The Pushout Test of Seismic Reinforcement System (SRM) Connection that Respond to Earthquake Extensive Level

Hwang, Jee Youn; Ock, Jongho; Kim, Young‐Ju; Mauk, Ji-wook; Bae, Jaehoon

doi:10.1007/s40999-020-00544-1

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…The effect of deterioration parameters on symmetric and asymmetric 5-story buildings' responses was investigated and it was concluded that as the energy dissipating capacity decreases, a premature strength deterioration is likely to happen [4]. A fuse connection was examined taking into account the earthquake extensive level and then different connection methods were assessed to determine the most e cient way to reinforce an existing structure [5]. The in uence of different characteristics of earthquakes on the seismic response of moment frames in which friction dampers and isolators were used, was evaluated.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the performance of moment frames using a dumbbell-shaped rocking shear wall with additional devices

Massumi

Piri

Nematnezhad

2023

Preprint

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Studies have shown that the high cost of repairing damaged structures and the time it takes to rebuild them after an earthquake, especially in densely populated cities, impose severe financial and economic pressures on countries. To solve this problem, rocking systems were introduced as new systems to improve the seismic performance of structures. In these systems, the rocking wall is allowed to rock and elastic devices are used to provide self-centering and dissipate the seismic energy. The advantages of this system include low structural damages, ease in performing structural repairs as well as reducing the costs regarding them. In the current study, the geometry of an existing rocking shear wall attached to three- and nine-story moment-resisting frames was investigated by reducing the rocking wall’s thickness in height and also by adding border elements to the wall as dumbbells. The models were designed according to common seismic codes and then were analyzed through nonlinear time-history analysis when subjected to a series of modified near-field ground motions. According to the results, it was observed that besides exhibiting desired behavior through the combination of prestressed cables and energy dissipating elements, the modified rocking shear wall improved the performance level of the structures and reduced the amount of concrete used by 36 and 20% in 3- and 9-story models. The new system with a modified rocking wall had on average a higher fundamental period, higher base shear, and more properly distributed plastic hinges. This was because of less concrete usage, as well as deploying less prestressed cables compared to the conventional model.

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Section: Introductionmentioning

confidence: 99%

Enhancing the performance of moment frames using a dumbbell-shaped rocking shear wall with additional devices

Massumi

Piri

Nematnezhad

2023

Preprint

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“…Consequently, approaches such as seismic retrofitting and reinforcement have garnered increased research attention. Several studies have also verified the effectiveness of passive damper systems [1][2][3][4][5][6][7][8]. Given that metallic dampers are widely used owing to their cost-effectiveness and ease of replacement [9][10][11][12], several different types of steel dampers have also been proposed.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Loading Performance of Radius-Cut Double Coke-Shaped Strip Dampers

et al. 2020

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Conventional slit dampers are widely used for the purpose of seismic retrofitting, however, the structure of these dampers is susceptible to fractures, due to stress concentration at the ends of the strips in the event of large earthquakes. To address this issue, a novel radius-cut coke-shaped strip damper featuring improved ductility is proposed herein. This damper was developed based on the moment distribution over the strip when both its ends were constrained. The height‑to‑width ratio of the strip was increased to induce bending rather than shear deformation, and the reduced beam section method was employed. A radius-cut section was used to intentionally focus the stress to induce the plastic hinge. This reduced the fracture fragility of the specimen, resulting in an increased inelastic deformation capacity. Cyclic loading tests were conducted to verify damping performance against earthquakes. Experiments and finite element analyses proved that the coke-shaped damper exhibits improved ductility. The final fracture occurred in the radius-cut section after sufficient energy dissipation during cyclic loading. The results also indicated further improvements in strength due to the membrane effect under cyclic loading, caused by the tensile resistance of the strip due to its constrained ends.

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