Probabilistic collapse analysis of degrading Multi Degree of Freedom structures under earthquake excitation

Chenouda, Mouchir; Ayoub, Ashraf

doi:10.1016/j.engstruct.2009.07.018

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…The proof of concept system is modelled as a single degree of freedom (SDOF) structure using an elastic-plastic bilinear hysteric model, and analyses cases with and without initial or prior stiffness degradation. Such a bilinear model has been widely used to represent the basic inelastic system with P-delta effect [2,6,17,28,29], where the yielding displacement dy divides the response into an elastic segment and a plastic segment as shown in Figure 1. The HLA SHM method [25] is used to determine the current damaged or undamaged structural parameters of the system.…”

Section: Methodsmentioning

confidence: 99%

A combined SHM/IDA method for assessing collapse capacity and risk in subsequent ground motions

Fitzjohn

Zhou

Chase

2019

J Civil Struct Health Monit

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Prediction of building collapse due to significant seismic motion is a principle objective of earthquake engineers, particularly after a major seismic event when the structure is damaged and decisions may need to be made rapidly concerning the safe occupation of a building or surrounding areas. Traditional model-based pushover analyses are effective, but only if the structural properties are well understood, which is not the case after an event when that information is most useful. This paper combines Hysteresis Loop Analysis (HLA) structural health monitoring (SHM) and Incremental Dynamic Analysis (IDA) methods to identify and then analyse collapse capacity and probability of collapse for a specific structure, at any time, a range of earthquake excitations to ensure robustness. This nonlinear dynamic analysis enables constant updating of building performance predictions following a given and subsequent earthquake events, which can result in difficult to identify deterioration of structural components and their resulting capacity, all of which is far more difficult using static pushover analysis. The combined methods and analysis provide near real-time updating of the collapse fragility curves as events progress, thus quantifying the change of collapse probability or seismic induced losses very soon after an earthquake for decision-making. Thus, this combination of methods enables a novel, higher resolution analysis of risk that was not previously available. The methods are not computationally expensive and there is no requirement for a validated numerical model, thus providing a relatively simpler means of assessing collapse probability immediately post-event when such speed can provide better information for critical decision-making. Finally, the results also show a clear need to extend the area of SHM toward creating improved predictive models for analysis of subsequent events, where the Christchurch series of 2010-2011 had significant post-event aftershocks.

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Section: Methodsmentioning

confidence: 99%

A combined SHM/IDA method for assessing collapse capacity and risk in subsequent ground motions

Fitzjohn

Zhou

Chase

2019

J Civil Struct Health Monit

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“…This approach was used by several researchers in the literature (e.g. [14,26]) and proved to give precise results.…”

Section: Incremental Dynamic Analysis Target Performance Levels and mentioning

confidence: 96%

“…Fundamental mode of vibration [ [12][13][14] as well as to bridges [15]. For specific details of the records including earthquake names, sensor location, magnitude, distance, soil type, faulting mechanism, and peak waveform ordinates, one may be referred to [12].…”

Section: Building Typementioning

confidence: 99%

Assessment of RC moment frame buildings in moderate seismic zones: Evaluation of Egyptian seismic code implications and system configuration effects

Mehanny

Howary

2010

Engineering Structures

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“…15 A number of studies utilise frames that have been designed to specific seismic code requirements or design methodologies. A small number of recent studies have investigated the effect of degradation on the inelastic response of buildings using cyclic constitutive models developed for reinforced concrete [21][22][23] or steel models adapted to very specific types of moment connections. It was shown that the salient parameters that influence the global and the inter-storey drifts are the ratio of the fundamental period of the frames to the mean period of the ground motion, as well as the level of inelasticity-expressed through the "actual" behaviour factor of the frames.…”

Section: Introductionmentioning

confidence: 99%

“…As in the case of most investigations with SDOF systems, the steel frame models used in existing studies are non-deteriorating, mainly for the sake of simplicity and computational efficiency. A small number of recent studies have investigated the effect of degradation on the inelastic response of buildings using cyclic constitutive models developed for reinforced concrete [21][22][23] or steel models adapted to very specific types of moment connections. [24][25][26][27][28] The development of relatively simple hysteretic constitutive models that enable the modelling of deterioration in the strength and stiffness of components of steel structures 14 and the availability of empirical relationships for the calibration of the critical modelling parameters that affect the cyclic moment-rotation relationship at plastic hinge regions, on the basis of information from experimental data, 29 provide the means for investigating the inelastic displacement response of multi-storey steel frames with deteriorating components.…”

Section: Introductionmentioning

confidence: 99%

Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8

Tsitos

Bravo‐Haro

Elghazouli

2017

Earthq Engng Struct Dyn

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This paper assesses the influence of cyclic and in-cycle degradation on seismic drift demands in moment-resisting steel frames (MRF) designed to Eurocode 8. The structural characteristics, ground motion frequency content, and level of inelasticity are the primary parameters considered. A set of single-degree-of-freedom (SDOF) systems, subjected to varying levels of inelastic demands, is initially investigated followed by an extensive study on multi-storey frames. The latter comprises a large number of incremental dynamic analyses (IDA) on 12 frames modelled with or without consideration of degradation effects. A suite of 56 far-field ground motion records, appropriately scaled to simulate 4 levels of inelastic demand, is employed for the IDA. Characteristic results from a detailed parametric investigation show that maximum response in terms of global and inter-storey drifts is notably affected by degradation phenomena, in addition to the earthquake frequency content and the scaled inelastic demands. Consistently, both SDOF and frame systems with fundamental periods shorter than the mean period of ground motion can experience higher lateral strength demands and seismic drifts than those of non-degrading counterparts in the same period range. Also, degrading multi-storey frames can exhibit distinctly different plastic mechanisms with concentration of drifts at lower levels. Importantly, degrading systems might reach a "near-collapse" limit state at ductility demand levels comparable to or lower than the assumed design behaviour factor, a result with direct consequences on optimised design situations where over-strength would be minimal. Finally, the implications of the findings with respect to design-level limit states are discussed

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Probabilistic collapse analysis of degrading Multi Degree of Freedom structures under earthquake excitation

Cited by 12 publications

References 20 publications

A combined SHM/IDA method for assessing collapse capacity and risk in subsequent ground motions

A combined SHM/IDA method for assessing collapse capacity and risk in subsequent ground motions

Assessment of RC moment frame buildings in moderate seismic zones: Evaluation of Egyptian seismic code implications and system configuration effects

Influence of deterioration modelling on the seismic response of steel moment frames designed to Eurocode 8

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