Cyclic response sensitivity of post-tensioned steel connections using sequential fractional factorial design

Moradi, Saber; Alam, M. Shahria; Milani, Abbas S.

doi:10.1016/j.jcsr.2015.04.022

Cited by 23 publications

(4 citation statements)

References 29 publications

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“…Hence, the 32 (2 621 ) models considered in this study can well estimate the effects of the main factors associated with their interactions on the response of the bridge system. The efficiency of the method has been validated in many previous studies (Moradi et al, 2015;Wang et al, 2018;Zhang and Alam, 2016). All the treatment combinations (models) are provided in Table 3.…”

Section: Fractional Factorial Designmentioning

confidence: 99%

Seismic response sensitivity and optimal design of an isolated multi-span continuous highway bridge with self-centering SMA RC bridge piers and superelastic SMA restrainers

Wang

Alam

2022

Journal of Intelligent Material Systems and Structures

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The use of superelastic shape memory alloy (SMA) in reinforced concrete (RC) pier and restrainers between girder and pier/abutment has been proposed in an earlier study to improve the seismic performance of highway bridges. This paper aims at identifying the significant factors that affect the seismic response of such a novel bridge system. A sequential fractional factorial design method is performed to statistically evaluate the effects of six design factors (three geometry-related and three material-related) as well as their interactions. Additionally, a multi-criteria optimization technique is implemented to determine the most efficient combination of the design parameters for SMA RC piers and SMA restrainers. Results demonstrate that the geometry-related factors and their interactions have large effects (with a contribution greater than 91%) on the relative displacement between the girder and pier. The target residual drift of the pier, design target displacement of the restrainer, and their interaction are the three most significant factors (with contributions approximately 30%–68%) affecting the base shear of the pier. The residual drift of the pier is sensitive to the design target displacement of the restrainer, its interaction with the forward transformation stress of SMA, and material-related factors with regard to the energy dissipation of SMA.

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Section: Fractional Factorial Designmentioning

confidence: 99%

Seismic response sensitivity and optimal design of an isolated multi-span continuous highway bridge with self-centering SMA RC bridge piers and superelastic SMA restrainers

Wang

Alam

2022

Journal of Intelligent Material Systems and Structures

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“…A sensitivity analysis of the cyclic load-displacement response of steel plate fuses is conducted to assess the effects of different varying design parameters based on the statistical design of experiment; a method that deals with planning, analyzing, and performing controlled tests to evaluate the factors that control the value of a parameter or group of parameters; and the validated FE models. The method of carrying a sensitivity study of a number of design factors on different response variables using design of experiment is used by different researchers (e.g., [55]).…”

Section: Chapter 4 Sensitivity Analysis Of Energy Dissipating Steel Plate Fusesmentioning

confidence: 99%

Finite Element Evaluation Of Energy Dissipating Steel Plate Fuse Links

Shah¹

2021

Preprint

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<div>Steel plate devices are widely used for providing energy dissipation in earthquake resistant structures. The cyclic response of these steel plate fuses varies depending on different design factors related to the fuse link geometry or its material property. This research presents a numerical study on the cyclic response of steel plate fuses with butterfly-shaped and straight shear links. Finite element models are first developed and validated against past experimental studies. A sensitivity study using the design-of-experiment method is performed to statistically determine the effects of different design parameters on the cyclic response of steel plate shear links. Seven design factors related to the material or geometry of steel plate fuses are considered as input factors. The cyclic response of fuses is examined in terms of initial stiffness, yield strength, ultimate stiffness, effective damping, maximum strength, and ductility. From the results of the sensitivity analysis, it is shown that the overall cyclic behavior of steel plate fuses is most significantly influenced by the fuse link end-width and thickness while the fuse link length and mid-width are partially influential on some of the cyclic responses. In addition, an optimization study is performed to determine the optimal ranges for the design factors that result in simultaneous response optimization conditions, such as maximized energy dissipation capability and ductility. Predictive equations are also developed and validated for the cyclic response characteristics of steel plate shear links. Based on the confirmation runs, it is believed that these equations can accurately predict the acquired responses for steel plate fuse links.</div>

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“…Post-tensioned steel frames with energy dissipating elements (PTDE) have been shown to be a strong option to replace MRSFs [6][7][8][9][10][11][12][13][14][15][16][17][18]. In fact, recent studies have concluded that PT-DEs perform better than MRSFs with welded connections [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Improving the Seismic Performance of Steel Frames under Mainshock–Aftershock Using Post-Tensioned Connections

et al. 2023

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In this study, the seismic responses of moment-resisting steel frames (MRSFs) with welded and post-tensioned connections under 28 artificial seismic sequences (mainshock–aftershock) are compared. For this aim, the mainshock are scaled at different ground motion intensity levels as a function of the spectral pseudo-acceleration corresponding to the fundamental period of vibration of the structure Sa(T1), whereas different intensity levels of the aftershocks are used for a percentage of the peak maximum acceleration of the mainshock. The seismic performance comparison of both structural systems is computed for the maximum, residual inter-story drift and hysteretic energy demands. The results show that post-tensioned frames significantly reduce the structural demands, especially in the case of residual inter-story drifts and hysteretic energy in comparison with moment-resisting steel frames with welded connections. The reductions in the structural response tend to be larger as the intensity of the aftershock tends to increase. Therefore, it is concluded that the use of post-tensioned connections is a great alternative to mitigate the seismic response of buildings subjected to seismic sequences.

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Cyclic response sensitivity of post-tensioned steel connections using sequential fractional factorial design

Cited by 23 publications

References 29 publications

Seismic response sensitivity and optimal design of an isolated multi-span continuous highway bridge with self-centering SMA RC bridge piers and superelastic SMA restrainers

Seismic response sensitivity and optimal design of an isolated multi-span continuous highway bridge with self-centering SMA RC bridge piers and superelastic SMA restrainers

Finite Element Evaluation Of Energy Dissipating Steel Plate Fuse Links

Improving the Seismic Performance of Steel Frames under Mainshock–Aftershock Using Post-Tensioned Connections

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