A Database for the Experimental Study of Earthquake-Induced Liquefaction and Lateral Spreading in Sands

2016 ◽  
Vol 32 (2) ◽  
pp. 1261-1279
Author(s):  
Tarek Abdoun ◽  
Waleed El-Sekelly ◽  
Ricardo Dobry ◽  
Sabanayagam Thevanayagam ◽  
Marcelo Gonzalez
Keyword(s):  
Large Scale ◽  
Rensselaer Polytechnic Institute ◽  
Lateral Spreading ◽  
Soil Behavior ◽  
Centrifuge Testing ◽  
Geotechnical Centrifuge ◽  
Testing Facility ◽  
Large Scale Testing ◽  
Materials Used ◽  
The University

Centrifuge and large-scale testing in geotechnical engineering are very useful tools for modeling soil behavior under different loading conditions, particularly under earthquake loading. The paper presents an extensive database of nine centrifuge and large-scale liquefaction experiments performed both at the geotechnical centrifuge testing facility at Rensselaer Polytechnic Institute (RPI) and the large-scale testing facility at the University at Buffalo (UB). The database described herein was generated using the NEEShub online DataStore tool under the name “CENSEIS: Centrifuge and Large (Full)-Scale Modeling of Seismic Pore Pressures in Sands” (DOI: http://dx.doi.org/10.4231/D3GF0MX4F ). The paper discusses the tools and materials used in the experiments along with an explanation of each item in the database. Sample analyses are also presented in the paper to give an insight on the capabilities of the database for numerical and analytical applications. The paper is concluded with some possible applications along with tips and limitations of the database.

Preshake: A Database for Centrifuge Modeling of the Effect of Seismic Preshaking History on the Liquefaction Resistance of Sands

2016 ◽  
Vol 32 (3) ◽  
pp. 1925-1940 ◽  
Author(s):  
Waleed El-Sekelly ◽  
Tarek Abdoun ◽  
Ricardo Dobry
Keyword(s):  
Sandy Soils ◽  
Rensselaer Polytechnic Institute ◽  
Centrifuge Modeling ◽  
Polytechnic Institute ◽  
Liquefaction Resistance ◽  
Centrifuge Testing ◽  
Geotechnical Centrifuge ◽  
Analytical Applications ◽  
Testing Facility ◽  
Materials Used

Several researchers found that the behavior of natural preshaken soils can be very different from artificial recent fills. This paper presents an extensive database of two very long centrifuge experiments (CS-5-1-1 and CC-5-1-1) performed both on silty and clean sand at the geotechnical centrifuge testing facility at Rensselaer Polytechnic Institute (RPI). The two experiments test the effect of seismic preshaking history on the liquefaction resistance of sandy soils. The database described herein was generated using the NEEShub online DataStore tool under the name “PRESHAKE: Centrifuge modeling of the effect of seismic preshaking on the liquefaction resistance of sands” (DOI: http://dx.doi.org/10.4231/D38K74X78 ). The paper discusses the tools and materials used in the experiments along with an explanation of each item in the database. Sample analyses are also presented in the paper to give an insight on the capabilities of the database for numerical and analytical applications. The paper is concluded with some possible applications along with tips and limitations of the database.

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 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.

A Numerical Investigation Into the Bottom Boundary Effect for Spudcan Penetration on Sand Overlying Clay in Centrifuge Test

2012 ◽  
Author(s):  
Shah Neyamat Ullah ◽  
Yuxia Hu
Keyword(s):  
Layer Thickness ◽  
Large Scale ◽  
Boundary Effect ◽  
Small Strain ◽  
Sand Layer ◽  
Centrifuge Test ◽  
Bottom Boundary ◽  
Centrifuge Testing ◽  
Soil Failure ◽  
Large Scale Testing

