e shaking table array system is composed of multiple shaking tables. In addition to the force in the actuator and the interaction between the shaking table and specimen, the force acting on the shaking table also includes additional force generated by the nonsynchronous output of shaking tables. In this paper, the dual shaking tables with ...
shaking table and that the CSI has an effect on the MST, it is. not accurate to express the RRMS by u 0. The resonance. response of the structure can be expressed by the ra tio of.
The effects of several variables on the performance of a shaking table have been investigated on a laboratory-scale Wilfley table using a synthetic mixture to represent a typical industrial ...
In order to investigate the longitudinal pounding effect of highway bridges with high-piers under strong ground motions, multiple shaking tables tests of a 1/10 scaled continuous rigid frame and simply-supported girder bridge with high-piers were carried out. The pounding responses of the bridge model under different earthquake excitations including the uniform excitation and the
Aug 02, 2017 Shaking Table Motions. Shaker tables, as the name implies, utilized a Shaking action for conveying the refuse and discharging it over the refuse end. The tables were hung from rods attached to overhead supporting beams. A shaft and cam arrangement at one end of the table served as the actuating mechanism and imparted to the table an endwise ...
response of structures by means of shaking tables, it has little effect on the accuracy to which a shaking table can reproduce earthquake-type motions. It was found that foundation compliance affects the frequency response of a shaking table only at low frequencies, and the magnitude iii . of the effect is limited to an amount which depends on ...
Nov 15, 2021 Shaking table test is an important method to study the seismic response of various onshore sites 15, 27. Based on the shaking table tests, this paper presents the influence of the groundwater-level variation on the seismic
Shaking table experiments on two stone masonry buildings, tested before and after grout injection, have been performed. The paper focuses on the analysis of both the recorded accelerations and related displacements, at the bottom and at each further storey. This leads to evaluate the stiffness of the unstrengthened and injected structures.
For the study of the soil-structure interaction, including the effect of lateral spreading, in a saturated sloping ground during earthquake, shaking table tests on a model pile in an inclined large biaxial laminar shear box filled with saturated clean sand were conducted at the National Center for Research on Earthquake Engineering (NCREE), Taiwan.
Theoretical analyses show that the velocity pulse characteristics of ground motions adversely affect structural responses of mega-sub isolation systems. This study presents an extensive shaking table test conducted to investigate the seismic responses of a mega-sub isolation system under near-fault ground motions with velocity pulses.
A series of centrifuge shake table tests were carried out to investigate liquefaction resistance of sand deposits with different fines content. The effects of clayey fines on the generation and dissipation of excess pore water pressure, acceleration record, surface settlement, and stress-strain behavior were investigated.
AbstractIn order to investigate the longitudinal seismic response law of long shield tunnel in consideration of wave-passage effect, taking the Shanghai riverine-passage shield tunnel as a prototype, a series of multi-point shaking table tests were designed and conducted by the multifunctional shaking table array.In consideration of the scale of the actual shield tunnel
Oct 01, 2021 The purpose of the shaking table tests is to study the effects of certain characteristics of near-fault ground motion (intensity and pulse characteristics) on slope instability and failure. The input ground motions are selected from the near-fault region of the same earthquake event (Wenchuan earthquake). In this way, the influence of magnitude ...
This paper presents a study of the effects of shaking history on liquefaction and cone penetration resistance of a clean sand by using 1-g shake table and piezo-cone penetration test (CPTu). A uniform liquefiable clean sand specimen was air-pluviated and saturated in a large laminar shear box. The sand specimen was subjected to four shaking events.
May 01, 1988 An analytical model is developed to evaluate performance characteristics of unidirectional seismic simulators (shaking tables). The validity of the model is verified with experimental measurements of the frequency response of the shaking table at the Catholic University of Peru. Interaction effects between shaking table and structure are first studied
Aug 08, 2021 The rocking effect of a high-rise isolated structure was investigated in this work. To do this, a dynamic model of a high-rise isolated structure considering non-linear tension behaviour of the isolator and the stiffness centre offset was established. ... A shaking table test of the isolated model was conducted and the aspect ratio was found to ...
The effects of damping in various laminated rubber bearings on the seismic response of a 1/8 scale isolated test structure were investigated through shaking table tests 15. The diameter of a lead plug was progressively increased so that a maximum isolator
Mar 21, 2019 In this paper, the effect of shaking history on liquefaction resistance of sand is studied using 1-g shake table testing. A uniform liquefiable sand deposit was air-pluviated and fully saturated in a large laminar shear box (LWH 2.29 m2.13 m1.83 m). The sand deposit was subjected to four different shaking events.
