Improved Procedure for Design and Evaluation of Structures: Single-Degree-of-Freedom Bilinear Systems

Chikh, Benazouz; Leblouba, Moussa; Mehani, Youcef; Zerzour, A.; Bechtoula, H.; Benyoucef, Abdelkader

doi:10.7712/120113.4777.c1580

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…In order to understand the influence of con nection flexibility on maximum story acceleration, Figure 22 is presented. Figure 22 illus trates the maximum story acceleration in each story of the frames presented in Figure 3 with different connection rigidities and SPSWs with 200 mm holes implemented in them Higher ductility structures embody a damping mechanism that is able to dissipate high-acceleration ground motions [53]. It is further proven in Figure 22a that by using ductile (non-rigid) connections, the peak story acceleration decreased.…”

Section: Maximum Accelerationmentioning

confidence: 84%

“…As observed in these figures, the frames with rigid connections had the highest story acceleration. As mentioned earlier, by decreasing connection rigidity and perforating the SPSWs, the ductility of the frames reduces [30,32]; therefore, frames with smaller holes and higher rigidity experience higher accelerations during seismic events [53]. In order to obtain a better understanding of how much it is possible to reduce the maximum story acceleration, the figures related to the maximum story drifts must be controlled simultaneously.…”

Section: Maximum Accelerationmentioning

confidence: 99%

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On the Seismic Evaluation of Steel Frames Laterally Braced with Perforated Steel Plate Shear Walls Considering Semi-Rigid Connections

et al. 2022

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Steel plate shear walls usually do not satisfy the strong-column weak-beam design criteria, leading to larger column sections. On the other hand, rigid frame structures are typically constructed in low-rise to mid-rise buildings built in locations prone to strong earthquakes due to their high flexibility and cost-effective solutions. Overcoming these restrictions to the SPSW system, this paper is dedicated to employing a semi-rigid connection that dissipates energy well and reduces the forces applied to the structure. By using a semi-rigid connection in an adjacent span to the SPSW, the actual flexural capacity of the beam end decreases and, subsequently, improves the performance of the structure in terms of the of the strong-column weak-beam criteria. Thereupon, the impact of the semi-rigid connections on steel frames with SPSWs as a sideway resisting system can be assessed by implementing a numerical study. In this paper, a new methodology for modelling semi-rigid joints is used considering five connections with different moment capacities. Moreover, the influence of three different circular diameters on the behavior of the perforated SPSWs was investigated. To fulfil these purposes, nonlinear dynamic analysis was conducted to assess the reliability of 5-, 10-, and 15-story frames resisted with SPSWs and semi-rigid connections subjected to actual ground motion records. A total of 45 frames were modelled and the obtained results were compared with reference benchmarks. The outcomes of the studies show good agreement with design building code requirements. In addition, the reliable performance of the structure under seismic loads is evaluated. According to the results of the parametric study, the presumed allowable drift leads to obtaining the optimum moment capacity of connection for each model and illustrates the applicability of a new structural system consisting of SPSWs and semi-rigid connections simultaneously.

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Section: Maximum Accelerationmentioning

confidence: 84%

Section: Maximum Accelerationmentioning

confidence: 99%

On the Seismic Evaluation of Steel Frames Laterally Braced with Perforated Steel Plate Shear Walls Considering Semi-Rigid Connections

et al. 2022

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“…The seismic response is one of the most important indicators in performance evaluation and vulnerability assessment of existing buildings [1] . Many procedures and approaches have been proposed to estimate the seismic demand and response [2] [3] [4] . ATC-40 [5] and FEMA [6], [7] proposed alternative procedures based on the capacity evaluation of the structures to calculate the performance point and the target displacement.…”

Section: Introductionmentioning

confidence: 99%

A comparative study between the ANN-based and the current methods for seismic response estimation in the case of single degree of freedom systems

