Cyclic loading test of steel coupling beams with mid-span friction dampers and RC slabs

Summary This paper presents an experimental study on the performance of a shear‐sliding stud‐type damper composed of multiple friction units with high‐tension bolts and disc springs. A numerical evaluation of the response reduction effects achieved by the stud‐type damper is also presented. In dynamic loading tests, the behavior of stud‐type multiunit friction damper specimens was investigated. Three different full‐scale damper specimens, which were composed of five, six, or seven friction units with two or four sliding surfaces, were incorporated into loading devices for testing. The stud‐type friction dampers demonstrated stable rigid‐plastic hysteresis loops without any remarkable decrease in the sliding force even when subjected to repetitive loading, in addition to showing no unstable behavior such as lateral buckling. The damper produced a total sliding force approximately proportional to the number of sliding surfaces and friction units. The total sliding force of the stud‐type damper can thus be estimated by summing the contributions of each friction unit. In an earthquake response simulation, the control effects achieved by stud‐type dampers incorporated into an analytical high‐rise building model under various input waves, including long‐period, long‐duration and pulse‐like ground motions, were evaluated. A satisfactory response reduction was obtained by installing the developed stud‐type dampers into the main frame without negatively impacting usability and convenience in terms of building planning.

Section: Test Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic loading tests and seismic response analysis of a stud‐type damper composed of multiple friction units with disc springs

Sano

Shirai

Suzui

et al. 2020

“…Friction dampers can be categorized into translation‐type, rotation‐type, and shear‐type devices based on frictional trajectory 6 . Furthermore, friction dampers can be integrated with diverse structural components, including compression members of space structures, 7 replaceable coupling beams of coupled shear walls, 8 and beam‐column joints of frames 9 . Previous studies have shown that friction dampers can improve the response control ability of the structure and significantly reduce structural damage 10 .…”

Section: Introductionmentioning

confidence: 99%

Development and optimization of a novel response‐amplified friction damper with different friction pairs

Gao,

Song,

Wang

et al. 2023

In order to improve the efficiency of friction dampers, a shear‐type response‐amplified friction damper (RAFD) was proposed, which utilized a lever mechanism to amplify the shear displacement and increase the sliding distance of friction pairs. Cyclic loading tests were conducted on 12 RAFD specimens to evaluate the effects of machining processes, friction materials, loading protocols, and bolt pretension on the mechanical performance of the specimens. The results showed that the RAFD specimens with NAO and brass friction pads exhibited plump hysteresis loops, and the bearing capacity, effective stiffness, energy dissipation, and equivalent viscous damping ratio all met the stability requirements of FEMA 356 for the friction damper. Reducing the clearance between pins and holes and strengthening the hole edges shortened the plateau near zero resistances of the hysteresis loops by 75%–90%. Furthermore, combined with rotational analysis of the lever, a design methodology for the RAFD specimen was developed. Based on the response amplification factor R, key mechanical indices such as bearing capacity and equivalent friction coefficient were derived, and a theoretical hysteresis model for the RAFD was constructed, which matched well with experimental results.

“…Recent studies developed new coupling beams by introducing various dampers into the mid-span of coupling beams, such as metallic dampers, 2-7 viscoelastic dampers, 8 and friction dampers. [9][10][11] They have shown excellent energy dissipation capacity and better damage controllability than the traditional reinforced concrete (RC) coupling beams.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of bending‐type frictional steel truss coupling beams

Cui

Tang

Wu³

et al. 2021

Traditional coupling beams, once seismically damaged, are very difficult to be repaired. Recent studies developed new coupling beams by introducing mid-span dampers. The shear deformation is concentrated in the damper, thus protecting the primary concrete members. However, the concentrated shear deformation will result in slab damage. This paper proposes a novel bending-type steel truss coupling beam (BFTCB) that adapts to slab bending deformation. The steel truss is securely connected to the slab at the top chord. It remains elastic during an earthquake, while inelastic deformation is confined to friction dampers equipped on both ends of the bottom chord. Friction dampers render the coupling beam damage-reparability, which can be rapidly repaired by retightening or replacing the bolts after a major earthquake. The main body of wall piers sustain negligible damage and can remain in service; thus, they can be exposed to more earthquakes during the lifetime of the building. Unlike solid web sections, the truss configuration decouples bending and shear demands, as well as stiffness and strength, which improves the design flexibility. Quasi-static tests were conducted to validate the design concepts and confirm the replaceability of the BFTCB. The BFTCB displayed full and stable hysteretic behavior. The theoretical formula for the strength and stiffness of the BFTCB afforded acceptable accuracy.The proposed BFTCB shows promising potential for resilience-oriented highperformance structures.