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.

Effect of Width-to-Thickness Ratio on Large Deformation in Shear Panel Hysteresis Damper Using Low Yield Point Steel

2013 ◽  
Vol 446-447 ◽  
pp. 1460-1465 ◽  
Author(s):  
Daniel Y. Abebe ◽  
Jae Hyouk Choi ◽  
Si Jeong Jeong
Keyword(s):  
Energy Dissipation ◽  
Large Deformation ◽  
Yield Point ◽  
Seismic Energy ◽  
Thickness Ratio ◽  
Hysteretic Behavior ◽  
Engineering Structures ◽  
Element Analysis ◽  
Energy Dissipating Device ◽  
Shear Panel

Recently, building and other civil engineering structures are built with energy dissipating device in order to reduce the damages caused by earthquake. There are a number of seismic energy dissipating device and steel dampers are among many energy dissipation device which is widely used because they are easy for construction, maintenance and low cost. Shear panel damper (SPD) is a type steel damper that dissipates energy by metallic deformation or using hysteresis of material as a source of energy dissipation. Low yield point steel is a good material to be used as a hysteresis damper since it has excellent ductility performance. Nonlinear finite element analysis was carried out to predict the large deformation and hysteretic behavior of SPD using low yield point steel (SLY120) for different width-to-thickness ratio. In order to verify the analysis simulation, quasi-static loading was also conducted and from the comparison a satisfactory result was found.

Deformation Capacity of Steel Shear Panel Damper and its Reflection to AIJ Design Requirements

2016 ◽  
Vol 11 (1) ◽  
pp. 125-135 ◽  
Author(s):  
Hiroyuki Tamai ◽  
◽  
Kazuhiko Kasai ◽  
Keyword(s):  
Fatigue Life ◽  
Cyclic Loading ◽  
Low Cycle Fatigue ◽  
Thickness Ratio ◽  
Deformation Capacity ◽  
Shear Buckling ◽  
Loading Tests ◽  
Cyclic Loading Tests ◽  
Shear Panel ◽  
Shear Panel Damper

Shear panel dampers consisting of stiffeners and panels surrounded by four flanges are used as aseismic hysteretic dampers for buildings in Japan. Cracks can form easily in a shear panel damper when shear buckling occurs during the cyclic loading caused by a severe earthquake.For a relatively thin panel with a large width-to-thickness ratio, the damper’s plastic deformation capacity and the presence of shear buckling can be evaluated from the maximum deformation angle. However, when it is relatively small, very-low-cycle fatigue life for a relatively thick panel must be known to predict the usage limit of the damper, because the failure pattern changes when cracks form in the weld between the panels and flanges. Fatigue life relations for a thick shear panel damper with parameters of normalized width-to-thickness ratio and deformation angle are presented. A method for predicting the fatigue life under severe earthquake conditions is also presented. To validate the prediction expression, cyclic loading tests were performed on a shear panel damper and reviewed. The applicability of the method for predicting the fatigue life was confirmed through non-stationary cyclic loading tests. These results showed the validity and effectiveness of the expressions and the method.

scholarly journals Experimental Study on Hysteretic Behavior of the Overlapped K-Joints with Concrete Filled in Chord

2019 ◽  
Vol 9 (7) ◽  
pp. 1456 ◽  
Author(s):  
Wenwei Yang ◽  
Ruhao Yan ◽  
Yaqi Suo ◽  
Guoqing Zhang ◽  
Bo Huang
Keyword(s):  
Plastic Deformation ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Bearing Capacity ◽  
Failure Modes ◽  
The United States ◽  
Hysteretic Behavior ◽  
Tensile Failure ◽  
Element Analysis ◽  
Better Than

Due to the insufficient radial stiffness of the steel tube, the cracking of the weld and the plastic deformation of the string often occur under the cyclic loading of the hollow section pipe joint. In order to avoid such a failure, the overlapped K-joints were strengthened by pouring different concrete into the chords. Furthermore, to explore the detailed effect of filling different concrete in a chord on the hysteretic behavior of the overlapped K-joints, six full-scale specimens were fabricated by two forms, which included the circular chord and braces, the square chord and circular braces, and the low cyclic loading tests, which were carried out. The failure modes, hysteretic curves and skeleton curves of the joints were obtained, and the bearing capacity, ductility and energy dissipation of the joints were evaluated quantitatively. The results showed that plastic failure occurs on the surface of the chord of the joints without filling concrete, while the failure mode of the joints filled with concrete in the chords was the tensile failure of the chords at the weld of the brace toe, and the compressive braces had a certain buckling deformation; The strengthening measures of concrete filled with chord can effectively improve the mechanical properties of the K-joints, the delay of the plastic deformation of the chord, and improve the bearing capacity of the K-joints. Contrarily, the ductility coefficient and the energy dissipation ratio of K-joints decreased with the concrete filled in the chord. The hysteretic behavior of the K-joints with a circular chord and brace was slightly better than that of the K-joints with a square chord and circular brace, and the hysteretic behavior of the K-joints strengthened with fly ash concrete, which was better than that of the K-joints strengthened with ordinary concrete. The results of ANSYS (a large general finite element analysis software developed by ANSYS Company in the United States) analysis agreed well with the experimental results.

