Shear Panel Damper Research Articles

Hysteresis Characteristics of Shear Panel Damper Using SLY120

Shear panel dampers (SPD) are a type hysteresis damper used in structures to absorb seismic energy whereby damages to the major structural components could be minimized. It dissipates seismic energy by metallic deformation of the panel, welded between two plates called flanges and upper and lower end plates; and fatigue resistance around the welding part. The disadvantage of such dampers is that they absorb seismic energy only when they go through inelastic deformation. To overcome this restriction of hysteretic dampers, low yield strength steel is used as the material for hysteretic damper because low yield point steel 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 (SYP120). The developed nonlinear SPD analysis model was verified with quasi static loading test.

3304 制振パネルダンパの形状最適化手法に関する研究(OS5-5 設計と最適化5,OS5 設計と最適化)

3304 制振パネルダンパの形状最適化手法に関する研究(OS5-5 設計と最適化5,OS5 設計と最適化)

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

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.

Strain Distribution Measurement of a Shear Panel Damper Developed for Bridge Structure

A shear panel damper using low-yield steel is considered as one of cost-effective solutions to reduce earthquake damage to building structure. In this paper, we describe the development of a shear panel damper with high deformation capacity, which is a necessary condition for it to be a bridge bearing. The development is based on the measurement of strain distribution of the shear panels under cyclic loading test. For the measurement, an image processing technique is proposed to use with the two-dimensional finite element method, in which a constant stress triangular element is employed. The accuracy of the measurement is validated by comparing with the results acquired by strain gauges. Various shapes of shear panels are tested in the experiment to obtain the relationship between the strain distribution and the deformation capacity. Based on the results of the experiment, the shear panel damper is improved to achieve high seismic performance with large deformation capacity.

Experimental and Numerical Investigation on the Ultra Large Plastic Deformation Mechanism of Material Application

Low-yield-strength steel shear panel damper (LYSPD) is widely applied to the seismic system by the large plastic deformation capacity and the damping function. It is designed to dissipate the energy result from earthquake or shocking and keep the main structure intact. Although there are several types of dampers made from low-yield-strength steel (LYS) in the world, the ultra large plastic deformation mechanism (ULPM) is not attached importance on by the past researches. Therefore, in order to clarify the ULPM, both the finite element method and the experimental method are conducted for gaining the strain distribution of the LYSPD. The research results show that the ULPM maybe affected by the interlaminar deformation.

Experimental investigation on the low-yield-strength steel shear panel damper under different loading

To evaluate the hysteretic behavior of the low-yield-strength steel shear panel damper (LYSPD) accurately is very important for the dynamic analysis of the structure. Various analytical models for hysteretic behavior of the LYSPD are based on the static experiment results nowadays while it may be affected by dynamic loading speed, loading history and increased temperature. This paper presents a series of static and dynamic experimental investigations for examining the hysteretic behavior of the LYSPD. Obvious difference is observed between static and dynamic hysteretic curves. The test results suggest that the precise description of the nonlinear behavior of the LYSPD under static loading makes no sense. The nonlinear behavior of the LYSPD is replaced by linear strain hardening caused by dynamic loading speed and the perfect elastic–plastic model is more suitable for describing the hysteretic behavior of the LYSPD under dynamic random wave.

Shape optimization of shear panel damper for improving the deformation ability under cyclic loading

This paper presents a shape optimization approach for a low-yield steel shear panel damper to improve the deformation ability. A minimization problem of maximum cumulative equivalent plastic strain, an index of the deformation ability of the shear panel damper is formulated subject to a constraint of total absorbing energy. The response surface methodology as well as the design of experiment technique are applied to the optimization process. In this study, finite element analysis with iso-tropic/kinematic hardening model is adopted to simulate the cyclic elasto-plastic behavior instead of experimental approach, and the numerical solutions are validated by comparing with previous experimental results. With the numerical analysis, the shape parameters effects are investigated and second order polynomials are fitted to obtain the regression equations for the maximum cumulative equivalent plastic strain and the total absorbing energy. The final optimal shape is determined by using the established regression equations. The shape optimization approach can substantially improve the deformation capacity of the shear panel damper.

Research on the dynamic performance of low-yield-strength shear panel damper for bridge application

This study seeks to develop a scientific understanding of the effects of dynamic loading history on the low-yield-strength shear panel damper (LYSPD) mechanical properties and fatigue performance. The LYSPD model is supposed as perfect elastic-plastic without strength deterioration. By adjusting the damper strength with the above supposition in the DYMO software, the serial earthquake response waves of the LYSPD under different soil conditions are obtained firstly. Subsequently, several waves, the most prone to damage at each soil condition, are selected as dynamic loading waves to verify the LYSPD dynamic performances experimentally. The test results suggest that the dynamic loading histories have no influence on the LYSPD strength or the supposed model while they affect the fatigue performance. The applicability and accuracy of three fatigue evaluation methods, cumulative plastic shear strain, cumulative energy absorption and Miner rule, are also compared according to the test results.

