scholarly journals ENERGY DISSIPATION BEHAVIOURS AND SEISMIC REDUCTION PERFORMANCE OF A PROPOSED VELOCITY AND DISPLACEMENT DEPENDENT HYDRAULIC DAMPER (VDHD)

2010 ◽  
Vol 16 (3) ◽  
pp. 428-438 ◽  
Author(s):  
Wen-Pei Sung ◽  
Ming-Hsiang Shih ◽  
Yu-Kuang Zhao
Keyword(s):  
Energy Dissipation ◽  
Shaking Table Test ◽  
Maxwell Model ◽  
Friction Model ◽  
Shaking Table ◽  
Analysis Model ◽  
Relief Valve ◽  
Hydraulic Damper ◽  
Superior Effect ◽  
Simulation Results

A new oil‐pressure Velocity and Displacement Dependent Hydraulic Damper (VDHD) is proposed by adding an additional Relief Valve parallel to the Throttle Valve with a different aperture size. This objective is to obtain an adaptive control by changing the damping coefficient of the VDHD for better control of structural movement during earthquake. In order to simulate its actual energy elimination, a mathematical analysis model is developed based on the Maxwell Model, which is modified by adding a serial friction model and a small damper parallel to the friction model in this study. The mathematical simulated results are compared with the actual energy‐dissipating behaviours of this proposed damper. The comparison shows that this proposed mathematical modelling could accurately simulate the relation of force and displacement as well as the relation of force and velocity during the process of energy dissipation. In addition, results of both the laboratory shaking table test and simulation analyses are used to test and verify the seismic reduction performance of this proposed damper. The experimental and simulation results show that in spite of the magnitude of the earthquake, the proposed VDHD device has a superior effect on the control of structural displacement by achieving effective acceleration reduction. Santrauka Siūlomas naujas hidraulinis i greiti ir poslinki reaguojantis slopintuvas (HGPS), sukurtas prie droselinio vožtuvo su kintama apertūra pridejus atbulini vožtuva. Buvo siekiama užtikrinti geresne adaptyvia konstrukcijos judejimo žemes drebejimo metu kontrole keičiant HGPS slopinimo koeficienta. Norint modeliuoti tikraji energijos pašalinima, buvo sukurtas matematinis modelis, pagristas Maksvelo modeliu. Šis modelis buvo pakeistas prie trinties modelio pridejus nuosekluji trinties modeli ir nedideli slopintuva. Matematinio modeliavimo rezultatai lyginami su tikraja siūlomo gesintuvo energijos sklaida. Palyginimas rodo, kad matematinio modeliavimo rezultatai atitinka tikraja siūlomo gesintuvo elgsena. Lyginant skaičiavimo rezultatus su eksperimentiniais matyti, kad siūlomas matematinis modeliavimas leidžia tiksliai išreikšti jegos ir poslinkio bei jegos ir greičio ryšius, susidarančius energijos sklaidos metu. Laboratoriniai rezultatai, gauti naudojant vibracini stala, ir modeliavimo rezultatai taikomi tirti bei tikrinti siūlomo gesintuvo itaka mažinant seismines konstrukcijos charakteristikas. Eksperimentiniai ir modeliavimo rezultatai rodo, kad nepaisant žemes drebejimo laipsnio, siūlomas gesintuvas labai pagerina konstrukcijos poslinkiu kontrole efektyviai mažindamas judejimo pagreiti.

Comparative Analysis of Hydraulic Energy-Dissipation Damper Performance Based on AMESim

2014 ◽  
Vol 496-500 ◽  
pp. 881-886
Author(s):  
Min Zhang ◽  
Hong Kun Wang ◽  
Xue Song Qian
Keyword(s):  
Energy Consumption ◽  
Comparative Analysis ◽  
Energy Dissipation ◽  
Performance Parameters ◽  
Relief Valve ◽  
Engineering Structures ◽  
Hydraulic Damper ◽  
Throttle Valve

This paper mainly introduces three types of hydraulic energy-dissipation dampers, which adopts the damping hole, relief valve, and relief throttle valve, and the structures, operation principles and energy dissipation mechanisms in detail. Using AMESim to analyze the performance parameters comparatively, it can be concluded that the hydraulic damper adopting relief valve has strong capability of energy consumption and effectively ensures the safety of engineering structures.

