scholarly journals Performance of the Cold-Bending Channel-Angle Buckling-Restrained Brace under Cyclic Loading

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Kun Wang ◽  
Junwu Xia ◽  
Xiaomiao Chen ◽  
Bo Xu ◽  
Xiangzhou Liang ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Model Parameters ◽  
Loading Test ◽  
Skeleton Curve ◽  
Channel Angle ◽  
Buckling Restrained Brace ◽  
External Constraint ◽  
Cold Bending ◽  
Hysteretic Performance

In this study, three restricted cold-bending channel-angle buckling-restrained brace (CCA-BRB) specimens were experimentally characterised by a low-reversed cyclic loading test. Three specimens had steel cores with cruciform cross section. Two restraining units were assembled to form an external constraint member, each of which was composed of an equilateral cold-bending channel and two equilateral cold-bending angles via welding. A gap or a thin silica gel plate was set between the internal core and the external constraint member to form an unbonded layer. Several evaluation parameters on the seismic performance, hysteretic behaviour, and energy dissipation capability of the CCA-BRB was investigated, including hysteresis curve, skeleton curve, compression strength adjustment factor, measured and computed stiffness, energy dissipation coefficient, equivalent viscous damping ratio, ductility coefficient, and cumulative plastic deformation. The test results and evaluation indices demonstrated that the hysteretic performance of braces with a rigid connection was stable. A Ramberg–Osgood model and two model parameters were calibrated to predict, with fidelity, the skeleton curve of CCA-BRB under cyclic load. The initial elastic stiffness of the brace used in practice should contain overall portions of the brace instead of the yielding portion of the brace. Finally, all the tested CCA-BRBs exhibited a stable energy absorption performance and verified the specimens’ construction was rational.

scholarly journals The Influence of Different Parameter on the Seismic Behavior of SRUHSC Frame

2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Yingchao Ma ◽  
Jinqing Jia
Keyword(s):  
Energy Dissipation ◽  
Failure Mode ◽  
Axial Compression ◽  
Failure Process ◽  
Hysteresis Curve ◽  
Loading Test ◽  
Skeleton Curve ◽  
Shear Span ◽  
Energy Dissipation Capacity ◽  
Seismic Behaviors

The seismic behaviors of steel reinforced ultrahigh strength concrete (SRUHSC) frames with different axial compression ratios and shear span ratios are experimentally studied through the reversed cyclic loading test of four specimens. The test results reveal that the seismic response of the frame is closely related to the failure process and failure mode of the columns. Based on the results, a systematic exploration is further conducted in terms of the characteristics of the skeleton curve, hysteresis curve, strength degradation, stiffness degradation, and energy dissipation capacity of the structure. The results indicate that as the axial compression ratio increases, and the shear span ratio decreases, the failure process of the entire structure and the weakening of the beam end are accelerated. Meanwhile, a change of the failure mode is also observed, accompanied by corresponding changes in the strength, stiffness, and energy dissipation capacity of the system.

scholarly journals Analysis of Cumulative Damage Characteristics of Long Spiral Belled Pile under Horizontal Cyclic Loading at Sea

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Haian Liang ◽  
Hao Zeng ◽  
Kaiwei Cao ◽  
Chao Liu ◽  
Xinjun Cheng
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Power Function ◽  
Cumulative Damage ◽  
Model Parameters ◽  
Function Model ◽  
Load Amplitude ◽  
Cycle Times ◽  
Energy Dissipation Capacity ◽  
Energy Dissipation Coefficient

