Near fault ground motion effects on seismic resilience of frame structures damaged in Wenchuan earthquake

Xu, Ji‐Gang; Wu, Gang; Feng, De‐Cheng

doi:10.1080/15732479.2019.1704801

Cited by 14 publications

(4 citation statements)

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“…For a single accident, in some references [7,10,11,24], different projects have different delay recovery periods, the delay period is random and influenced by the resource fulness.…”

Section: Resilience Indexmentioning

confidence: 99%

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Construction Stage Seismic Resilience Evaluation of a Continuous Girder Bridge with the Cast-in-Place Cantilever Construction Method

2023

Teh. vjesn.

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To rapidly evaluate the seismic resilience of the bridges under construction, the construction stage seismic resilience evaluation method was proposed. Based on a case bridge of continuous girder with the cast-in-place cantilever construction method, the seismic resilience of bridges at different construction stages was researched and compared. The bridge model was established by utilizing the construction stage module in the Midas Civil finite element modelling software. The functional losses of the bridges at different construction stages were computed. The three dimensional functional surfaces of Function-Time-PGA (Peak Ground Acceleration) were drawn. The resilience indexes at different construction stages with different seismic PGAs were compared, the resilience indexes with and without consideration of the delay recovery period were compared and analysed. The research results show: 1) in the control period, the functional loss is directly proportional to the PGA, but the function and resilience indexes are inversely proportional to the PGA; 2) the seismic resilience indexes of bridges at different construction stages are vastly different; 3) the resilience indexes with and without consideration of the delay recovery period are different; for the case bridge with the delay recovery period to recovery period ratio of 20%, the difference of the resilience indexes with and without consideration of the delay recovery period can reach 17% when the seismic PGA is 1.0 g. This paper provides a new method to evaluate the seismic resilience of construction stages, and it can be used to provide suggestions for the seismic damage evaluation and post-seismic recovery scheme.

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“…For a single accident, in some references [7,10,11,24], different projects have different delay recovery periods, the delay period is random and influenced by the resource fulness.…”

Section: Resilience Indexmentioning

confidence: 99%

“…Should the delay recovery period be considered? In some references [7,10,11,24], the resilience index without considering the delay recovery period had been applied. However, for the practical bridges after earthquakes, it often delays some time before the emergency reinforcement or repair recovery.…”

Section: Introductionmentioning

confidence: 99%

Construction Stage Seismic Resilience Evaluation of a Continuous Girder Bridge with the Cast-in-Place Cantilever Construction Method

2023

Teh. vjesn.

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“…[5][6][7][8] During the past two decades, ground motions with these strong pulses are of particular interest in earthquake engineering, since the intense pulses can impose particularly high seismic demands on engineered structures because of the concentrated energy that is required to be dissipated in a single or a relatively few plastic cycles. [9][10][11][12][13][14][15][16][17][18] Ever since the severe unexpected structural damage sustained in, for example, the 1971 San Fernando, the 1994 Northridge and the 1995 Kobe earthquakes, there have been continued efforts for the analysis of near-fault ground motions, including the ones observed in the newly occurred M w 7.8 Gaziantep (Turkey) earthquake. 19 Considering the limitations of visual inspection in identifying pulse-like features, Baker 20 used the wavelet analysis, with the Daubechies wavelet of the fourth order as the mother wavelet, to extract the largest velocity pulse, and the size of the extracted pulse relative to the original motion is employed to determine the significance of pulse-like features.…”

Section: Introductionmentioning

confidence: 99%

“…Ground motions containing such pulses usually have large amplitude with energy concentrated in a narrow‐band frequency region, and thereby yield unusual response spectral shapes that are accompanied by an amplified “bump” in the medium‐to‐long period range centered close to the pulse period ( T p ) 5–8 . During the past two decades, ground motions with these strong pulses are of particular interest in earthquake engineering, since the intense pulses can impose particularly high seismic demands on engineered structures because of the concentrated energy that is required to be dissipated in a single or a relatively few plastic cycles 9–18 …”

Section: Introductionmentioning

confidence: 99%

Automated parameterization of velocity pulses in near‐fault ground motions

Chang,

Wu,

Goda

2023

Earthq Engng Struct Dyn

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Proper parameterization of near‐fault ground motions is of critical importance in earthquake engineering, and this process is traditionally performed by directly fitting an analytical pulse model to the original motion. Yet such a process is usually limited by the trial‐and‐error procedure, which is strongly dependent on the initial guesses and may converge to local rather than global minimums. In this study, we propose a progressive (step‐by‐step) iterative approach that can achieve a fully automated parameterization of the velocity pulse contained in near‐fault motions. Assuming that a velocity pulse can be characterized by a pulse model with four key parameters, the approach is conducted by iteratively matching the pulse model to the smoothed ground motion, and the parameterized pulse is analytically derived by best fitting to the smoothed motion not only in the time domain but also in the spectral domain. Specifically, the velocity time history of interest is initially smoothed by a moving average filter so that the low‐frequency content can be filtered out of the original motion, from which the pulse amplitude as well as its epoch is accordingly determined. The coherent velocity pulse is then progressively extracted by performing the nonlinear least‐square‐fitting of the pulse model to the filtered low‐frequency content, during which the remaining parameters, that is, the pulse period, the number of cycles and the phase of the pulse, are estimated successively. Finally, the above procedure is applied repeatedly to the original ground motion by changing an empirical factor controlling the extent of smoothing of the motion so that convergence to local minimums that frequently occurs in the trial‐and‐error procedure could be largely avoided, and best match of the spectrum of the extracted pulse to that of the original motion can be acquired. Fitting quality of the velocity pulses is examined by comparing with existing methods. Prospective applications of the proposed procedure include the stochastic simulations of near‐fault ground motions and parametric investigations of the influence of velocity pulses on various engineered structures.

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Resilience and sustainability: Engineering solutions in disaster‐affected real estate markets

Shen

2024

Sustainable Development

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Natural disasters such as cyclones, earthquakes, floods, wildfires, and so on, have a profound influence on real estate. It often results in fluctuations in property values, demand dynamics, and development patterns within affected regions. Reconstruction efforts following natural disasters are critical for restoring property values in affected areas. This study aims to analyze the complex relationship between natural disasters and their effects on real estate trends and examines the role of engineering practices in post‐disaster reconstructions. The data for this investigation was gathered from 411 participants including disaster management experts, real estate professionals, and engineers, and SPSS was exploited to analyze it. The findings identified that natural disasters strongly affect the trends in the real estate market and lead to modifications in the values, demand, and development patterns of properties. The analysis reveals that the use of engineering practices in reconstruction efforts leads to improved structural resilience and long‐term sustainability in disaster‐affected real estate. The novelty of this study lies in the exploration of how natural disasters impact real estate trends and the innovative engineering practices employed in post‐disaster reconstructions, providing insight into crucial strategies for disaster‐resilient real estate development. The result identified that the use of engineering practices in reconstruction positively affects property demand as buyers seek resilient and safe real estate options. Furthermore, the findings demonstrate that stringent government policies promote disaster‐resilient real estate development and reconstruction.

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Near fault ground motion effects on seismic resilience of frame structures damaged in Wenchuan earthquake

Cited by 14 publications

References 50 publications

Construction Stage Seismic Resilience Evaluation of a Continuous Girder Bridge with the Cast-in-Place Cantilever Construction Method

Construction Stage Seismic Resilience Evaluation of a Continuous Girder Bridge with the Cast-in-Place Cantilever Construction Method

Automated parameterization of velocity pulses in near‐fault ground motions

Resilience and sustainability: Engineering solutions in disaster‐affected real estate markets

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