Cyclic loading test of reinforced concrete frames protected with brace-type friction dampers

2021 ◽  
pp. 136943322110427
Author(s):  
Yusuke Maida ◽  
Hiroyasu Sakata
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Early Stage ◽  
Rc Beam ◽  
Rc Frame ◽  
Axial Deformation ◽  
Loading Test ◽  
Friction Dampers ◽  
Axial Forces ◽  
Connection Method

In this study, cyclic loading tests were conducted on reinforced concrete (RC) portal frames with brace-type friction dampers. The boundary conditions that could reproduce the axial forces exerted on the beams were adopted. To resist the axial force acting on the RC member, a damper connection method was employed by using steel inserted through the center of the RC member. The purpose of this study was to a) understand the behavior of the damper connection and the RC frame with brace-type friction dampers based on experimental tests and b) to confirm the effectiveness of the new connection method. According to the test results, the proposed connection method achieved effective damper connections in the RC frames. For the RC frame specimens with dampers, it was confirmed that the damper reached its sliding force and started to dissipate energy at an early stage with story drift ratios smaller than those at RC beam yielding. The welded part of the gusset plate and the steel inserted through the center of the RC beam were broken. When the welded part inside the beam broke and the axial deformation of the beam increased, the sliding displacement of the damper decreased. Therefore, a reliable jointing method of this part needs to be established.

scholarly journals Pseudodynamic Testing of Buildings Retrofitted with External Steel Reinforced Concrete Frames to Increase Lateral Strength for Earthquake Damage Prevention

2020 ◽  
Vol 2020 ◽  
pp. 1-21
Author(s):  
Ju-Seong Jung ◽  
Kang-Seok Lee
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Load Capacity ◽  
Earthquake Damage ◽  
Seismic Retrofitting ◽  
Rc Frame ◽  
Control Specimen ◽  
Rc Buildings ◽  
Loading Test ◽  
Steel Reinforced Concrete

In this study, a new technique for seismic retrofitting via the attachment of an “external steel reinforced concrete frame” (ESRCF) system was developed to strengthen medium-to-low-rise reinforced concrete (RC) buildings. Two methods (bolting and welding) were developed to connect existing RC frames and external strengthening elements; these methods are technically and practically suited to various construction conditions. The retrofitting method developed in this study can be used to perform seismic strengthening construction, while residents continue to live within the building. The method is categorized as a “strength design approach” implemented via retrofitting, allowing the lateral ultimate load capacity of RC buildings, whose failure mode is shear, to be increased easily. Test specimens were designed based on an existing RC building in Korea lacking seismic data and then strengthened using the ESRCF system. Pseudodynamic and cyclic loading tests were conducted to verify the effects of seismic retrofitting. In total, four RC frame specimens were prepared: one nonstrengthened control specimen for the cyclic loading test, one nonstrengthened control specimen, one specimen strengthened with a welded ESRCF system, and one specimen strengthened with a bolted ESRCF system for the pseudodynamic test. The earthquake response behavior with use of the proposed method, in terms of the maximum response strength, response displacement, and degree of earthquake damage, is compared with a control RC frame. The test results indicated that both the bolting and welding methods used for connecting the existing RC frame to the ESRCF effectively increased the lateral ultimate strength, resulting in reduced response displacement of building structures under large-scale earthquake conditions.

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

2020 ◽  
Vol 203 ◽  
pp. 109876 ◽  
Author(s):  
Zhe Qu ◽  
Xiaodong Ji ◽  
Xiao Shi ◽  
Yandong Wang ◽  
Hanquan Liu
Keyword(s):  
Cyclic Loading ◽  
Coupling Beams ◽  
Loading Test ◽  
Friction Dampers ◽  
Cyclic Loading Test ◽  
Rc Slabs ◽  
Steel Coupling Beams

scholarly journals Structural Health Monitoring and Interface Damage Detection for Infill Reinforced Concrete Walls in Seismic Retrofit of Reinforced Concrete Frames Using Piezoceramic-Based Transducers Under the Cyclic Loading

2019 ◽  
Vol 9 (2) ◽  
pp. 312 ◽  
Author(s):  
Wen-I Liao ◽  
Fu-Pei Hsiao ◽  
Chien-Kuo Chiu ◽  
Chin-En Ho
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
The Other ◽  
Structural Members ◽  
Interface Failure ◽  
Loading Test ◽  
Structural Health ◽  
Interface Damage

In this work, the piezoceramic-based transducers are used to perform the structural health monitoring (SHM) and interface damage detecting of non-ductile reinforced concrete (RC) frames retrofitted by post-installed RC walls. In order to develop the post-embedded piezoceramic-based transducers that can be used to identify interface failure or cracks between two structural members in retrofit construction, this work adopts the cyclic loading to test two specimens with post-embedded piezoceramic-based transducers (PPT). Since the failure of an interface between the post-installed wall and beam occurs, one of the specimens has damage in the foundation and existing boundary column and the other has damage in the top ends of column and wall. During the cyclic loading test, one transducer was used as an actuator to generate the stress waves and the other transducers were used as the sensors to detect the waves. In damaged specimens, the existence and locations of cracks and the interface damage can be detected by analyzing the wave response. Moreover, the severity of damage to the specimens can also be estimated. The experimental results indicate the effectiveness of the piezoceramic-based approach in the SHM and locating damage in shear-critical RC structural members under the seismic loading.

Cyclic loading test for reinforced concrete columns with continuous rectangular and polygonal hoops

2014 ◽  
Vol 67 ◽  
pp. 39-49 ◽  
Author(s):  
Tae-Sung Eom ◽  
Su-Min Kang ◽  
Hong-Gun Park ◽  
Tae-Woo Choi ◽  
Jong-Min Jin
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Columns ◽  
Loading Test ◽  
Reinforced Concrete Columns ◽  
Cyclic Loading Test

An experimental study on cyclic behaviour of reinforced concrete connections

2007 ◽  
Vol 34 (4) ◽  
pp. 565-575 ◽  
Author(s):  
Gerson Moacyr Sisniegas Alva ◽  
Ana Lúcia Homce de Cresce El Debs ◽  
Mounir Khalil El Debs
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Seismic Analysis ◽  
Reinforcement Rate ◽  
Shear Capacity ◽  
Transverse Reinforcement ◽  
Rc Beam ◽  
Concrete Compressive Strength ◽  
Cyclic Behaviour

Beam-column joints are considered critical regions within the structural system — especially under seismic loading — requiring careful design. Results from tests on four exterior reinforced concrete (RC) beam-column subassemblages are presented in this paper as part of an experimental investigation on the behaviour of RC beam-column connections under reversal cyclic loading. The influence of joint transverse reinforcement rate and concrete compressive strength on the RC beam-column connection behaviour was investigated. It is concluded that concrete compressive strength is the major factor that governs the joint shear capacity. The experimental results also indicated that joint transverse reinforcement affects the load-displacement response of such connections.Key words: cyclic loading, seismic analysis, reinforced concrete structures, beam-column connection.

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