Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

Farzampour, Alireza; Mansouri, Iman; Dehghani, Hamzeh

doi:10.3390/buildings9040078

Cited by 18 publications

(10 citation statements)

References 15 publications

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“…It is shown that the stress distribution of the optimal model is steadily demonstrated through the length of the link due to better materials implementation and higher energy dissipation. The study also showed that the geometrical properties of the optimal model are responsible for the mode of transition from flexure yielding to shear yielding, in accordance with the transitions equation provided by Farzampour and Eatherton [18,[42][43][44][45][46][47][48]. In addition, the optimization analysis has shown that the models with thicker plates and better buckling resistance have a higher capability for dissipating.…”

Section: Discussion and Resultssupporting

confidence: 75%

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

et al. 2022

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Structural curved metal dampers are implemented in various applications to mitigate the damages at a specific area efficiently. A stable and saturated hysteretic behavior for the in-plane direction is dependent on the shape of a curved-shaped damper. However, it has been experimentally shown that the hysteretic behavior in the conventional curved-shaped damper is unstable, mainly as a result of bi-directional deformations. Therefore, it is necessary to conduct shape optimization for curved dampers to enhance their hysteretic behavior and energy dissipation capability. In this study, the finite element (FE) model built in ABAQUS, is utilized to obtain optimal shape for the curved-shaped damper. The effectiveness of the model is checked by comparisons of the FE model and experimental results. The parameters for the optimization include the curved length and shape of the damper, and the improved approach is conducted by investigating the curved sections. In addition, the design parameters are represented by B-spline curves (to ensure enhanced system performance), regression analysis is implemented to derive optimization formulations considering energy dissipation, constitutive material model, and cumulative plastic strain. Results determine that the energy dissipation capacity of the curved steel damper could be improved by 32% using shape optimization techniques compared to the conventional dampers. Ultimately, the study proposes simple optimal shapes for further implementations in practical designs.

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Section: Discussion and Resultssupporting

confidence: 75%

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

et al. 2022

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“…In future work, the author will continue to complete some frame system tests and a lot of finite element analysis [20,[50][51][52][53]. A comprehensive parametric computational study is conducted to investigate the main parameters and rules that affect the mechanical properties of links after validating the accuracy of the finite element (FE) modelling approach against previous experiments [54][55][56][57][58]. Further theoretical analysis need to do to establish the resilience model of the link.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study on Energy Dissipation Performance and Failure Mode of Web-Connected Replaceable Energy Dissipation Link

et al. 2019

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In the current design method of the eccentrically braced frame structure, the energy dissipation link and the frame beam are both designed as a whole. It is difficult to accurately assess the degree of damage through this method, and it is also hard to repair or replace the energy dissipation link after strong seismic events. Meanwhile, the overall design approach will increase the project’s overall cost. In order to solve the above mentioned shortcomings, the energy dissipation link is designed as an independent component, which is separated from the frame beam. In this paper, the energy dissipation link is bolted to the web of the frame beam. Both finite element simulation and test study of eight groups of energy dissipation links have been completed to study their mechanical behaviors, and the energy dissipation links have been studied in the aspects of length, cross section, and stiffener spacing. The mechanical behaviors include the energy dissipation behavior, bearing capacity, stiffness, and plastic rotation angle. The results indicate clearly that the hysteretic loop of links in the test and finite element analysis is relatively full. By comparing the experimental and finite element simulation data, it can be found that the general shape and trend of hysteretic loop, skeleton curve, and stiffness degradation curve are basically the same. The experiment data explicitly shows that the energy dissipation link of web-connected displays good ductility and stable energy dissipation ability. In addition, the replaceable links possess good rotational capacity when the minimum rotation angle of each specimen in the test is 0.16 rad. The results of the experiment show that the energy dissipation capacity of the link is mainly related to the section size and the stiffening rib spacing of the link. The energy dissipation ability and deformation ability of the link is poorer as the section size becomes larger; meanwhile, these abilities are reduced with the decrease of the stiffening spacing. The experiment result shows that the damage and excessive inelastic deformations are concentrated in the link to avoid any issues for the rest of the surrounding elements, and the links can be easily and inexpensively replaced after strong seismic events. The results are thought provoking, as they provide a theoretical basis for the further study of the eccentrically braced frame structure with replaceable links of web-connected. In future work, the author aims to carry out his studies through optimized design methodology based on the yielding criterion.

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“…The incremental dynamic analysis (IDA) was used to estimate the probabilistic quantities such as fragility curve [34][35][36], the mean annual frequency of exceeding limit states, and the hazard of relative displacement. Based on that, the behavior of the structure from the linear elastic step to the final collapse was investigated by choosing 13 accelerograms from different records of the earthquake (see Table 3 for further detail).…”

Section: Incremental Dynamic Analysismentioning

confidence: 99%

Effects of Brace Configuration and Structure Height on Seismic Performance of BRBFs Based on the Collapse Fragility Analysis

Shokrgozar

Golsefidi

et al. 2020

Period. Polytech. Civil Eng.

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The brace configuration and structure height are two factors that have a significant effect on the seismic behavior of braced frame buildings. In the present study, the buckling-restrained braced (BRB) frames were considered to estimate the effect of these two parameters using probabilistic seismic assessment methods. The uncertainty in the different parameters involved in the seismic design of the structural system was also considered. Four, six, and ten-story buildings with the Chevron and inverted Chevron bracing configurations were designed, and their responses due to various ground motions were estimated using incremental nonlinear dynamic analyses. Fragility curves, mean annual frequency of exceeding immediate occupancy (IO), and collapse prevention (CP) states were generated using probabilistic seismic analysis, fragility curves concept, and drift hazard curves. The results demonstrate that the inverted Chevron type BRBFs has better structural performance than Chevron bracing types. Furthermore, an increase of the height of structures, despite lower drift’s hazards, increases the fragility probability.

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Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

Cited by 18 publications

References 15 publications

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

Optimization of the Curved Metal Damper to Improve Structural Energy Dissipation Capacity

Experimental Study on Energy Dissipation Performance and Failure Mode of Web-Connected Replaceable Energy Dissipation Link

Effects of Brace Configuration and Structure Height on Seismic Performance of BRBFs Based on the Collapse Fragility Analysis

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