Dynamic Experiments on a 1/4 Scale New-Styled Korean Traditional Wooden House

2014 ◽  
Vol 598 ◽  
pp. 743-746 ◽  
Author(s):  
Yeong Min Kim
Keyword(s):  
Natural Frequency ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Test Model ◽  
Dynamic Tests ◽  
Analysis Model ◽  
Dynamic Experiments ◽  
Wooden House ◽  
Scale Test ◽  
The Impact

This research performed dynamic tests on a 1/4 scale test model of a new-styled Korean traditional wooden house to study its dynamic characteristics. The dynamic tests were performed both by the impact hammer test and the shaking table test of an El-centro N-S seismic wave. Together with these dynamic tests, structural analysis was also performed and the results were compared. The natural frequency from the impact hammer test was slightly higher than that from the shaking table test. The natural frequency from the eigenvalue analysis was about 16~33% lower than that from both the impact hammer test and the shaking table test. It can be deduced that the rotational stiffness of joints of analysis model were somewhat underestimated than those of experiment model.

Upgrading of isolated bridges with space-bar energy-dissipation devices: Shaking table test

2021 ◽  
pp. 136943322110139
Author(s):  
Jelena Ristic ◽  
Zoran Brujic ◽  
Danilo Ristic ◽  
Radomir Folic ◽  
Milos Boskovic
Keyword(s):  
Energy Dissipation ◽  
Large Scale ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Hysteretic Behavior ◽  
Experimental Program ◽  
Bridge Model ◽  
Shaking Table Testing ◽  
Energy Dissipation Devices ◽  
Isolated Bridges

The results of the experimental research program realized on a bridge model constructed by using the seismically isolated system upgraded with space-bar devices (USI-SB) are presented in the paper. The installed adaptable system for seismic protection of bridges utilizes double spherical rolling seismic bearings (DSRSB) as seismic isolators, while the qualitative improvement of seismic performances is achieved through the use of novel adjustable multi-directional space-bar energy dissipation (SB-ED) devices. The experimental program consisted of quasi-static testing of isolation and energy dissipation devices under the cyclic loading and extensive shaking-table testing of a large-scale bridge model with installed USI-SB system. For both types of devices, a very stable all-directional response during cycling tests, as well as the favorable hysteretic behavior of the energy dissipation devices along the entire range of applied large displacements were registered. In the dynamic testing, the system showed high seismic response modification performances needed for the efficient protection, exhibiting its large potential in the qualitative improvement of seismic performances of isolated bridges.

scholarly journals Simplified Analytical Model and Shaking Table Test Validation for Seismic Analysis of Mid-Rise Cold-Formed Steel Composite Shear Wall Building

2018 ◽  
Vol 10 (9) ◽  
pp. 3188 ◽  
Author(s):  
Jihong Ye ◽  
Liqiang Jiang
Keyword(s):  
Energy Dissipation ◽  
Shaking Table Test ◽  
Time History ◽  
Shear Wall ◽  
Shaking Table ◽  
Simplified Model ◽  
Composite Shear Wall ◽  
New Material ◽  
Composite Shear ◽  
Floor System

To develop the cold-formed steel (CFS) building from low-rise to mid-rise, this paper proposes a new type of CFS composite shear wall building system. The continuous placed CFS concrete-filled tube (CFRST) column is used as the end stud, and the CFS-ALC wall casing concrete composite floor is used as the floor system. In order to predict the seismic behavior of this new structural system, a simplified analytical model is proposed in this paper, which includes the following. (1) A build-up section with “new material” is used to model the CFS tube and infilled concrete of CFRST columns; the section parameters are determined by the equivalent stiffness principle, and the “new material” is modeled by an elastic-perfect plastic model. (2) Two crossed nonlinear springs with hysteretic parameters are used to model a composite CFS shear wall; the Pinching04 material is used to input the hysteretic parameters for these springs, and two crossed rigid trusses are used to model the CFS beams. (3) A linear spring is used to model the uplift behavior of a hold-down connection, and the contribution of these connections for CFRST columns are considered and individually modeled. (4) The rigid diaphragm is used to model the composite floor system, and it is demonstrated by example analyses. Finally, a shaking table test is conducted on a five-story 1:2-scaled CFS composite shear wall building to valid the simplified model. The results are as follows. The errors on peak drift of the first story, the energy dissipation of the first story, the peak drift of the roof story, and the energy dissipation of the whole structure’s displacement time–history curves between the test and simplified models are about 10%, and the largest one of these errors is 20.8%. Both the time–history drift curves and cumulative energy curves obtained from the simplified model accurately track the deformation and energy dissipation processes of the test model. Such comparisons demonstrate the accuracy and applicability of the simplified model, and the proposed simplified model would provide the basis for the theoretical analysis and seismic design of CFS composite shear wall systems.