Numerical simulation of large deformation in shear panel dampers using smoothed particle hydrodynamics

A shear panel damper (SPD) is commonly used to dissipate energy by metallic deformation in buildings and bridge structures. Consequently, accurate prediction of the deformation behavior of an SPD is very important in controlling the seismic performance of the structure in which it is used. To overcome the limitations of traditional numerical methods for modeling large deformation, a mesh-free particle method called smoothed particle hydrodynamics (SPH) is introduced in this paper. Governing equations in SPH form are proposed; a bilinear model with a kinematic hardening rule and Jaumann stress rate are adopted to establish an SPH model. First, numerical modeling of an elastic simple shear test was carried out to verify the feasibility and reliability of the SPH method. Then, SPD cyclic shear tests were conducted for SPH analysis to extend its applications. SPH modeling can not only accurately simulate large deformation in an SPD, but can also describe the stress–strain relationship and calculate its cumulative dissipated energy subject to cyclic loading. Therefore, the SPH method can reasonably evaluate the properties of an SPD, and provide a scientific basis for their design and incorporation in civil structures in earthquake zones.

Static and dynamic cyclic performance of a low-yield-strength steel shear panel damper

Low-yield-strength steel 100 (LYS100) is widely applied to design a metallic shear panel damper for its high ductility. A low-yield-strength steel shear panel damper (LYSPD) with the maximum shear strain of 70% is developed and verified by static incremental cyclic loading in previous research. In this paper, further research on the performances of the developed LYSPD including the fatigue characteristic is carried out by static and dynamic constant cyclic tests. Four different shear strain amplitudes (20%, 30%, 40% and 50%) are selected in both static and dynamic tests. Two frequencies, 0.5Hz and 1Hz, are adopted for each of the four amplitudes in dynamic tests. Large differences such as stress softening, fatigue cycle deterioration, and temperature increase caused by high strain rate and internal friction are observed in dynamic tests. The test results suggest that the seismic performance of the LYSPD may be overestimated by static tests and the dynamic tests are essential to guarantee the reliability of the LYSPD.

Development of high deformation capacity low yield strength steel shear panel damper

Low yield strength steel 100 is widely applied to design shear panel damper for its high ductility. The practical shear strain of low yield strength steel shear panel damper at present is around 12% while the elongation of the LYS100 tends to go around 60%, which indicates that the ductility of LYS100 has not been fully utilized. To develop function separate damper with LYS100, links of the frame fixture, rib shape and panel shape that affect the deformation capacity of the damper were investigated experimentally. The test results show that the deformation capacity can be improved greatly by alleviating the stress concentration locating at the panel corners. The largest shear strain of 70% is achieved by the optimization on the parameters. The large deformation capacity provides a compact, low-cost alternative to structural designers.

Demand on Stiffened Steel Shear Panel Dampers in a Rigid-Framed Bridge Pier under Repeated Seismic Ground Motions

Destructive earthquakes in recent years show that strong aftershocks are prone to occur frequently, which accelerate the destruction of structures after the main shocks. However, it is difficult to evaluate the intensity of the seismic ground motion by the aftershock. To account for this effect, it is assumed in this study that the structures would sustain three times of severe earthquakes during the service life, and for simplicity the input ground motions are repeated by three times with the same amplitude. Performance requirements on Shear Panel Dampers (SPDs) installed in framed bridge piers under repeated strong earthquakes are examined by dynamic analyses, and the sensitivity of two quantities of the SPD's capacity (maximum shear deformation and cumulative inelastic deformation) is studied. The SPDs are designed to vary on different dimensional and mechanical parameters to be applied in a steel rigid-framed bridge pier, and three kinds of design earthquake motions are used. By comparing the results of three times of earthquakes with that of one time, the performance requirements are concluded and corresponding safety margin of the capacity is discussed for practical seismic design.

1206 繰り返し荷重を受けるせん断型パネルダンパーのリブ形状最適設計(同定・最適化)

1206 繰り返し荷重を受けるせん断型パネルダンパーのリブ形状最適設計(同定・最適化)

J122013 せん断型パネルダンパーの変形能力向上のための形状最適設計

J122013 せん断型パネルダンパーの変形能力向上のための形状最適設計

Seismic Demand on Shear Panel Dampers Installed in Steel-Framed Bridge Pier Structures

This study is aimed at investigating the demand on shear panel dampers (SPDs) installed in steel structures under strong earthquake motions to serve as guidance for the recommended capacity of SPDs in seismic design. For this purpose, an extensive dynamic analysis is carried out on steel bridge pier structures with SPD devices. To describe the restoring force characteristics of SPDs, the analysis uses a newly developed combined hardening model based on experimental data. The seismic demands made on SPD devices are examined and then summarized to give recommended values for determining the necessary deformation capacity of SPDs.

Experimental study on elastoplasticity characteristics of shear panel dampers for long span bridges

Experimental study on elastoplasticity characteristics of shear panel dampers for long span bridges

Study on seismic demand of shear panel dampers used in seismic performance upgrading of steel arch bridges

Study on seismic demand of shear panel dampers used in seismic performance upgrading of steel arch bridges

Study on Hysteretic Behavior of Shear Panel Damper using Low Yield Strength Steel

Study on Hysteretic Behavior of Shear Panel Damper using Low Yield Strength Steel

A study on cyclic behavior and hysteretic model of high-performance stiffened shear panel dampers

A study on cyclic behavior and hysteretic model of high-performance stiffened shear panel dampers

An analytical study on improvement of seismic performance for upper-deck type steel arch bridges by using shear panel dampers

An analytical study on improvement of seismic performance for upper-deck type steel arch bridges by using shear panel dampers