Analytical modelling of a large-scale dynamic testing facility

2011 ◽  
Vol 41 (2) ◽  
pp. 255-277 ◽  
Author(s):  
P. Ceresa ◽  
F. Brezzi ◽  
G. M. Calvi ◽  
R. Pinho
Keyword(s):  
Large Scale ◽  
Dynamic Testing ◽  
Analytical Modelling ◽  
Testing Facility

Large scale dynamic testing of rock support at Kiirunavaara – Improved test design

2016 ◽  
Vol 59 ◽  
pp. 183-198 ◽  
Author(s):  
Shahin Shirzadegan ◽  
Erling Nordlund ◽  
Ping Zhang
Keyword(s):  
Large Scale ◽  
Dynamic Testing ◽  
Test Design ◽  
Rock Support

Behavior of CFST-RC Pier under Different Ground Motions

2018 ◽  
Vol 1145 ◽  
pp. 134-139
Author(s):  
Raghabendra Yadav ◽  
Bao Chun Chen ◽  
Hui Hui Yuan ◽  
Zhi Bin Lian
Keyword(s):  
Earthquake Engineering ◽  
Large Scale ◽  
Dynamic Testing ◽  
Ground Motions ◽  
Dynamic Test ◽  
Longitudinal Direction ◽  
Steel Tube ◽  
Engineering Research ◽  
Magnification Factors ◽  
Time Histories

The dynamic testing of large-scale structures continues to play a significant role in earthquake engineering research. The pseudo- dynamic test (PDT) is an experimental technique for simulating the earthquake response of structures and structural components in time domain. A CFST-RC pier is a modified form of CFST laced column in which CFST members are connected with RC web in longitudinal direction and with steel tube in transverse direction. For this study, a CFST -RC pier is tested under three different earthquake time histories having scaled PGA of 0.05g. From the experiment acceleration, velocity, displacement and load time histories are observed. The dynamic magnification factors for acceleration due to Chamoli, Gorkha and Wenchuan ground motions are observed as 12, 10 and 10 respectively. The frequency of the pier is found to be 1.42 Hz. The result shows that this type of pier has excellent static and earthquake resistant properties.

scholarly journals In Situ Observation of Stress Accumulation during Sub-Merged Arc Welding

2014 ◽  
Vol 996 ◽  
pp. 417-423 ◽  
Author(s):  
Arne Kromm ◽  
Thomas Kannengiesser
Keyword(s):  
Arc Welding ◽  
Large Scale ◽  
X Ray Diffraction ◽  
X Ray ◽  
Residual Stress State ◽  
Testing Facility ◽  
Large Scale Testing ◽  
The Impact ◽  
Stress Accumulation

Results obtained from laboratory tests mostly need to be verified under fabrication conditions in order to incorporate design specifics (joint configuration and restraint), which effect the residual stress state considerably. For this purpose, multi-pass sub merged arc welding was performed in a special large-scale testing facility. The impact of varying interpass temperatures could be proven in-situ by means of a pronounced stress accumulation during welding and subsequent heat treatment accompanied by stress determination using X-ray diffraction.

Large-scale testing facility for cyclic axially loaded piles

2013 ◽  
Vol 6 (3) ◽  
pp. 200-206 ◽  
Author(s):  
Matthias Baeßler ◽  
Werner Rücker ◽  
Pablo Cuéllar ◽  
Steven Georgi ◽  
Krassimire Karabeliov
Keyword(s):  
Large Scale ◽  
Testing Facility ◽  
Large Scale Testing ◽  
Axially Loaded ◽  
Axially Loaded Piles

Circular precast concrete manholes: experimental investigation

2011 ◽  
Vol 38 (3) ◽  
pp. 319-330 ◽  
Author(s):  
Reem Sabouni ◽  
M.H. El Naggar
Keyword(s):  
Large Scale ◽  
Precast Concrete ◽  
Technical Information ◽  
Experimental Program ◽  
Traffic Loading ◽  
Sanitary Sewer ◽  
Testing Facility ◽  
Load Tests ◽  
Geotechnical Testing ◽  
The University

Circular precast concrete manholes are widely used in sanitary sewer and storm water systems. The lack of detailed technical information on them and the conservatism of their governing codes and standards call for a detailed investigation on them. The main objectives of this paper are to evaluate the state of strains in the precast concrete manhole and state of stresses in the soil beneath the base to be used in developing enhanced guidelines for the design of their bases. Three full-scale circular precast concrete manholes, two 1200 mm in diameter and one 1500 mm in diameter, were tested in the large-scale geotechnical testing facility (LSGTF) at the University of Western Ontario. Only one 1200 mm manhole base was reinforced. Twenty seven load tests were performed on the manholes, which involved loads representing the Ontario truck loads incorporated in the Canadian Highway Bridge Code. None of the manhole sections tested in the experimental program experienced any cracks. The test results showed that traffic loading had a small effect on the pressure under the manhole base. All three specimens could withstand the critical Ontario truck loads, even the non-reinforced ones.