scholarly journals Seismic Performance Evaluations of Mega-Sub Isolation System

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Xiangxiu Li ◽  
Ping Tan ◽  
Xiaojun Li ◽  
Aiwen Liu
Keyword(s):  
Numerical Simulation ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Isolation System ◽  
Test Models ◽  
Story Drift ◽  
Structural Responses ◽  
Simulation Results ◽  
Dynamic Time ◽  
Better Than

This paper presents mega-sub isolation system. Shaking table test of the mega-sub isolation system is carried out in this paper. Three test models have been developed. One is called aseismic model, in which all the substructures are fixedly connected with the megastructures. The second one is known as isolated model, where the substructures are connected with the megastructures with isolators, and the last one is called the lower substructure consolidated (LSC) model, in which all the substructures except for the substructures at the lowest level, in other words, substructures at the second mega floor, are isolated from the megastructures. Nonlinear dynamic time analysis of the test models is conducted by SAP2000. Acceleration responses of the megastructure, story drift responses of the megastructure and the substructure, and the deformations of the isolation layer are compared between experimental and numerical simulation results. The results show that the experimental results and numerical simulation results agree well with each other, and the isolated model and LSC model perform better than the counterpart aseismic model. The structures with isolation devices can reduce the structural responses effectively and are much safer than the structure without isolation devices.

scholarly journals Shaking Table Test Study on Seismic Performance of Hollow Rectangular Piers

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Yanli Shen ◽  
Bo Wei
Keyword(s):  
Energy Dissipation ◽  
Ground Motion ◽  
Axial Compression ◽  
Seismic Performance ◽  
Compression Ratio ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Magnification Factor ◽  
Axial Compression Ratio ◽  
Dynamic Magnification Factor

To study the seismic performance of hollow reinforced concrete piers under dynamic loads, nine hollow pier specimens with different stirrup ratios, reinforcement ratios, and axial compression ratios are designed and manufactured. The El Centro wave, Taft wave, and artificial Lanzhou wave are selected as seismic excitation for the shaking table test. The effects of the reinforcement ratio, stirrup ratio, and axial compression ratio on the failure mode, period, damping, acceleration and displacement response, dynamic magnification factor, ductility, and energy dissipation of specimens under different working conditions are studied. The results show that all the nine reinforced concrete piers have good seismic performance. Subjected to ground motion excitation, horizontal through cracks appeared on the pier surface. With the increase of ground motion excitation, the period of piers increases but the maximum period does not exceed 0.62 s, and the damping ratio increases as well and ranges from 0.02 to 0.064. With the increase of the ground motion excitation, the acceleration response of pier specimens increases, the dynamic magnification factor decreases, the displacement ductility coefficient decreases, and the energy dissipation of the specimens increases. The reinforcement ratio, stirrup ratio, and axial compression ratio have different effects on the above parameters. The test results can provide reference for seismic design of hollow rectangular piers and have certain engineering significance and value.

scholarly journals Numerical Analysis on the Seismic Performance of Plane Irregular Structure Based on ABAQUS

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Lina Zong ◽  
Feng Xu ◽  
Wei Yuan ◽  
Xiaolei Ji
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Shell Element ◽  
Element Model ◽  
Shaking Table ◽  
Analysis Model ◽  
Finite Element Software ◽  
Open Hole

Rod element and shell element were used in finite element software ABAQUS to establish dynamic elastic-plastic analysis model of the structure, the seismic performance of an irregular plane complex overrun structure numerical simulation, the structure was calculated under different input level and displacement response of the acceleration response, and analyses the force of the wear layer column and the floor of the open hole stress level. The results were compared with the shaking table test to verify the accuracy of the numerical simulation results. The results of numerical calculation were basically consistent with the experimental results, and the finite element model basically reflected the response of the structure under the simulated earthquake.

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