Damage states and fragility functions for link beams in eccentrically braced frames

Gulec, C. Kerem; Gibbons, Bruce; Chen, Albert; Whittaker, Andrew S.

doi:10.1016/j.jcsr.2011.03.014

Cited by 33 publications

(17 citation statements)

References 6 publications

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“…Although damage states have not been applied to stream channels, they are frequently used to describe threshold levels of damage to complex systems that have undergone high loading events (Gulec et al, 2011). For example, bridge damage states describe visible damage to bridge components, such as the abutment, shear keys, deck, and columns (ODOT, 2009).…”

Section: Development Of a Damage States Frameworkmentioning

confidence: 99%

Describing Damage to Stream Modification Projects in Constrained Settings

Jones

Johnson

2014

J American Water Resour Assoc

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Complex relationships between stream functions and processes make evaluation of stream modification projects difficult. Informed by vague objectives and minimal monitoring data, post-construction project evaluations can often be a subjective attribution of success or failure. This article provides a simple framework to rapidly describe the degree of damage in stream modification projects performed in constrained settings. Based on widely accepted evaluations of physical habitat quality and stream stability, the damage states framework describes a continuum of damage in multiple categories that relate natural stream functions to the often desired state of static equilibrium. Given that channel form is closely related to stream function, it follows that changes to the channel form result in changes in function. The damage states focus on damage to flow hydraulics, sediment transport and channel equilibrium, hydraulic, and geomorphic parameters that describe basic stream functioning and support higher level functions in the modified channel. The damage states can be used in decision making as a systematic method to determine the need for repair and design adjustments.

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Section: Development Of a Damage States Frameworkmentioning

confidence: 99%

Describing Damage to Stream Modification Projects in Constrained Settings

Jones

Johnson

2014

J American Water Resour Assoc

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“…Moreover, particular care has been taken in modelling the link element. Similarly to the case of push-over analyses, the concept of equivalent plastic moment has been adopted in plastic hinge definition assuming, for short links, an ultimate plastic rotation equal to ±0.09 rad [4,[6][7]. Elastic shear and flexural deformations are already included due to the beamcolumn element representing the actual link member, so that the adoption of a rigid-hardening behaviour for the plastic hinge is fully justified.…”

Section: Incremental Dynamic Analysesmentioning

confidence: 99%

“…the dissipative capacity of the structure. It is well known that, under this point of view, links are classified into three categories, namely short, intermediate and long links, depending on the ratio M p /V p between the plastic moment and the plastic shear of the cross section [3][4][5][6]. The shear action is dominant for e 1.6 M p /V p (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the cyclic behaviour of short links is characterised by wide and stable cycles allowing the development of high energy dissipation capacity, provided that adequate web stiffeners are adopted along the element length to prevent web local buckling. In such a case, high rotation capacity has been experimentally exhibited by short links when compared to intermediate and long ones [4,6,7]. Several tests have clearly shown that a prop-erly stiffened short link can sustain plastic rotations up to ±0.09 rad under cyclic loading conditions or up to 0.20 rad under monotonic loading conditions [3,7].…”

Section: Introductionmentioning

confidence: 99%

“…However, the choice of the cross section provided by Eq. (19) must be validated by checking also the respect of code specifications for M-V interaction.Finally, with reference to the local ductility supply of the link, an interpolation between the values ±0.09 rad and ±0.02 rad corresponding to short and long links, respectively, provides an ultimate rotation for intermediate links with e = 2.3 equal to ±0.055 rad[4,[6][7].…”

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confidence: 99%

See 2 more Smart Citations

Validation of a Design Procedure for Failure Mode Control of EB-Frames: Push-Over and IDA Analyses

Mastrandrea¹,

Nastri²,

Piluso³

2013

TOBCTJ

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The paper is devoted to the investigation of the seismic response of eccentrically braced frames characterised by links having different length. In addition, the analysed structures have been designed according to a methodology, already proposed by the authors, aiming to guarantee a collapse mechanism of global type. Therefore, the results of the nonlinear analyses herein presented provide the validation of the proposed design procedure, by testifying that all the designed structures exhibit a global failure mode where all the links are yielded while all the columns remain in elastic range with the exception of the base section of first storey columns, leading to high energy dissipation capacity and global ductility. Furthermore, two different distributions of the link lengths are examined. The first one is characterised by short links with uniform lengths along the height of the structure. The second one is characterised by the use of link elements having different length at the different storeys which are selected to assure the same value of the non-dimensional link length. The seismic response of EB-Frames with such distributions of the link length is investigated by means of both push-over analyses and dynamic non-linear analyses. The comparison of the performances is mainly carried out in terms of plastic hinges distribution, local ductility demand and frame lateral stiffness.

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