Localized Collapse of Shells of Revolution
A local-global methodology is presented to treat the problems of localized collapse of shells of revolution. The strategy consists of employing two dimensional general shell elements in...

Instability and Plastic Flow of Soils
Materials should according to Drucker's postulate become unstable when the second increment of plastic work is negative. Experimental observations however show otherwise....

Constitutive Relations for Large Deformation Plasticity
Influence of the choice of measures of stress and deformation upon the representation of constitutive relations for elasto-plastic solids undergoing finite deformation is discussed. The...

Geometry of Yield Surfaces for Frictional Flow of Granular Materials
In the frictional flow regime, the discrete particles which compose of granular material roll or slide over one another, maintaining essentially continuous contact. Many theorists, including...

Shear Band Initiation and Evolution in Frictional Materials

Interparticle Sliding and Rolling
Numerical experiments are done with a continuum plasticity program in order to study the initiation and evolution of shear bands. Many elements are used in order to resolve families of...

Marina Refuse and Recycling Facilities
Because of widespread concern regarding the impacts of plastic refuse on marine life, forty-one nations are now party to a treaty which prohibits the disposal of plastics at sea, restricts...

Crossflow vs. Counterflow Air Stripping Costs
Crossflow towers offer a potential economic advantage over counterflow towers due to savings in fan power costs as well as material costs. These savings increase as contaminant volatility...

Small Lysimeters for Documenting Arid Site Water Balance
Small weighing lysimeters consisting of plastic pipes with lifting and drainage fittings were installed at the arid U.S. Department of Energy (DOE) Hanford Site in southcentral Washington...

Evaluation of Thermoplastic Drainage Pipe Designs in Europe and North America
The last 10 years have seen significant increase in the use of plastic pipe for drainage systems in North America in comparison to Europe. Many plastic pipe products have included corrugations,...

Field Fabrication of Reinforced Plastic Pipes
A new technology allows fabrication of reinforced plastic pipe in the field, or the lining of existing pipe. The plastic used can be selected to meet job and site requirements. The reinforcing...

Plastic Highway Bridges
For highway bridges, composites are most effective in cables and decks. Researchers have developed and tested cables and deck sections for strength and fatigue resistance. Link-type cables...

Seismic Analysis and Design of Buried Piping
Among the causes of damage to buried pipelines due to earthquakes, the one that is most complicated to analytically deal with and that is most credible at safety related sites such as...

Hybrid Response Analysis of Buried Corrugated Pipeline Under Seismic Wave
Polyvinyl chloride and polyethylene corrugated pipes are recently used for buried water or sewer pipelines and also used as containers for electric cables. Seismic behavior of these pipelines...

Waste to Energy? The Burning Question
For all their bad press, waste-to-energy plants actually provide a one-two environmental punch—they reduce garbage volume and provide alternative energy. But increasingly, state and local...

Pavement Design by Elastic Layer Theory
The U. S. Army Engineer Waterways Experiment Station has been developing methodology by which airport/airfield pavements can be designed based on elastic layered analysis for the Federal...

Ambiguities and Inanations of Current Plastic Pipe Specifications
This paper discusses current specifications, including materials for plastic pipe as compared to other pipe specifications, including rigid pipe materials. It discusses the ambiguities...

Innovative New Drainage Pipe
Hydraulic tests on corrugated HDPE pipe with a smooth liner show that its Mannings n-value is in the range of 0.009 to 0.015 depending on the smoothness of the liners. With the smooth...

Short-Term Versus Long-Term Pipe Ring Stiffness in the Design of Buried Plastic Sewer Pipes
It is often discussed which pipe ring stiffness should be used when designing the long-term deflection of buried plastic sewer pipes; the short-term value or the long-term value? As the...

Advances in Trenchless Sewer System Reconstruction
The new developments and refinements in trenchless reconstruction technologies now permit total sewer system rebuilding of collectors, interceptors, manholes, service laterals, and force...

 

 

 

 

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