Steel structures damage from the Christchurch earthquake series of 2010 and 2011

Clifton, Charles; Bruneau, Michel; MacRae, G.A.; Leon, Roberto T.; Fussell, Alistair

doi:10.5459/bnzsee.44.4.297-318

Cited by 66 publications

(42 citation statements)

References 5 publications

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“…• Field observations from past earthquakes (eg, 63,64 ) along with numerical studies 65 suggest that the inelastic behavior of columns in structures as well as bridge piers could be considerably affected by soil-structure-interaction, which was neglected in the present study. • The paper findings suggest that recently proposed structural solutions 66,67 may be further exploited to potentially minimize steel MRF column structural damage due to local buckling.…”

Section: Limitations Of the Present Study And Future Workmentioning

confidence: 77%

“…The inherent flexibility of exposed or embedded column base connections may significantly influence the column residual axial‐shortening Field observations from past earthquakes (eg,) along with numerical studies suggest that the inelastic behavior of columns in structures as well as bridge piers could be considerably affected by soil‐structure‐interaction, which was neglected in the present study. The paper findings suggest that recently proposed structural solutions may be further exploited to potentially minimize steel MRF column structural damage due to local buckling. These have a high potential to reduce the likelihood of building demolition due to column residual axial‐shortening. Exploiting the benefits of controlled soil plastification in prospective seismic designs may be an alternative to minimize column residual axial‐shortening in steel MRFs.…”

Section: Limitations Of the Present Study And Future Workmentioning

confidence: 79%

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Proposed methodology for building‐specific earthquake loss assessment including column residual axial shortening

Elkady

Güell

Lignos

2019

Earthq Engng Struct Dyn

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Summary This paper proposes methodological developments for quantifying the impact of residual axial shortening of first‐story steel columns on earthquake loss estimations in steel moment‐resisting frame (MRF) buildings. A new formulation is proposed that accounts for the likelihood of having to demolish a steel MRF building due to column residual axial deformations in addition to residual story‐drift ratios. The formulation is informed by means of data from a comprehensive survey conducted worldwide to assess the likelihood of steel column repairability due to residual axial shortening. A practical method for quantifying column axial‐shortening in parameterized system‐level numerical simulations is presented. The proposed approach is illustrated by conducting economic seismic loss estimations in two case‐study steel MRF buildings designed in urban California according to the current seismic design practice. It is found that when the ground‐motion duration is appreciable, the examined steel MRFs are more prone to column axial‐shortening than residual story‐drifts at moderate to high seismic intensities. The results suggest that economic losses due to demolition may be underestimated if column residual axial‐shortening is neglected from loss estimations. Limitations as well as directions for future research are discussed.

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Section: Limitations Of the Present Study And Future Workmentioning

confidence: 77%

Section: Limitations Of the Present Study And Future Workmentioning

confidence: 79%

Proposed methodology for building‐specific earthquake loss assessment including column residual axial shortening

Elkady

Güell

Lignos

2019

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

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“…Repair and retrofit of EBF systems gained importance after the 2010 and 2011 New Zealand earthquakes where fractured links were replaced with new ones . The links which were damaged during the New Zealand earthquakes were not originally designed as replaceable links.…”

Section: Introductionmentioning

confidence: 99%

“…2 Repair and retrofit of EBF systems gained importance after the 2010 and 2011 New Zealand earthquakes where fractured links were replaced with new ones. [3][4][5] The links which were damaged during the New Zealand earthquakes were not originally designed as replaceable links. The existing links were removed by cutting out the braces and the collector beams and fabricating new link segments with braces based on a template obtained after link removal.…”

mentioning

confidence: 99%

Development of detachable replaceable links for eccentrically braced frames

Bozkurt

Azad

Topkaya

2019

Earthq Engng Struct Dyn

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Summary Eccentrically braced frames (EBFs) can be repaired after a major earthquake by replacing the links. The link replacement is not a straightforward process and is influenced by the type of the link and the amount of residual frame deformations. The past decade has witnessed the development of different types of replaceable links such as end‐plated links, web connected links, bolted flange and web spliced links, and collector beam and brace spliced links. All of the developed replaceable link details, except the web connected links, are not suitable for link replacement under residual frame drift. In this paper, a detachable replaceable link detail which is based on splicing the link at its mid‐length is proposed. The detail is well suited for installation under residual frame drifts. In addition, the weight and size of the members to be transported and erected are reduced significantly, thereby facilitating the replacement procedure. Performance of this proposed replaceable link is studied by conducting six nearly full scale EBF tests under quasi‐static cyclic loading. The link length ratio, type of end‐plated mid‐splice connection, and the amount of residual drift are considered as test variables. The test results revealed that the inelastic rotation capacity of the detachable replaceable links exceeds the requirements of the AISC Seismic Provisions for Structural Steel Buildings. No failures are observed in the end‐plated mid‐splice connections demonstrating the potential of the proposed details. The detachable replaceable links are investigated by numerical analysis as well to further validate their applicability and to develop design recommendations.

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“…The challenges of post disaster damage assessment have been highlighted in Christchurch, New Zealand. The absence of accepted, detailed and accurate assessment methods led to significant debate about the level of damage and remaining fatigue life of a number of structures (Clifton et al., ; Garevski, ).…”

Section: Introductionmentioning

confidence: 99%

Damage Identification for Hysteretic Structures Using a Mode Decomposition Method

Poskus

Rodgers

Zhou

et al. 2017

Computer aided Civil Eng

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This article investigates structural health monitoring (SHM) of multidegree of freedom (MDOF) structures after major seismic or environmental events. A recently developed hysteresis loop analysis (HLA) SHM technique has performed robustly for single degree of freedom (SDOF) and single mode dominant MDOF structures. However, strong ground motions can trigger higher vibration modes, resulting in irregular hysteresis loops and making this otherwise robust identification difficult. This study presents a new filtering tool, enabling reconstruction of single mode dominant restoring forcedisplacement loops which can be readily used for HLA.The proposed filtering tool is based on a classic modal decomposition using optimized mode shape coefficients. The optimization process is carried out in a modal space and is based on decoupling frequency response spectra of interfering modes. Application of modal decomposition using the optimized mode shape coefficients allows for reconstruction of single-mode dominant hysteresis loops, which can be effectively identified using HLA. The proposed filtering tool is validated on the reconstruction of hysteresis loops on an experimental bridge pier test structure with notable contributions from at least two modes.The results show the method eliminates the influence of all higher modes that contain significant energy content and yields the reconstruction of "smooth" single mode dominant hysteresis loops. The resulting SHM analysis on the reconstructed experimental hysteresis loops identified degradation in the elastic stiffness profiles, indicating damage within the structure and matching prior published results based on physical inspection of damage. The overall method presented increases the breadth of potential application of the HLA method and can be readily generalized to a range of MDOF structures.

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Steel structures damage from the Christchurch earthquake series of 2010 and 2011

Cited by 66 publications

References 5 publications

Proposed methodology for building‐specific earthquake loss assessment including column residual axial shortening

Proposed methodology for building‐specific earthquake loss assessment including column residual axial shortening

Development of detachable replaceable links for eccentrically braced frames

Damage Identification for Hysteretic Structures Using a Mode Decomposition Method

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