A simplified performance based approach for the evaluation of seismic performances of steel frames

Montuori, Rosario; Nastri, Elide; Piluso, Vincenzo; Todisco, Paolo

doi:10.1016/j.engstruct.2020.111222

Cited by 38 publications

(20 citation statements)

References 26 publications

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“…It is known that the maximum bearing capacity can be evaluated by the limit analysis and by exploiting the kinematic theorem of plastic collapse. Moreover, accounting for the second order effects, the kinematic theorem is extended to the concept of collapse mechanism equilibrium curve, which is a straight line (Equation ( 5)) [27,32,36,37] where α 0 is the first order collapse multiplier and γ s is the slope of the collapse mechanism equilibrium curve:…”

Section: Second-order Rigid-plastic Analysis For Ebfs Equipped With S...mentioning

confidence: 99%

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Simplified Evaluation of Plastic Rotation Demand for Existing EBFs Equipped with Short Links

Montuori

Nastri

Piluso

et al. 2022

Metals

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The seismic events that occurred in the last decades have highlighted the importance of a correct design of the structures in seismic areas and the seismic inadequacy of a large part of the built heritage. Modern codes are still lacking in terms of prescriptions for the evaluation of the seismic performance of existing buildings. The present work proposes a simplified method for the evaluation of the demand in terms of plastic rotation for short links of steel Eccentrically Braced Frames (EBFs). A relationship for the evaluation of the demand, that exploits elastic analysis and rigid-plastic analysis extended to the second-order effects, is proposed. The calibration of this relationship was carried out on 420 EBFs equipped with short links designed according to three different approaches. The 420 frames have been also used to analyze the behavior in the plastic range of EBF type structures equipped with short links. The study also provides an extensive analysis on the influence of plastic redistribution capacity on the demand in terms of plastic rotations of links, corresponding to the achievement of the maximum bearing capacity. The obtained relation can be exploited as an assessment tool by comparing the demand with the link capacity. Moreover, from a performance-based design point of view, the same can be used for predicting the required ultimate plastic rotation as a function of the plastic redistribution capacity of the structure.

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Section: Second-order Rigid-plastic Analysis For Ebfs Equipped With S...mentioning

confidence: 99%

“…The calibration of such relation is made using the result of the pushover analyses of 420 EBFs, with short links designed according to three different approaches [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Simplified Evaluation of Plastic Rotation Demand for Existing EBFs Equipped with Short Links

Montuori

Nastri

Piluso

et al. 2022

Metals

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“…This, to simulate the level of plastic damage in each case. Even though there are methodologies that suggest that it is possible to not require this type of complexity in the evaluation of the seismic behavior of a structure subjected to a seismic signal (Montuori et al, 2020), this is necessary for the present study, given the complexity of Bogota soils. These soils have been studied locally, and there are design spectra for each sector of the city.…”

Section: Elementmentioning

confidence: 99%

Nonlinear dynamic analysis of steel buildings subjected to earthquakes

2021

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Non-linear dynamic analyses methods generally provide a more adjusted modeling of the structural response for strong seismic events. Such a dynamic seismic nonlinear evaluation took place for six buildings: two 5 story-height, two 12 story-height and two 20 story-high and with a regular configuration. The structural systems of the buildings complied to the NSR-10 (Colombian earthquake resistant standard) and with the seismic microzoning of Bogotá. The analysis done to the previous structures used non-linear methodologies along with two time-histories corresponding to two well recorded earthquakes: Quetame earthquake circa 2008 and the Mesa de los Santos earthquake circa 2015. Said events characterized by records at Bogotá D.C. by the RAB (network of accelerometers of Bogotá). A structural evaluation using the nonlinear approach of a finite element software and following the FEMA 356 guidelines, the structural response to 81 seismic signals from the Mesa de los Santos earthquake and 78 from the Quetame earthquake helped in understanding the simulated behavior. Said signals included three perpendicular ground movements corresponding to the north-south, east-west and vertical directions. With the results of the non-linear dynamic analysis, plastic hinges helped in understanding the nonlinear structural response when the earthquakes hit separately. Based on the results, sway maps showing the results in the Y and X directions, clustered the most affected areas of the city. At the same time, a thorough analysis of moment connections at the first floor, at an intermediate floor and at the last floor of the buildings showed the capacity of the original design. The results suggest that steel buildings have a better structural performance when compared with reinforced concrete buildings that were also analyzed (nonlinear analysis) with real earthquake (in soft soils) in previous investigations.

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“…The implementation of a non−linear model needs adequate experience and, first of all, an adequate knowledge of the condition of the building to be modelled in terms of geometry, loads, structural details, materials and degradation [14][15][16][17][18]. In the perspective of a seismic classification of the built heritage, it is necessary to define a standardizable, unique and user−friendly methodology [19][20][21][22]; therefore, recently, a simplified assessment approach has been developed concerning steel moment resisting frames (MRFs) [23] based on a trilinear model that needs only the elastic structural analysis and the rigid-plastic analysis and does not require any static or dynamic non−linear effort. Rigid plastic analysis has generally been used as an assessment tool against vertical and horizontal loads.…”

Section: Introductionmentioning

confidence: 99%

“…• Maximum load-bearing capacity curve according to the modified Merchant−Rankine formulation [23,37,38]…”

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confidence: 99%

Evaluation of the Seismic Capacity of Existing Moment Resisting Frames by a Simplified Approach: Examples and Numerical Application

et al. 2021

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The capacity of a structure can be assessed using inelastic analysis, requiring sophisticated numerical procedures such as pushover and incremental dynamic analyses. A simplified method for the evaluation of the seismic performance of steel moment resisting frames (MRFs) to be used in everyday practice has been recently proposed. This method evaluates the capacity of buildings employing an analytical trilinear model without resorting to any non−linear analysis. Despite the methodologies suggested by codes, the assessing procedure herein described is of easy application, also by hand calculation. Furthermore, it constitutes a suitable tool to check the capacity of the buildings designed with the new seismic code prescriptions. The proposed methodology has been set up through a large parametric analysis, carried out on 420frames designed according to three different approaches: the theory of plastic mechanism control (TPMC), ensuring the design of structures showing global collapse mechanism (GMRFs), the one based on the Eurocode 8 design requirements (SMRFs), and a simple design against horizontal loads (OMRFs) without specific seismic requirements. In this paper, some examples of the application of this simplified methodology are proposed with references to structures supposed to exhibit global, partial and soft storey mechanism.

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A simplified performance based approach for the evaluation of seismic performances of steel frames

Cited by 38 publications

References 26 publications

Simplified Evaluation of Plastic Rotation Demand for Existing EBFs Equipped with Short Links

Simplified Evaluation of Plastic Rotation Demand for Existing EBFs Equipped with Short Links

Nonlinear dynamic analysis of steel buildings subjected to earthquakes

Evaluation of the Seismic Capacity of Existing Moment Resisting Frames by a Simplified Approach: Examples and Numerical Application

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