Numerical modelling of yielding shear panel device for passive energy dissipation

2011 ◽  
Vol 49 (8) ◽  
pp. 1032-1044 ◽  
Author(s):  
Md. Raquibul Hossain ◽  
Mahmud Ashraf ◽  
Faris Albermani
Keyword(s):  
Energy Dissipation ◽  
Numerical Modelling ◽  
Passive Energy Dissipation ◽  
Shear Panel

Finite Element Analysis of Corrugated Mild Steel Damper

2013 ◽  
Vol 671-674 ◽  
pp. 678-683
Author(s):  
Wen Long Shi ◽  
Jin Man Yan ◽  
Xuan Liu
Keyword(s):  
Energy Consumption ◽  
Energy Dissipation ◽  
Mild Steel ◽  
Steel Plate ◽  
Thickness Ratio ◽  
Parameter Study ◽  
Element Analysis ◽  
New Type ◽  
Steel Damper ◽  
Different Thickness

A new kind of mild steel damper which use corrugated plate as energy-intensive steel plate is proposed in this paper. The structures and energy dissipation principles of the new type damper are presented. The hysteretic performances of corrugated mild steel damper with different height-thickness ratio, or with the same height-thickness ratio but with different thickness are analysed by numerical simulation with ABAQUS platform and then parameter study on this kind of damper in detail. The results show that the corrugated steel damper has good and stable energy dissipation performance. The performance of energy consumption increases with the decreasing of height-thickness ratio. When at the same height-thickness ratio, the performance of energy consumption increases with the thickness of energy-intensive steel plate.

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.

Evaluation of yielding shear panel device for passive energy dissipation

2009 ◽  
Vol 65 (2) ◽  
pp. 260-268 ◽  
Author(s):  
Ricky W.K. Chan ◽  
Faris Albermani ◽  
Martin S. Williams
Keyword(s):  
Energy Dissipation ◽  
Passive Energy Dissipation ◽  
Shear Panel

Analytical investigation of the behavior of a new smart recentering shear damper under cyclic loading

2019 ◽  
Vol 31 (4) ◽  
pp. 550-569 ◽  
Author(s):  
Nadia M Mirzai ◽  
Reza Attarnejad ◽  
Jong Wan Hu
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Passive Control ◽  
Shear Failure ◽  
Low Cost ◽  
Residual Deformation ◽  
Friction Damper ◽  
Element Analysis

Shear recentering polyurethane friction damper is a type of passive control device, including the shape memory alloy plates, polyurethane springs, and friction devices. This damper can be employed in the shear link of an inverted Y-shaped braced frame. As the failure mode is a shear failure, in this study, the shear recentering polyurethane friction damper is proposed to remove the residual deformation of the structure that remains after a strong earthquake and causes considerable damage to the structure. The shear recentering polyurethane friction damper can help the structure to return to the initial position. Furthermore, as compared to many other dampers, this new damper is of low cost, and its assembling requires a simple technology. In order to evaluate the performance of the damper, four different cases are considered. Furthermore, the effect of each component is investigated in each case, and a finite element analysis is performed under cyclic loading using the ABAQUS platform. In addition, for the sake of comparison, the shape memory alloy plates are replaced by steel ones, and a comparison for the results demonstrates that the recentering shear dampers can significantly decrease residual deformation, while there is a large amount of residual deformation in the steel damper. Due to using the polyurethane springs, the ultimate capacity of the shear shape memory alloy polyurethane friction damper is 500 kN; however, in the shear steel polyurethane friction damper, it is only about 300 kN. Furthermore, the energy dissipation by the shear shape memory alloy polyurethane friction damper is larger than the shear steel polyurethane friction damper. The results show that the steel plates cannot effectively increase energy dissipation.

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