Volume Displacement Effects on Pile Capacity in Loose Sand

1973 ◽  
Vol 10 (4) ◽  
pp. 645-647
Author(s):  
Eli I. Robinsky ◽  
Christopher B. H. Cragg
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Loose Sand ◽  
Soil Pressure ◽  
Pile Capacity ◽  
University Of Toronto ◽  
Testing Facility ◽  
Large Scale Testing ◽  
The University ◽  
Displacement Effects

Preliminary tests in the new large-scale testing facility at the University of Toronto reveal that bearing capacity on a pile volume basis is more efficiently developed by a long slender pile or a group of short slender piles than by a pile of larger diameter. The authors attribute this to increased arching in the soil around the pile of greater volume displacement, believing arching buffers the pile from the effects of lateral soil pressure.

scholarly journals Evaluation of Large-Scale Rapid Antigen Testing of Incoming Passengers at a Dynamic Point of Care Setting Carried Out by Dental Students for Covid-19 Screening – A Field Report

2021 ◽  
Vol 10 (33) ◽  
pp. 2734-2739
Author(s):  
Akshay K. Langalia ◽  
Dolly P. Patel ◽  
Aravind D. Kumbhar ◽  
Hetal J. Maheshwari ◽  
Shubhangi K. Vyas ◽  
...  
Keyword(s):  
Large Scale ◽  
Point Of Care ◽  
Dental Students ◽  
Antigen Detection ◽  
Rapid Antigen Detection Test ◽  
Molecular Tests ◽  
Testing Facility ◽  
Field Report ◽  
Antigen Testing ◽  
Central Station

BACKGROUND Assessment of the results of large-scale rapid antigen diagnostic (RAD) testing for detection of SARS-CoV-2 amongst incoming passengers was carried out by Ahmedabad Municipal Corporation (AMC) Dental College Students at the Central Railway Station of Ahmedabad city. We wanted to determine the sensitivity and specificity of RAD testing for detection of Covid-19 amongst passengers disembarking from scheduled trains arriving at the Central Railway Terminus of Ahmedabad city. METHODS Under the campaign “Chase the Virus” launched by Ahmedabad Municipal Corporation (AMC), Interns & Final Year students of AMC Dental College were trained to carry out rapid antigen testing of scheduled trains running on special routes starting from 07 / 09 / 2020 to 05 / 10 / 2020. 14 dental teams were deputed at a temporary testing facility formulated for day-to-day testing at the Central Station using the standalone Standard - Q Covid-19 Ag testing kit (SD Biosensor, South Korea). RESULTS In total, 18901 travellers were tested in a span of 26 days out of which 324 tested positive with an overall percentage positivity of 1.71 %. An average number of 727 (± 182) tests were performed with an overall sensitivity of 66.01 % and specificity of 99.71 %. CONCLUSIONS In response to the growing Covid-19 pandemic and complexity of laboratory-based molecular tests, rapid antigen detection tests have proved to be efficient in the easier and faster diagnosis of the passengers in such point of care settings. KEY WORDS Rapid Antigen Detection Test, Covid-19, SARS-CoV-2

Axial response of piles in electrically treated clay

1999 ◽  
Vol 36 (3) ◽  
pp. 418-429 ◽  
Author(s):  
M Abdel-Meguid ◽  
M H El Naggar ◽  
J Q Shang
Keyword(s):  
High Voltage ◽  
Large Scale ◽  
Axial Loading ◽  
Soil Improvement ◽  
Pullout Capacity ◽  
Axial Capacity ◽  
Testing Facility ◽  
Load Tests ◽  
Pile Load Tests ◽  
Marine Clays

Improvement of the shear strength of soft clayey soils around steel pipe piles using high-voltage electrokinetics is investigated in the present study. The experimental setup of a large-scale testing facility is described. Four model piles were installed in two identical cylinders filled with simulated marine sediment. Five electrically insulated electrodes were installed close to the piles to apply a high-voltage electric field in the test cylinder. Negative direct current voltages of -20, -30, and -10 kV were applied in three phases, respectively, for 33 days in the treatment cylinder. Axial compression and pullout pile load tests were performed and the results were compared for both cylinders after each phase of treatment. The pile response is presented in terms of the experimental load deflection curves. It is observed that the axial capacity was increased 30, 29, and 8% after the first, second, and third treatment phases, respectively. The pullout capacity was increased due to the treatment by 11, 23, and 12% after the first, second, and third treatment phases, respectively. Further development of this technique may provide potential solutions for the improvement of soft marine clays, and ultimately it could be applied in the field to rehabilitate existing offshore foundations.Key words: electrokinetics, piles, marine clays, soil improvement, bearing capacity, axial loading.

Effect of Martensitic Phase Transformation on Stress Build-up during Multilayer Welding

2013 ◽  
Vol 768-769 ◽  
pp. 660-667 ◽  
Author(s):  
Arne Kromm ◽  
Thomas Kannengiesser
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Residual Stresses ◽  
Stress Reduction ◽  
Large Scale ◽  
Filler Materials ◽  
Testing Facility ◽  
On Line ◽  
Multilayer Welding ◽  
The Individual

Innovative low transformation temperature (LTT) welding filler materials are featuring a characteristic chemical composition which favors the formation of martensite at comparatively low temperatures. This permits deliberate adjustment of welding residual stresses. Even though numerous investigations can be found in the literature on this issue, they provide only little insight into the interaction between phase transformation and resulting welding residual stresses. For this purpose, a component weld test was performed in a special large-scale testing facility. The results illustrate that the desired residual stress control by using LTT alloys is actually feasible. With increasing shrinkage restraint, however, higher tensile residual stresses are formed in transverse direction of the weld. By contrast, the residual stress level in longitudinal weld direction is nearly independent of the restraint conditions. On-line stress analysis revealed that the amount of stress reduction during cooling of the individual weld runs is dependent on the weld volume undergoing phase transformation. Overall, evidence was furnished that the approach of residual stress engineering by LTT alloys is suitable even in the case of large-scale multilayer welding.

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