Seismic collapse capacity of basic inelastic structures vulnerable to the P‐delta effect

Adam, Christoph; Jäger, Clemens

doi:10.1002/eqe.1157

Cited by 64 publications

(64 citation statements)

References 19 publications

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“…For the same structural configurations, in Figure 7 the corresponding measure for the recordto-record dispersion σ = ln CC p84 /CC p16 [20], where CC p84 and CC p16 denotes the 84th and 16th percentile, respectively, of the collapse capacity, is depicted. σ is a meaningful measure of dispersion because the record-to-record variability of the collapse capacity can be in general approximated by a log-normal distribution [23], confirmed in [4,3] for PDelta sensitive structures. The outcomes show that σ is proportional to the building flexibility τ and the number of stories n, and it increases as τ and n increases.…”

Section: Non-deteriorating Frame Structures ("Base Case")mentioning

confidence: 96%

Simplified Seismic Collapse Assessment of Generic Frame Structures Subjected to Pdelta and Material Deterioration

Kampenhuber¹,

Adam²

2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. In this paper the influence of material deterioration on the seismic collapse capacity of PDelta vulnerable frame structures is quantified. The main objective is to reveal and to validate the range of applicability of the proposed equivalent single-degree-of-freedom (ESDOF) system for assessment of the global collapse capacity. This is achieved through comparison of the median collapse capacity of PDelta vulnerable generic frame structures that exhibit material deterioration in strength and stiffness with outcomes of the corresponding ESDOF system based on the derived transformation rules. Sets of planar generic frame structures are compiled varying the governing structural parameters for seismic collapse independently. In all cases, the collapse capacity is calculated using incremental dynamic analysis. Record-to-record variability of the collapse capacity is studied using a set of ordinary earthquake records compiled in FEMA-P695.

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Section: Non-deteriorating Frame Structures ("Base Case")mentioning

confidence: 96%

Simplified Seismic Collapse Assessment of Generic Frame Structures Subjected to Pdelta and Material Deterioration

Kampenhuber¹,

Adam²

2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Adam et al [13][14][15] propose to utilize collapse capacity spectra for the assessment of the collapse capacity of SDOF systems, which are vulnerable to the P-delta effect. In [15] it is shown that the effect of gravity loads on SDOF systems with bilinear hysteretic behavior is mainly characterized by means of the following structural parameters:…”

Section: Collapse Capacity Spectramentioning

confidence: 99%

“…In [15] it is shown that the effect of gravity loads on SDOF systems with bilinear hysteretic behavior is mainly characterized by means of the following structural parameters:…”

Section: Collapse Capacity Spectramentioning

confidence: 99%

“…In [15] design collapse capacity spectra are presented as a function of these parameters. As an example in Figs.…”

Section: Collapse Capacity Spectramentioning

confidence: 99%

“…Miranda and Akkar [12] present an empirical equation to estimate the minimum lateral strength up to which P-delta induced collapse of SDOF systems is prevented. In Adam et al [13][14][15] so-called collapse capacity spectra have been introduced for the assessment of the seismic collapse capacity of SDOF structures.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Induced Global Collapse of Non-deteriorating Frame Structures

Adam

Jäger

2010

Computational Methods in Applied Sciences

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In a severe seismic event the destabilizing effect of gravity loads, i.e. the P-delta effect, may be the primary trigger for global collapse of quite flexible structures exhibiting large inelastic deformations. This article deals with seismic induced global collapse of multi-story frame structures with non-deteriorating material properties, which are vulnerable to the P-delta effect. In particular, the excitation intensity for P-delta induced structural collapse, which is referred to as collapse capacity, is evaluated. The initial assessment of the structural vulnerability to P-delta effects is based on pushover analyses. More detailed information about the collapse capacity renders Incremental Dynamic Analyses involving a set of recorded ground motions. In a simplified approach equivalent single-degree-of-freedom systems and collapse capacity spectra are utilized to predict the seismic collapse capacity of regular multi-story frame structures.

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Analytical modelling of near‐source pulse‐like seismic demand for multi‐linear backbone oscillators

Baltzopoulos

Vamvatsikos

2016

Earthq Engng Struct Dyn

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Summary Nonlinear static procedures, which relate the seismic demand of a structure to that of an equivalent single‐degree‐of‐freedom oscillator, are well‐established tools in the performance‐based earthquake engineering paradigm. Initially, such procedures made recourse to inelastic spectra derived for simple elastic–plastic bilinear oscillators, but the request for demand estimates that delve deeper into the inelastic range, motivated investigating the seismic demand of oscillators with more complex backbone curves. Meanwhile, near‐source (NS) pulse‐like ground motions have been receiving increased attention, because they can induce a distinctive type of inelastic demand. Pulse‐like NS ground motions are usually the result of rupture directivity, where seismic waves generated at different points along the rupture front arrive at a site at the same time, leading to a double‐sided velocity pulse, which delivers most of the seismic energy. Recent research has led to a methodology for incorporating this NS effect in the implementation of nonlinear static procedures. Both of the previously mentioned lines of research motivate the present study on the ductility demands imposed by pulse‐like NS ground motions on oscillators that feature pinching hysteretic behaviour with trilinear backbone curves. Incremental dynamic analysis is used considering 130 pulse‐like‐identified ground motions. Median, 16% and 84% fractile incremental dynamic analysis curves are calculated and fitted by an analytical model. Least‐squares estimates are obtained for the model parameters, which importantly include pulse period Tp. The resulting equations effectively constitute an R − μ − T − Tp relation for pulse‐like NS motions. Potential applications of this result towards estimation of NS seismic demand are also briefly discussed. Copyright © 2016 John Wiley & Sons, Ltd.

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Seismic collapse capacity of basic inelastic structures vulnerable to the P‐delta effect

Cited by 64 publications

References 19 publications

Simplified Seismic Collapse Assessment of Generic Frame Structures Subjected to Pdelta and Material Deterioration

Simplified Seismic Collapse Assessment of Generic Frame Structures Subjected to Pdelta and Material Deterioration

Seismic Induced Global Collapse of Non-deteriorating Frame Structures

Analytical modelling of near‐source pulse‐like seismic demand for multi‐linear backbone oscillators

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