In order to study the cumulative damage and failure characteristics of long spiral belled pile under horizontal cyclic loading of offshore wind and waves, a series of indoor experiments on single piles under horizontal cyclic load were carried out. The cycle times as well as load amplitude at the same frequency were considered during the horizontal pseudo-static cyclic tests. On the basis of the distribution of pile deflection, bending moment, and Earth pressure around the pile, the pile-soil interaction was comprehensively discussed. The cumulative energy dissipation characteristics were introduced to describe the damage of test piles. Meanwhile, the effects of load amplitude and cycle times on the cumulative damage of long spiral belled piles were discussed. A power function model for energy dissipation coefficient prediction under multi-stage cyclic load was proposed. The results show that the horizontal peak bearing capacity of long spiral belled pile is increased by 57.2% and 40.4%, respectively, as compared with the straight pile and belled pile under the same conditions. The horizontal displacement mainly occurs at the upper part of the pile. Under the condition of limited cyclic times, the load amplitude has more significant effect on the bearing characteristics of the long spiral belled pile. In contrast to the straight pile and belled pile, the long spiral belled pile has better energy dissipation capacity, and the rank of the energy dissipation capacity of these three piles is long spiral belled pile > belled pile > straight pile. The power function model can well reflect the cumulative damage characteristics of long spiral belled pile under horizontal cyclic loading, and there is a good linear relationship between power function model parameters and load amplitude. The energy dissipation coefficient of long spiral belled pile with diverse cycle times at different mechanical stages of test pile is analysed. Then, the recommended power function model parameters according to different failure stages are proposed. The verification example indicates that the prediction results are close to the measured values with a calculation error of 22%. The prediction model can provide a certain reference for the application of long spiral belled pile in marine structures.

scholarly journals Restoring Force Model of an Energy-Dissipation Joint in Hybrid Frames: Simplified Skeleton Curve and Hysteretic Rules

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Yanhua Wang ◽  
Yan Feng ◽  
Dongsheng Huang ◽  
Zirui Huang ◽  
Zhongfan Chen
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Critical Points ◽  
Damping Ratio ◽  
Force Model ◽  
Restoring Force ◽  
Theoretical Derivation ◽  
Skeleton Curve ◽  
Restoring Force Model ◽  
The Moment

In this paper, a restoring force model, composed of a trilinear skeleton curve and hysteretic rules, is proposed based on nine pseudostatic tests of the energy-dissipation joint under horizontal low cyclic loading. The critical points of the simplified skeleton curve are obtained via theoretical derivation and FE simulation. The hysteretic rules for the joints are simplified as a concave hexagon, where the parameters of the critical points are optimized by the genetic algorithm (GA). Using the established trilinear skeleton curve, three different working stages, i.e., elastic, hardening, and softening, were divided by the critical points and the moment stiffness of three stages can be calculated. The proposed hysteretic rules of each stage can reveal and explain the “pinching” in the cyclic loading, which make it easier to understand the mechanism of the energy-dissipation joint. The comparison between the restoring force model and the tests shows that the simplified skeleton curves, the established hysteretic rules, and the ductility and the damping ratio are consistent with the experimental results. Finally, the effectiveness of the established restoring force model is verified.

Hysteretic Performance Analysis of Double-Tube Buckling Restrained Braces with Contact-Ring

2010 ◽  
Vol 163-167 ◽  
pp. 681-685 ◽  
Author(s):  
Zhan Zhong Yin ◽  
Xiu Li Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Energy Dissipation ◽  
The Finite Element Method ◽  
Restoring Force ◽  
Buckling Restrained Brace ◽  
Hysteretic Performance ◽  
Buckling Restrained Braces ◽  
Good Energy ◽  
Force Characteristics

Double-tube buckling restrained braces with contact ring is a new buckling-restrained brace (BRBs), and is a refinement of double-tube buckling restrained braces. Based on the theory of the finite element method, the finite element entity model of double-tube buckling restrained brace with contact-ring has been made. The double-tube buckling restrained braces is systematically analyzed and computed. The analysis results indicate that this kind of buckling restrained brace has good energy dissipation and restoring force characteristics, and can overcome the difficulty in connection.

scholarly journals Research on Dissipation and Fatigue Capacity of Nonstiffener Shear Panel Dampers

