIn this study the employment of buckling-restrained braces (BRBs) as energy dissipation dampers is attempted for seismic performance upgrading of steel arch bridges and the e ectiveness of BRBs to protect structures against strong earthquakes is numerically studied. With buckling restrained, BRB members can provide stable energy dissipation capacity and thus damage of the whole structure under major earthquakes can be mitigated. Cyclic behaviour of such members is addressed with a numerical simulation model, and a strength design method for BRBs is proposed. BRBs are then placed at certain locations on the example steel arch bridge to replace some normal members with two schemes, and the e ect of the two installation schemes of BRBs for seismic upgrading is investigated by non-linear time-history analyses under various ground motions representing major earthquake events. Compared with the seismic behaviour of the original structure without BRBs, satisfactory seismic performance is seen in the upgraded models, which clariÿes the e ectiveness of the proposed upgrading method and it can serve as an e cient solution for earthquake-resistant new designs and retroÿt of existing steel arch bridges.

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Section: Introductionsupporting

confidence: 56%

A seismic upgrading method for steel arch bridges using buckling‐restrained braces

Usami

2005

Earthq Engng Struct Dyn

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“…The use of such diaphragms has been proposed as a seismic retrofit strategy in recent years, and detailed design procedures have been developed for that purpose (Sarraf and Bruneau 1998;Zahrai and Bruneau 1999). The objective of this strategy is to control seismic response in the transverse direction of the bridge by having a ductile fuse in the structure along the earthquake load path to protect, wherever possible, the superstructure and substructure from excessive loads.…”

Section: Numerical Examplementioning

confidence: 99%

“…In some instances, as demonstrated in this paper, superstructure flexibility can significantly increase the ductility demand imposed on bridge piers. Likewise, support (substructure) flexibility can increase ductility demands in special types of end-diaphragms, designed to exhibit ductile behavior and dissipate energy during earthquakes, that have been proposed for slab-on-girder (Zahrai and Bruneau 1999) or deck-truss (Sarraf and Bruneau 1998) steel bridges. In a general sense, any bridge component (piers, bearings, diaphragms, etc.)…”

Section: Introductionmentioning

confidence: 99%

Local versus Global Ductility Demands in Simple Bridges

Alfawakhiri

Bruneau

2001

J. Struct. Eng.

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1061/(ASCE) 0733-9445(2001)127:5(554) Journal of Structural Engineering, 127, 5, pp. 554-560, 2001-05-01 Local versus global ductility demands in simple bridges Alfawakhiri, F.; Bruneau, M. Local Versus Global Ductility Demands in Simple BridgesBy Farid Alfawakhiri 1 and Michel Bruneau, 2 Member, ASCE Abstract : This paper addresses the inelastic dynamic response of simply supported bridges to ground motion in their transverse direction. The effect of the relative substructure-superstructure flexibility on the inelastic response of bridges is studied for symmetric spans. The bridges are modeled as beams with distributed mass and elasticity, simply supported at the ends by elasto-plastic springs. An analytical extension of the common generalized single degree of freedom model into the inelastic range is presented. Flexibility of the capacity-protected structural elements is shown to add significantly to the ductility demand of the energy dissipating components of bridge systems. A simple method is developed to account for these flexibilities when assessing bridge response beyond its elastic range. Numerical case studies are presented to illustrate the new analytical tool.

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“…Performance-based design is one of the new areas of research that has received significant attention in recent years (Sarraf and Bruneau, 1998;Song and Ellingwood, 2001;Sakurai et al, 2001). According to Ghobarah (2001), conventional design criteria are defined by limits on stresses and member forces calculated from prescribed levels of applied lateral shear force, while the idea of performance-based design is to develop design criteria in order to achieve stated performance objectives when the structure is subjected to stated levels of earthquake hazard.…”

Section: Introductionmentioning

confidence: 99%

Energy‐based design of structures using modified force analogy method

Wong

Wang

2003

Structural Design Tall Build

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Energy due to earthquake excitations is used to evaluate the performance of a structure. This energy is derived analytically based on the force analogy method, which uses only initial stiffness with changing displacement to accurately capture the inelastic material behaviour. However, numerical calculation using the classical force analogy method considers mass matrices that are invertible, and therefore it is not appropriate for use in analysing real structures where rotational mass moment of inertia is generally ignored. In this research, derivation of the force analogy method is modified to analyse real moment-resisting frames using static condensation. Using this modified force analogy method in the condensed form significantly reduces the size of the structural problem because a large number of rotational degrees of freedom can be condensed. Numerical simulation is then performed to analyse the dynamic response of a six-storey moment-resisting frame and the concept of performancebased design is used to improve the structural performance in terms of energy dissipation 'demand' at each plastic hinge. Results show that the amount of total plastic energy dissipation remains about the same for structures with similar frequency contents. This is significant because it shows that understanding the flow of energy in the structure is important in improving structural performance under earthquake excitations.

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Ductile Seismic Retrofit of Steel Deck-Truss Bridges. II: Design Applications

Cited by 22 publications

References 4 publications

A seismic upgrading method for steel arch bridges using buckling‐restrained braces

A seismic upgrading method for steel arch bridges using buckling‐restrained braces

Local versus Global Ductility Demands in Simple Bridges

Energy‐based design of structures using modified force analogy method

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