2023

1st International Conference on Modern and Advanced Research Icmar 2023

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The target displacement is one of the most critical performance indicators in the seismic vulnerability assessment. The Nonlinear Time History Analysis (NL-THA) is the most reliable method for calculating the seismic response of any building by solving the differential equation of motion. However, this procedure is considered time-consuming, and it needs expertise to perform. For that reason, many codes and standards have proposed and adopted various methods and procedures to estimate and predict the seismic response and target displacement. These alternative methods represent some prediction uncertainties. Machine Learning (ML) algorithms became an exciting tool in earthquake engineering due to their performance and prediction simplicity. This paper compares the target displacement prediction of a novel Artificial Neural Networks (ANNs) method to the Displacement coefficient Method (DCM) adopted by FEMA-356, the Modified Coefficient Method (MCM) adopted by FEMA-440, and the NL-THA. The comparison is performed to 10 Single degrees of Freedom (SDOF) with different vibration periods and yielding forces (fy). The ANN model uses the SDOF characteristics and the ground motion (GM) parameters to estimate the maximum inelastic response. The results show a high performance of the ANNbased method in terms of Mean squared Errors (MSE), Mean Relative Error (MRE), and Mean Absolute Error (MAE).

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“…Several simple evaluation methods have been proposed as an alternative to the complex nonlinear dynamic analysis to estimate the seismic demands of structures (Gülkan and Sözen 1974;Freeman et al 1975;Newmark and Hall 1982;Fajfar and Fischinger 1988;Kowalsky 1994;Sasaki et al 1998;Fajfar 1999;Gupta and Kunnath 2000;Albanesi et al 2000;Priestley and Kowalsky 2000;Miranda 2001;Chopra and Goel 2001;Lin and Chang 2003;Maja and Fajfar 2012;Chikh et al 2014;Zerbin and Aprile 2015;Kazaz 2016). The basic idea of these methods is to relate the structural capacity to the physical basis of elastic or inelastic demand spectra, as the Capacity Spectrum Method (ATC-40 1996) and its different implementations.…”

Section: Introductionmentioning

confidence: 99%

Approximate Multimodal Dynamic Analysis to Estimate the Seismic Demands of Structures

Chikh

Mehani

Hadid

et al. 2017

Facing the Challenges in Structural Engineering

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Abstract. Methods for the seismic demands evaluation of structures require iterative procedures. Many studies dealt with the development of different inelastic spectra with the aim to simplify the evaluation of inelastic deformations and performance of structures. Recently, the concept of inelastic spectra has been adopted in the global scheme of the Performance-Based Seismic Design (PBSD) through Capacity-Spectrum Method (CSM). For instance, the Modal Pushover Analysis (MPA) has been proved to provide accurate results for inelastic buildings to a similar degree of accuracy than the Response Spectrum Analysis (RSA) in estimating peak response for elastic buildings. In this paper, a simplified nonlinear procedure for evaluation of the seismic demand of structures is proposed with its applicability to multi-degree-of-freedom (MDOF) systems. The basic concept is to write the equation of motion of (MDOF) system into series of normal modes based on an inelastic modal decomposition in terms of ductility factor. The accuracy of the proposed procedure is verified against the Nonlinear Time History Analysis (NL-THA) results and Uncoupled Modal Response History Analysis (UMRHA) of a 9-story steel building subjected to El-Centro 1940 (N/S) as a first application. The comparison shows that the new theoretical approach is capable to provide accurate peak response with those obtained when using the NL-THA analysis. After that, a simplified nonlinear spectral analysis is proposed and illustrated by examples in order to describe inelastic response spectra and to relate it to the capacity curve (Pushover curve) by a new parameter of control, called normalized yield strength coefficient (g). In the second application, the proposed procedure is verified against the NL-THA analysis results of two buildings for 80 selected real ground motions.

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Improved Procedure for Design and Evaluation of Structures: Single-Degree-of-Freedom Bilinear Systems

Cited by 4 publications

References 9 publications

On the Seismic Evaluation of Steel Frames Laterally Braced with Perforated Steel Plate Shear Walls Considering Semi-Rigid Connections

On the Seismic Evaluation of Steel Frames Laterally Braced with Perforated Steel Plate Shear Walls Considering Semi-Rigid Connections

A comparative study between the ANN-based and the current methods for seismic response estimation in the case of single degree of freedom systems

Approximate Multimodal Dynamic Analysis to Estimate the Seismic Demands of Structures

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