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Ji-long Li ◽  
Ya-nan Tang ◽  
Xuan-ming Liu
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Thickness Ratio ◽  
Seismic Action ◽  
Critical Height ◽  
Element Analysis ◽  
Passive Energy Dissipation ◽  
Hysteretic Performance ◽  
Shear Panel ◽  
Shear Panel Damper

Passive energy dissipation control system can effectively control structure response under seismic action. As a form of passive energy dissipation control, yielding steel shear panel dampers can dissipate energy of the ground motion very well with the plastic deformation. By monotonic cyclic loading, hysteretic performance of the 15 mm thick core-board nonstiffener shear panel damper is tested, and the test shows that the damper has a superior hysteretic performance. Using finite element analysis software ABAQUS, and taking height to thickness ratio of the core-board as variable, the qualitative analysis on the damper is carried out, and results show that the critical height to thickness ratio of shear panel damper is between 30 and 35. Three groups of 15 mm thick core-board nonstiffener shear panel dampers are tested by constant amplitude cyclic loading under different amplitudes; the results show that the fatigue performance is fine and the damper is a good energy dissipation device.

Seismic performance of concrete walls reinforced by high-strength bars: cyclic loading test and numerical simulation

2021 ◽  
Author(s):  
Xiangyong Ni ◽  
Shuangyin Cao ◽  
Hassan Aoude
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Numerical Study ◽  
Shear Walls ◽  
High Strength ◽  
Test Results ◽  
3D Fem ◽  
Seismic Behaviour ◽  
Loading Test

This study examines the influence of cross-section shape on the seismic behaviour of high-strength steel reinforced concrete shear walls (HSS-RC) designed with Grade HRB 600 MPa reinforcement. As part of the study, two flexure-dominant walls with rectangular and T-shaped cross-sections, are tested under reversed cyclic loading. Seismic performance is evaluated by studying the failure characteristics, hysteretic curves, energy dissipation, ductility and reinforcing bar strains in the two walls. As part of the numerical study, two-dimensional (2D) and three-dimensional (3D) finite element modelling (FEM) are used to predict the seismic response of the rectangular and T-shaped walls, respectively. The test results show that compared to the rectangular wall, the flange in the T-shaped HSS-RC wall increased strength, energy dissipation and stiffness, but decreased ductility. The analytical hysteretic curves calculated using 2D and 3D FEM analyses show good agreement with the experimental test results.

scholarly journals An Experimental Study on Seismic Performance of Steel Truss Coupling Beams with Buckling-restrained Brace

2015 ◽  
Vol 9 (1) ◽  
pp. 134-139
Author(s):  
Weidong Sun ◽  
Kang Li ◽  
Xinyu Niu
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Hysteresis Curve ◽  
Coupling Beams ◽  
Skeleton Curve ◽  
Static Test ◽  
Plastic Energy ◽  
Buckling Restrained Brace ◽  
Steel Truss ◽  
Curve Skeleton

Through the pseudo-static test on the steel truss coupling beams with buckling-restrained brace, the bearing capacity, deformation capacity, hysteresis curve, skeleton curve, ductility, Energy Dissipation and stiffness degradation of such coupling beam are understood. The test results show that the steel truss coupling beams with buckling-restrained brace is characterized by bigger bearing capacity, higher ductility and good plastic energy dissipation capacity.

scholarly journals Experimental Investigation on the Mechanical Properties of Curved Metallic Plate Dampers

2019 ◽  
Vol 10 (1) ◽  
pp. 269 ◽  
Author(s):  
Jie Zheng ◽  
Chunwei Zhang ◽  
Aiqun Li
Keyword(s):  
Energy Dissipation ◽  
Steel Plate ◽  
Element Model ◽  
Lateral Stiffness ◽  
Initial Stiffness ◽  
Loading Test ◽  
Hysteretic Performance ◽  
Yield Displacement ◽  
Stress Variable ◽  
The Finite Element Model