In the last two decades centrifuge testing of geomaterials to meet offshore design has gained momentum. In the absence of large scale testing this technique with all its versatility has been successfully used for many offshore applications encompassing spudcan foundation, anchors, caissons, piles etc. Although many real soil failure characteristics can be replicated in the centrifuge, the centrifuge strong box may constrain the testing range when large displacement of spudcan foundation needs to be tested, especially in multiple layer soils. The paper investigates the rigid bottom boundary effect of the centrifuge strong box during large penetration of spudcan foundation into sand over clay soil profiles. Large deformation finite element (LDFE) method incorporating RITSS (Remeshing and Interpolation Technique using Small Strain) approach has been adopted for numerical simulation of the problem. With fixed vertical space available, the effects of sand layer thickness, sand friction and dilation angles have been studied. The LDFE/RITSS method was validated by existing centrifuge test data. It was observed that, during spudcan penetration, the development of sand plug trapped beneath the spudcan played a crucial role in the bottom boundary effect. The boundary effect started earlier when the ratio of sand layer thickness to spudcan diameter was greater than unity.

Large-scale testing facility for heavy haul track

2021 ◽  
Vol 28 ◽  
pp. 100517
Author(s):  
Buddhima Indraratna ◽  
Trung Ngo ◽  
Fernanda Bessa Ferreira ◽  
Cholachat Rujikiatkamjorn ◽  
Ameyu Tucho
Keyword(s):  
Large Scale ◽  
Testing Facility ◽  
Large Scale Testing ◽  
Heavy Haul

SOCIAL PROJECT AS A PLATFORM FOR THE IMPLEMENTATION OF PROFESSIONAL SKILLS OF FUTURE INFORMATICS TEACHERS

2019 ◽  
pp. 16-22
Author(s):  
E. V. Klimenko ◽  
N. S. Buslova
Keyword(s):  
Large Scale ◽  
Modern Society ◽  
Professional Competencies ◽  
Future Teachers ◽  
Professional Skills ◽  
Knowledge And Skills ◽  
Theoretical Reasoning ◽  
Social Project ◽  
The University

The article is devoted to the consideration of ways to solve one of the actual problems in theory and methodology of training and upbringing — the problem of developing professional skills of future informatics teacher. As a way to adapt students to the profession, the possibility of their involvement in social designing was chosen. Participation in social projects contributes to the approbation and introduction of new forms and methods in teaching informatics. Expanding the experience of future teachers in carrying out large-scale events contributes to the formation of a socially adapted personality competitive in modern society. The potential of a social project in consolidating the knowledge and skills obtained during the theoretical training at the university is indicated. In the article, theoretical reasoning is accompanied by examples of real social projects and activities aimed at the formation of professional competencies of future informatics teachers.

Disruptive innovation and operationalization in local and sustainable food systems: Examining the University of Toronto-Local Food Plus partnership

2019 ◽  
Vol 6 (1) ◽  
pp. 120-139
Author(s):  
Lori Stahlbrand
Keyword(s):  
Food Systems ◽  
Large Scale ◽  
Food System ◽  
Local Food ◽  
Disruptive Innovation ◽  
Government Support ◽  
Sustainable Food ◽  
University Of Toronto ◽  
The University

This paper traces the partnership between the University of Toronto and the non-profit Local Food Plus (LFP) to bring local sustainable food to its St. George campus. At its launch, the partnership represented the largest purchase of local sustainable food at a Canadian university, as well as LFP’s first foray into supporting institutional procurement of local sustainable food. LFP was founded in 2005 with a vision to foster sustainable local food economies. To this end, LFP developed a certification system and a marketing program that matched certified farmers and processors to buyers. LFP emphasized large-scale purchases by public institutions. Using information from in-depth semi-structured key informant interviews, this paper argues that the LFP project was a disruptive innovation that posed a challenge to many dimensions of the established food system. The LFP case study reveals structural obstacles to operationalizing a local and sustainable food system. These include a lack of mid-sized infrastructure serving local farmers, the domination of a rebate system of purchasing controlled by an oligopolistic foodservice sector, and embedded government support of export agriculture. This case study is an example of praxis, as the author was the founder of LFP, as well as an academic researcher and analyst.

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