Feb 11, 2017 This paper studies the effect of slope angle on the seismic response of unreinforced and reinforced soil slopes through a series of laboratory shaking table tests. Slopes were constructed using clayey sand and geogrids were used for reinforcing the slopes. The slope angle varies from 45, 60 and 75 in different tests and the quantity and location of
Jun 14, 2019 Ground Movement and Ground Shaking. By Earthquake Hazards June 14, 2019. Overview. Measureable permanent ground displacements are produced by shallow earthquakes of magnitude 5 and greater. These displacements are used by seismologists to understand the earthquake source in detail. Past earthquakes have shown that the
In conclusion, the interaction effects of the shaking table and specimen on the electrohydraulic servo-shaking table system are characterized by a peak-notch distortion in the amplitude-frequency response in a frequency band close to the natural frequency of the specimen.
Interaction effects between shaking table and structure are first studied by analysing the response of a two DOF (degree of freedom) oscillator with mechanical properties representative of the actuator-table-structure system.
Lis the force in the actuator. e shaking table array system is composed of multiple shaking tables. In addition to the force in the actuator and the interaction between the shaking table and specimen, the force acting on the shaking table also includes additional force generated by the nonsynchronous output of shaking tables.
In the process of testing with the multiple shaking tables, the interaction between the shaking tables and specimen affects the output accuracy of the shaking tables. The characteristics and rules of the dual shaking tables-specimen interaction effects on the system performance were analyzed in this paper.
by using wet shaking table for the effective utilisation of the natural resource. In this context, the effect of different process variables such as wash water flow rate, deck tilt angle and feed flow rate has analysed. The interactional effects between different process variables has analysed in terms of 3D response surface plots. It
Jul 09, 2020 The controlstructure interaction is one of the most important reasons for the degradation of the control performance of the shaking table. This article establishes a series of novel analytical models to investigate the controlstructure interaction effects between double shaking tables and test structure.
A properly operating shaking table is one of the most efficient units in mineral processing even with its low unit capacity it still finds significant application in various sectors of the...
Although the peak and notch effect may cause difficulties in determining the frequency response of structures by means of shaking tables, it has little effect on the accuracy to which a shaking table can reproduce earthquake-type motions.
KEY WORDS Shaking table test Rocking system Base plate Earthquake response reduction Smart structure 1. INTRODUCTION It is pointed out that effects of rocking vibration (up-lifting response) can reduce the seismic damage of buildings subjected to strong earthquake ground motions 12. Based on this knowledge, we are now developing the rocking
Shaking tables are one of the oldest gravity separators in the mineral processing industry, capable of handling minerals and coal of 0-2mm. Shaking tables are rectangular-shaped tables with riffled decks across which a film of water flows. The mechanical drive imparts motion along the long axis of the table, perpendicular to the flow of the water.
effects of vibration of soil deposits and buildings, a scaled mode1 of building, foundation, and soil deposit is set up on a shaking table. Through analyzing difference between response of foundation without buildings, and surface grounds under the steady state
Shaking table tests on effect of tire chips and sand mixture in increasing liquefaction resistance and mitigating uplift of pipe Taro Uchimura, Nguyen Anh Chi, Shanmugaratnam Nirmalan, Takuya Sato, Mehrashk Meidani, Ikuo Towhata The University of Tokyo, Tokyo, Japan ABSTRACT The authors propose to use a mixture of tire chips and sand as backfill material for buried pipes.
Based on the test data of shaking table tests of subway station structure in soft ground under both near-field and far-field earthquakes, the spatial effects of peak ground acceleration (PGA) of soft ground as well as peak strain response of the subway station structure are analyzed. The results show that the peak acceleration of measuring points on both major and
top of a shaking table model of 600 mm long and 400 mm high. Nowadays, studies in this particular field are carried out by using advanced shaking tables, which allow large models and diverse waves to be investigated (Liang et al. 2005 Dong et al. 2011 Ye et al. 2013). In the present study, a shaking table with six
Oct 13, 2021 Full-scale shake table testing was conducted to evaluate the seismic performance of single and grouped helical piles. Eight circular and one square helical piles with different properties including length, radius and number of helices, as well as one driven circular pile were installed in dry sand enclosed in a laminar soil shear box that was situated on the shaking table.
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