Substitute Frame and adapted Fish-Bone model: Two simplified frames representative of RC moment resisting frames

Soleimani, Reza; Khosravi, Horr

doi:10.1016/j.engstruct.2019.01.127

Cited by 29 publications

(10 citation statements)

References 17 publications

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“…The moment-rotation relationship of the springs is the deteriorating peak-oriented hysteretic model. 44 Detailed explanation of modifications for the spring initial stiffness and strain hardening ratio was presented by Ibarra and Krawinkler. 45 The result of analyses in terms of ISD ratio is obtained from the nonlinear dynamic analyses using OpenSees software.…”

Section: The 20-story Rc Buildingmentioning

confidence: 99%

“…The zero‐length Krawinkler rotational springs was used to model the concentrated plasticity. The moment–rotation relationship of the springs is the deteriorating peak‐oriented hysteretic model 44 . Detailed explanation of modifications for the spring initial stiffness and strain hardening ratio was presented by Ibarra and Krawinkler 45…”

Section: Response Of Mdof Systemsmentioning

confidence: 99%

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Seismic response of RC buildings subjected to fling‐step in the near‐fault region

Hamidi

Karbassi²,

Lestuzzi

2019

Structural Concrete

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Fling-step and forward directivity are the major consequences of near-fault ground motions as they can impose unexpected seismic demands on structures located in the vicinity of the fault. The pernicious effect of forward directivity on the seismic behavior of structures has been studied widely. However, not much research has been conducted to investigate the influence of fling-step that is related to a large co-seismic displacement. Moreover, the inconsistent results reported in the literature create a scientific challenge about the effect of fling-step on the seismic behavior of long-period structures. In this paper, the effect of fling-step is studied by comparing the displacement ductility demand in various single degree of freedom systems with different natural frequencies and strength reduction factors, subjected to long-period ground motions (generated and as-recorded) with and without fling-step. Subsequently, two 11and 20-story reinforced concrete buildings are considered and the effect of removing the fling-step on their maximum inter-story drifts is studied. The results indicate that the ratio of the fundamental period of the structure to the fling-pulse period plays an important role and the demands imposed on those systems without fling-step may increase or decrease based on the ground motions type and structural characteristics. Also, a similar trend in the displacement ductility demand was observed in this condition.

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Section: The 20-story Rc Buildingmentioning

confidence: 99%

Section: Response Of Mdof Systemsmentioning

confidence: 99%

Seismic response of RC buildings subjected to fling‐step in the near‐fault region

Hamidi

Karbassi²,

Lestuzzi

2019

Structural Concrete

Self Cite

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“…Fish-bone models 29,30 or Stick models [31][32][33] were recently proposed to condense the behavior of the entire structure in equivalent MDOF systems. Applications of the Stick model 34 showed that the behavior of reinforced buildings both at the building scale and at the regional scale can be predicted with sufficient accuracy.…”

Section: Introductionmentioning

confidence: 99%

The use of Stick‐IT model for the prediction of direct economic losses

d’Aragona

Polese

Ludovico

et al. 2021

Earthq Engng Struct Dyn

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The Stick-IT model (Stick for Infilled frames Typologies), that is a MDOF system consisting of a series of lumped masses connected by nonlinear shear link elements, was introduced to predict the response, in terms of interstory drift ratio (IDR) and peak floor acceleration (PFA), for infilled RC building typologies. Stick model parameters can be defined starting from low level building geometrical features, easily retrievable at the large scale, such as in plan dimensions, number of stories or the percentage of infills openings and considering the infills consistency. This paper investigates the applicability of Stick-IT to predict the performance and direct economic losses for existing RC infilled frame type buildings. In the framework of a performance-based assessment, the comparison of seismic-loss outcomes provided by using either a detailed finite element model (FEM) (L1) or simplified Stick-IT structural models (L2) are illustrated and discussed. The potential of Stick-IT model is investigated referring to a real building damaged and repaired after the 2009 L'Aquila earthquake and adopting as earthquake input records registered in the proximity of the building. Story-level building damage simulated by L1 and L2 models is compared to real damage, showing satisfactory prediction. The comparison of the real repair costs with those evaluated using L1 and L2 models provides encouraging validation.The application suggests that simplified models such as Stick-IT, despite the low level of information required for its application, can be usefully applied to perform damage and loss scenarios at the large scale. Matlab code to generate the Stick-IT, as well as the example code for the present study, are openly shared through the repository https://github.com/marcogaetanidaragona/Stick-IT.

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“…MDOF simplified models have attracted the attention of researchers in the last two decades since they are better than SDOF ones at estimating the dynamic behavior of buildings. The fish-bone model [11][12][13][14][15][16] and the one-bay frame model [15,17] are among the most popular MDOF simplified models presented for momentresisting frames (MRFs). Due to the limiting assumptions of these simplified models, their range of application is often limited to regular MRFs with equal bay lengths.…”

Section: Introductionmentioning

confidence: 99%

Efficient seismic risk assessment of irregular steel‐framed buildings through endurance time analysis of consistent fish‐bone model

Amiri

Hosseini

Estekanchi

2021

Structural Design Tall Build

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The seismic risk framework of building structures has been presented to reduce earthquake-induced adverse consequences. In this context, probabilistic analysis of engineering demand parameters (EDPs) is always associated with many uncertainties and high computational demand for use in practical applications. This study has been presented to efficiently estimate the distribution of EDPs in probabilistic seismic risk assessment of irregular steel moment-resisting frames (SMRFs). For this purpose, the incorporation of the consistent fish-bone (CFB) model and the endurance time (ET) analysis method has been used. The proposed method (i.e., CFB-ET) has a substantial impact on reducing the complexities of the new generation of performance-based earthquake engineering (PBEE) by significantly reducing the degrees of freedom (DOFs) of the original building and the number of required nonlinear time history analyses (NLTHAs). The efficiency of the proposed method has been evaluated using three 3-, 9-, and 20-story SMRFs irregular in bay lengths and three other SMRFs with the same number of stories but irregular in height. In this evaluation, the maximum structural response at all seismic intensity levels up to the collapse stage and also the structural response profile along the building height at service-level earthquake (SLE), designbased earthquake (DBE), and maximum credible earthquake (MCE) seismic intensity levels have been investigated. Next, the efficiency of the proposed method in seismic risk assessment is investigated by using seismic fragility and vulnerability curves. The results of these evaluations have been compared with the full incremental dynamic analysis (IDA) of the full DOF model of the building (i.e., SMRF-IDA) under 44 far-field ground motions of FEMA P-695 in terms of computational accuracy and effort. Furthermore, a new approach to estimating the dispersion of the structural response in the ET method has been proposed, whose efficiency has been investigated in the abovementioned evaluations. The results show that the proposed method allows for using the new generation of PBEE in engineering applications by significantly reducing computational demand and having sufficient accuracy in the seismic assessment process.

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Substitute Frame and adapted Fish-Bone model: Two simplified frames representative of RC moment resisting frames

Cited by 29 publications

References 17 publications

Seismic response of RC buildings subjected to fling‐step in the near‐fault region

Seismic response of RC buildings subjected to fling‐step in the near‐fault region

The use of Stick‐IT model for the prediction of direct economic losses

Efficient seismic risk assessment of irregular steel‐framed buildings through endurance time analysis of consistent fish‐bone model

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