Dynamic Instabilities of Simple Inelastic Structures Subjected to Earthquake Excitation

Adam, Christoph; Clemens, J. C.

doi:10.1007/978-3-7091-0797-3_2

Cited by 11 publications

(12 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since there is no unique definition of intensity of an earthquake record, several IMs have been proposed. They can be classified into (a) elastic ground motion based scalar IMs (Adam and Jäger 2012b), such as peak ground acceleration (PGA), peak ground velocity (PGV) and peak ground displacement (PGD); (b) elastic and inelastic spectral based IMs such as spectral acceleration and spectral displacement at the fundamental period of the structure, as well as spectral values related to higher modes effect or period elongation (Cordova et al 2001;Haselton and Baker 2006;Luco and Cornell 2007;Bianchini et al 2009;Kadas et al 2011;Cantagallo et al 2012;Vamvatsikos and Cornell 2005;Bojorquez and Iervolino 2011); and (c) vector valued IMs (e.g., Baker and Cornell 2005;Vamvatsikos and Cornell 2005). Currently, the most widely accepted IM is the 5 % damped pseudo-spectral acceleration at the (fundamental) period of the structure, which serves in the present study as the benchmark IM.…”

Section: Introductionmentioning

confidence: 99%

Intensity measures that reduce collapse capacity dispersion of P-delta vulnerable simple systems

Tsantaki

Adam

Ibarra

2016

Bull Earthquake Eng

Self Cite

View full text Add to dashboard Cite

The study evaluates two alternative seismic intensity measures (IMs) that reduce the collapse capacity dispersion of inelastic non-degrading single-degree-of-freedom (SDOF) systems vulnerable to the P-delta effect. This dispersion of collapse capacity is caused by record-to-record variability, which refers to frequency content variation of the ground motions used in the dynamic analyses. This reduction (of dispersion) is achieved utilizing efficient elastic pseudo-spectral acceleration based IMs. The first set of evaluated IMs is based on the spectral pseudo-acceleration averaged in a certain period interval between the structural period and an elongated period. The ''optimal'' lower bound of the period interval corresponds to the structural period of vibration, since naturally in an SDOF system no higher modes effects do exist. The ''optimal'' upper bound of the period interval for averaging, referred to as elongated period, is found to be 1.6 times the system period. The second IM considered in the study is the 5 % damped spectral pseudo-acceleration at the system period in the presence of gravity loads, which is a single target IM. The most widely accepted IM, the 5 % damped pseudo-spectral acceleration at the system period without P-delta, serves as the benchmark IM. The results show that both proposed IMs lead to a reduction of the collapse capacity dispersion compared to the benchmark IM outcomes. The IM based on the averaged spectral acceleration of the ''optimal'' period interval is more efficient up to a negative post-yield stiffness ratio of 0.45, while the single target IM based on the system period in the presence of gravity loads is superior for extreme negative post-yield stiffness ratios larger than 0.45. Additionally, the sufficiency and the scaling robustness property of the considered IMs with respect to the natural logarithm of the record-dependent individual collapse capacities is discussed for a wide range of structural configurations.

show abstract

Section: Introductionmentioning

confidence: 99%

Intensity measures that reduce collapse capacity dispersion of P-delta vulnerable simple systems

Tsantaki

Adam

Ibarra

2016

Bull Earthquake Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…The phenomenon of dynamic instability or dynamic collapse is of principal concern in the field of earthquake and structural engineering (Jennings and Husid, 1968;Sun et al, 1973;Tanabashi et al, 1973;Bertero et al, 1978;Takizawa and Jennings, 1980;Bernal, 1987Bernal, , 1998Nakajima et al, 1990;Ger et al, 1993;Challa and Hall, 1994;Hall, 1998;Hjelmstad and Williamson, 1998;Uetani and Tagawa, 1998;Araki and Hjelmstad, 2000;Sasani and Bertero, 2000;Ibarra and Krawinkler, 2005;Adam and Jager, 2012). The theoretical investigations from the viewpoint of applied mechanics have also been conducted (Herrmann, 1965;Ishida and Morisako, 1985;Maier and Perego, 1992;Araki and Hjelmstad, 2000;Williamson and Hjelmstad, 2001).…”

Section: Introductionmentioning

confidence: 99%

Closed-Form Dynamic Stability Criterion for Elastic–Plastic Structures under Near-Fault Ground Motions

Kojima

Takewaki

2016

Front. Built Environ.

View full text Add to dashboard Cite

A dynamic stability criterion for elastic-plastic structures under near-fault ground motions is derived in closed form. A negative post-yield stiffness is treated in order to consider the P-delta effect. The double impulse is used as a substitute of the fling-step near-fault ground motion. Since only the free vibration appears under such double impulse, the energy approach plays a critical role in the derivation of the closed-form solution of a complicated elastic-plastic response of structures with the P-delta effect. It is remarkable that no iteration is needed in the derivation of the closed-form dynamic stability criterion on the critical elastic-plastic response. It is shown via the closed-form expression that several patterns of unstable behaviors exist depending on the ratio of the input level of the double impulse to the structural strength and on the ratio of the negative post-yield stiffness to the initial elastic stiffness. The validity of the proposed dynamic stability criterion is investigated by the numerical response analysis for structures under double impulses with stable or unstable parameters. Furthermore, the reliability of the proposed theory is tested through the comparison with the response analysis to the corresponding onecycle sinusoidal input as a representative of the fling-step near-fault ground motion. The applicability of the proposed theory to actual recorded pulse-type ground motions is also discussed.

show abstract

“…Applying the energy concept and the Yield Point Spectra Method the structures' damage functions were considered using: the displacement modification factor, yield strength reduction factor, seismic energy response parameter, damage index and equivalent ductility ratio [24]. Possibilities of developing various fracture mechanisms in the moment resisting frame (MRF), both in storey and combined levels, are shown in [31], while in [1] and [2] the collapse mechanism of system fracture are identified on the basis of collapse capacity spectra. Generally, the system's fracture mechanism can develop locally or globally.…”

Section: Scenario Povezanih Nelinearnih Analizamentioning

confidence: 99%

“…Primenom energetskog koncepta i metode spektra odgovora za nivo granice tečenja (YPS), razmatrane su funkcije oštećenja zgrada preko: faktora modifikacije pomeranja, faktora redukcije nosivosti na granici tečenja, parametra seizmičke energije, indeksa oštećenja, koeficijenta ekvivalentne duktilnosti [24]. Razmatranje mogućnosti razvoja različitih mehanizama loma okvirnih sistema zgrada (MRF) -od spratnog do kombinovanogprikazano je u radu [31], dok je u radovima [1], [2] izvršena identifikacija kolapsnog mehanizma loma sistema na osnovu spektra kapaciteta kolapsa. Generalna podela razvoja mehanizma loma sistema jeste na lokalni i gobalni.…”

Section: Introductionunclassified

Performance analysis of damaged buildings applying scenario of related non-linear analyses and damage coefficient

Ćosić¹,

Folić²

2015

Gra mat konstru

View full text Add to dashboard Cite

Dynamic Instabilities of Simple Inelastic Structures Subjected to Earthquake Excitation

Cited by 11 publications

References 9 publications

Intensity measures that reduce collapse capacity dispersion of P-delta vulnerable simple systems

Intensity measures that reduce collapse capacity dispersion of P-delta vulnerable simple systems

Closed-Form Dynamic Stability Criterion for Elastic–Plastic Structures under Near-Fault Ground Motions

Performance analysis of damaged buildings applying scenario of related non-linear analyses and damage coefficient

Contact Info

Product

Resources

About