An improved upper-bound pushover procedure for seismic assessment of high-rise moment resisting steel frames

Rahmani, Abdallah Yacine; Bourahla, Nouredine; Bento, Rita; Badaoui, Mohamed

doi:10.1007/s10518-017-0204-9

Cited by 20 publications

(18 citation statements)

References 20 publications

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“…However, as shown in the case of Model-14 when the intensity of ground motion is 50%, the value of γ may be taken as larger than 1/2 for the conservative prediction of the maximum member force. It is interesting to note that Rahmani et al had reached a similar conclusion in their research, that the contribution of the second mode should be factored by 0.5 for the improvement of accuracy in upper stories, in their improved upper-bound pushover analysis for the traditional moment-resisting frame structures [30].…”

Section: Simultaneity Of the Peak Modal Responsementioning

confidence: 67%

Prediction of the Maximum Seismic Member Force in a Superstructure of a Base-Isolated Frame Building by Using Pushover Analysis

Fujii

2019

Buildings

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It is essential for the seismic design of a base-isolated building that the seismic response of the superstructure remains within the elastic range. The evaluation of the maximum seismic member force in a superstructure is thus an important issue. The present study predicts the maximum seismic member force of five- and fourteen-story reinforced concrete base-isolated frame buildings adopting pushover analysis. In the first stage of the study, the nonlinear dynamic (time-history) analysis of the base-isolated frame buildings is carried out, and the nonlinear modal responses of the first and second modes are calculated from pushover analysis results. In the second stage, a set of pushover analyses is proposed considering the combination of the first and second modal responses, and predicted maximum member forces are compared with the nonlinear time-history analysis results. Results show that the maximum member forces predicted in the proposed set of pushover analyses are satisfactorily accurate, while the results predicted considering only the first mode are inaccurate.

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Section: Simultaneity Of the Peak Modal Responsementioning

confidence: 67%

Prediction of the Maximum Seismic Member Force in a Superstructure of a Base-Isolated Frame Building by Using Pushover Analysis

Fujii

2019

Buildings

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“…To overcome the shortcoming of the UB pushover analysis, Rahmani et al (Rahmani et al 2018) proposed a new version of the UB method called the improved UB pushover analysis. In this version, the authors adjusted the contribution of the second mode of vibration in the load pattern formula using a correction factor 𝐶 𝑟 .…”

Section: Iub Lateral Load Patternmentioning

confidence: 99%

“…However, the target displacement is considered equal to the mean of the roof displacements calculated by the NTHA, which makes the two multi-run procedures difficult to be applied in practice. Later, Rahmani et al (Rahmani et al 2018) proposed the so-called improved upper bound (IUB) pushover analysis. The IUB procedure adjusts the contribution of the second mode of vibration in both the lateral load pattern and the target displacement formulas using a correction factor.…”

Section: Introductionmentioning

confidence: 99%

Extension of the improved upper-bound pushover analysis for seismic assessment of steel moment resisting frames with setbacks

Rahmani

Badaoui

Bourahla

et al. 2022

Bull Earthquake Eng

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Pushover analysis technique is a key tool for the performance-based seismic design that has been largely adopted in the new generation of seismic codes. Therefore, more precise and reliable performance predictions are highly demanded. Improved upper-bound (IUB) pushover analysis is one of the advanced nonlinear static procedures (NSPs) that has been recently developed. This procedure estimates adequately the response of regular and tall buildings. In this study, IUB is extended to assess the seismic response of irregular buildings with setbacks. To this end, an adjustment of the IUB lateral load distribution is implemented by integrating a third mode of vibration to control the response of these complex buildings. Fifteen multi-storey steel frames with different types of setbacks including a reference structure are used to test the accuracy of the proposed procedure by comparing its results to those from other NSPs and the nonlinear time history analysis (NLHA). The findings show the superior capacity of the extended IUB in predicting the seismic response of buildings with different levels and types of setbacks.

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“…with 𝐤 = 𝐔 𝑇 𝐊𝐔 and the corresponding back-substitutions, instead of performing the same operations with the full model matrix in Equation (15). In this way, a significant part of the computational cost for these global operations, hard to parallelize in a computer code, is avoided, while the internal forces accounting for the material nonlinearity is accurately evaluated at the full model scale with element-by-element operations easy to implement in parallelized form.…”

Section: The Reduced Order Model For a MD Of Systemmentioning

confidence: 99%

“…The improved modal pushover analysis [ 14 ] is another evolution of nonlinear static analysis based on a multi‐mode approach which allows to redefine the lateral loads in order to realize the in‐elastic deformed shape. The case of high‐rise buildings was further investigated by Rahmani et al., [ 15 ] who proposed the improved upper bound pushover analysis. It consists in adjustment of lateral loads to improve accuracy in evaluating the seismic response.…”

Section: Introductionmentioning

confidence: 99%

A reduced order model for nonlinear time history seismic analyzes of elasto‐plastic 3D frame structures

Magisano

Corrado

Madeo

et al. 2022

Earthq Engng Struct Dyn

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A reduced order model for the nonlinear dynamic seismic analysis of elastoplastic 3D frame structures is presented. It is based on an approximated solution space for the displacement field that is assumed as the sum of two subspaces. The first subspace is generated by the relevant linear elastic modes of the generalized stiffness/mass linear eigenvalue problem in terms of participation factor. The second one is defined by collapse mechanisms associated to appropriate static load distributions. The time history analyzes are carried out within the reduced solution space, while the internal forces are evaluated on the full model to guarantee an accurate description of the constitutive laws. The proposed reduction method was tested for different structural geometries varying frequency content, direction and amplitude of the ground motion. Numerical results show accuracy and robustness also employing a few tens of modes, including elastic modes and plastic collapse mechanisms. In particular, the need for plastic modes in capturing the structural dynamics in case of seismic actions leading to significant plastic excursions is emphasized. This highlights the limits of simplified approaches based on the hypothesis of shape conservation in nonlinear problems, regardless of the building regularity.

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An improved upper-bound pushover procedure for seismic assessment of high-rise moment resisting steel frames

Cited by 20 publications

References 20 publications

Prediction of the Maximum Seismic Member Force in a Superstructure of a Base-Isolated Frame Building by Using Pushover Analysis

Prediction of the Maximum Seismic Member Force in a Superstructure of a Base-Isolated Frame Building by Using Pushover Analysis

Extension of the improved upper-bound pushover analysis for seismic assessment of steel moment resisting frames with setbacks

A reduced order model for nonlinear time history seismic analyzes of elasto‐plastic 3D frame structures

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