This study proposes a novel curved steel plate damper to improve the seismic performance of structures. The theoretical analysis of the curved plate damper was carried out deriving formulas of key parameters of the curved plate damper including elastic lateral stiffness, yield strength, and yield displacement. Moreover, a cyclic loading test of four sets of specimens was conducted, and the hysteretic performance, ductility, energy dissipation performance, and strain of the specimens were studied. The results showed that the initial stiffness of the damper was large, no obvious damage was observed, and the hysteresis loop was full. The tested dampers had good deformation and energy dissipation performance. The stress variable rule of the damper was obtained by stress analysis, where the plastic deformation at the end of the semi-circular arc was large. The formula for various parameters of the damper was compared with experimental and numerical results; thus, the value of the adjustment coefficient was determined reasonable. Meanwhile, the rationality of the finite element model was also verified.

Finite Element Analysis of Typical Beam-Column Joints in Yingxian Wood Pagoda

2014 ◽  
Vol 1008-1009 ◽  
pp. 1205-1208
Author(s):  
Jian Long Han ◽  
Guan Feng Qiao ◽  
Qing Fang Niu ◽  
Tie Ying Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Wood Structure ◽  
Vertical Load ◽  
Loading Test ◽  
Element Analysis ◽  
Cyclic Loading Test ◽  
Ancient Wood

Yingxian Wood Pagoda is the highest standing ancient wood structure in China,with four shorter but stiffer storeys hidden between the five apparent storeys. The beam-colunm joints are highly varied. In this study,a model of typical beam-column joints of the pagoda was simulated in Abaqus. The material used in models was similar to the ones of the pagoda.Non-destructive cyclic loading test of the models under different vertical load were conducted.The hysteretic curves underdifferent vertical load were drawn from the test.And the skeleton curves were obtained by linking all peak moment points of each hysteretic loop. The energy –dissipation performance and bending stiffness of models were derived and discussed.

scholarly journals Experimental Study on Hysteretic Behavior of Double-Plate Reinforced Overlapped K-Joints

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Wenwei Yang ◽  
Shuntao Li ◽  
Ruhao Yan ◽  
Yaqi Suo
Keyword(s):  
Plastic Deformation ◽  
Cyclic Loading ◽  
Bearing Capacity ◽  
Failure Modes ◽  
Force Model ◽  
Energy Depletion ◽  
Skeleton Curve ◽  
Hollow Section ◽  
Hysteretic Performance ◽  
Reinforcement Measures

The lifetime of hollow section tubular joints frequently can be shortened owing to the occurrence of the welded cracks and the plastic deformation of chords under the cyclic loading, because of the deficient radial bearing capacity of the steel tube. To avoid such failures, this paper proposes a novel method to strengthen the chord with double plates at the intersection of the chord and braces. To further investigate the efficiency of this strengthening method on hysteretic performance and energy depletion ability of the overlapped K-joints with hollow sections, two unreinforced K-joints and two reinforced K-joints were fabricated. By loading on the braces with collaborative cyclic loading, the joints failure modes, hysteresis curve, and skeleton curve were obtained. The bearing capacity, ductility, and energy depletion of the joints were assessed and the restoring force model of joints was proposed. The results show that the failure mode of the unreinforced joint is the plastic failure of the surface of the chord. For the K-RC1 (double-plate reinforced square hollow section tubular K-joints), cracks appeared at the junction weld between the through brace and the overlapped brace. However, cracks extended along the weld at the intersection of the chord and the through brace for K-CC1 (double-plate reinforced circular hollow section tubular K-joints). There is no obvious deformation on the chord surface of reinforced joints. Experimental results reveal that the mechanical properties of the joints can be improved effectively by such reinforcement measures and that the plastic deformation of the chord can also be restrained. Meanwhile, the reinforcement measures demonstrate the ability to avoid the risk of large stress concentration of the chord in the area where the braces and chords are intersected. The bearing capacity of the joint was increased; however, the ductility of the joint was weakened.

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