Incorporation of strong motion duration in incremental-based seismic assessments

Mashayekhi, ‪Mohammadreza; Harati, Mojtaba; Darzi, Atefe; Estekanchi, Homayoon E.

doi:10.1016/j.engstruct.2020.111144

Cited by 17 publications

(12 citation statements)

References 85 publications

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“…Der Kiureghian (1996) [42] introduced a coherency model that considers the incoherence, local site effects and wave-passage [42][43]. The model presented as: (6) In which the first term describes the incoherence effects [42][43], second is wave-passage [42] and the third is the site-response effects [39][40]. In this equation, 𝛼 represents the incoherence, 𝑑 𝑘𝑙 is the distance between stations k and l, s  is the shear wave velocity, L kl d is the projected algebraic horizontal distance in the longitudinal direction of propagation of waves, 𝑣 𝑎𝑝𝑝 is the surface apparent wave velocity, for long distances…”

Section:  mentioning

confidence: 99%

Fragility Analysis of RC Bridges Considering Spatially Varying Ground Motions and SSI

Hosseinnezhad

Gholizad

2022

Scientia Iranica

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Long-span structures like bridges experience different movements at the supports because of the wavepassage, incoherence, and site-response effects. In this study, spatially varying ground motions were used to evaluate the seismic vulnerability of different RC bridges. To gain the goal, three prototypes Caltrans reinforced concrete curve bridges with different column heights and various radii selected and used for the numerical study. The spatially correlated ground motions generated by the conditional simulation method and then converted to corresponding displacements time histories to perform non-uniform excitations. The structures were analyzed under generated series and the fragility curves developed based on the defined limit states. Furthermore, soil-structure interactions and different soil conditions were included evaluating the non-linear behavior of the bridges. The results show that the damage exceedance probability increased under non-uniform excitations and it is more evident for long-span bridges. Also, it is found that the effect of soil-structure interactions on the probability of failure of short span bridges is negligible, still, for long-span bridges, the impact is significant. Moreover, from results for structures situated on soft deposits, a combination of spatially varying ground motions in conjunction with soilstructure inter-actions remarkably increases the responses.

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Section:  mentioning

confidence: 99%

Fragility Analysis of RC Bridges Considering Spatially Varying Ground Motions and SSI

Hosseinnezhad

Gholizad

2022

Scientia Iranica

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“…The previous methodologies for simulation of ETEFs include just frequency content and amplitude of motions. The duration-related parameter like ground motion duration and the factor standing for the hysteretic energy of the system can have a considerable impact on the nonlinear dynamic response of the structures [21][22][23][24]. The consistency of hysteretic energy as a parameter related to cumulative damage is considered in the process.…”

Section: Selected Ground Motions and Etefsmentioning

confidence: 99%

Performance-based optimal distribution of viscous dampers in ‎structure using hysteretic energy compatible endurance time excitations

Shirkhani

Azar²,

Basim³

et al. 2021

NMCE

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Performance-based optimization of energy dissipation devices in structures necessitates massive and repetitive dynamic analyses. In the endurance time method known as a rather fast dynamic analysis procedure, structures are subjected to intensifying dynamic excitations and their response at multiple intensity levels is estimated by a minimal number of analyses. So, this method significantly reduces computational endeavors. In this paper, the endurance time method is employed to determine the optimal placement of viscous dampers in a weak structure to achieve the desired performance at various hazard levels, simultaneously. The viscous damper is one of the energy dissipation systems which can dissipate a large amount of seismic input energy to the structure. To this end, hysteretic energy compatible endurance time excitation functions are used and the validity of the results is investigated by comparing them with the results obtained from a suite of ground motions. To optimize the placement of the dampers, the genetic algorithm is used. The damping coefficients of the dampers are considered as design variables in the optimization procedure and determined in such a way that the sum of them has a minimum value. The behavior of the weak structure before and after rehabilitation is also investigated using endurance time and nonlinear time history analysis procedures in different hazard levels.

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“…This difference increases with increasing the excitation level and can be attributed to the nonlinear behavior of the model under high intensity excitation that is influenced by several parameters including excitation duration, number of cycles, etc. More information about this dependency can be found elsewhere [28][29][30][31].…”

Section: Longitudinal Directionmentioning

confidence: 99%

Application of Endurance Time method in evaluation of seismic performance of a typical sandwich panel building

Yekrangnia

2020

NMCE

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This study deals with the seismic performance evaluation of a typical five-story sandwich panel building with load-bearing wall as the only lateral force-resisting structural elements. For this purpose, incremental dynamic analyses (IDA) were performed on the model making use of seven selected ground motions. As a substitute to IDA, the response of the model in terms of maximum plastic strain, base shear and the inter-story drift ratio of the first story were compared with those from Endurance Time (ET) analysis. The results show that ET can simulate the seismic response of the studies model with an acceptable accuracy. However, the discrepancy between the ET results and those of the real ground motions increases with by increasing the excitation intensity. In general, ET underpredicts the drift ratios in very intense excitations, whereas the error of base shear with respect to the real ground motions remains almost constant regardless of the ground motion intensity.

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Incorporation of strong motion duration in incremental-based seismic assessments

Cited by 17 publications

References 85 publications

Fragility Analysis of RC Bridges Considering Spatially Varying Ground Motions and SSI

Fragility Analysis of RC Bridges Considering Spatially Varying Ground Motions and SSI

Performance-based optimal distribution of viscous dampers in ‎structure using hysteretic energy compatible endurance time excitations

Application of Endurance Time method in evaluation of seismic performance of a typical sandwich panel building

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