Structural Behavior of Buried Plastic Pipe

1974 ◽  
Vol 1 (2) ◽  
pp. 199-207 ◽  
Author(s):  
A. Y. Fagnou ◽  
Karim W. Nasser
Keyword(s):  
External Load ◽  
Laboratory Tests ◽  
Structural Behavior ◽  
Bending Moments ◽  
Vertical Deflection ◽  
Inside Diameter ◽  
Plastic Pipe ◽  
Plastic Pipes ◽  
Loose Soil

This investigation is a study of some of the factors which affect the ability of a plastic pipe to support earth loads. Some of the factors that were considered are the strength of the pipe and the soil conditions.Two series of laboratory tests, using two soil densities, were conducted on two types of plastic pipes that had six wall thicknesses. Deflection gauges were used to measure changes in the inside diameter due to an external load that was applied on the buried specimens.The results indicated that loose soil fill will produce about 70% more vertical deflection in a pipe than dense soil fill. Also, it was observed that vertical deflections can best be assessed by considering the resistence of the pipe to membrane forces rather than bending moments as stipulated in the A.S.T.M. Specifications.

Standardization of Three Efficient Footbridges: Von Mises, Monocontentio and Bicontentio Prototypes.

2021 ◽  
Author(s):  
Mario Guisasola
Keyword(s):  
Boundary Conditions ◽  
Structural Characteristics ◽  
Structural Behavior ◽  
Bending Moments ◽  
Variable Depth ◽  
Constant Depth ◽  
Simply Supported ◽  
Vertical Walls ◽  
Basic Concepts ◽  
Von Mises

<p>The Von Mises, Monocontentio and Bicontentio footbridges are three parameterized metal bridge whose main structural characteristics are their variable depth depending on the applied stress and the embedding of abutments. Its use is considered suitable for symmetrical or asymmetrical topographies with slopes or vertical walls on one or both edges. The footbridges include spans spaced apart by 20 to 66 meters, and are between 2 to 4.5 meters wide.</p><p>Its design is based on five basic concepts: integration in the geometry of the environment; continuous search for simplicity; design based on a geometry that emanates from structural behavior; unitary and round forms; and long- lasting details.</p><p>The structural behavior of these prototypes has been compared with three types of constant-depth metal beams: the bridge simply supported, and the bridge embedded on one or both sides.</p><p>The embedding of abutments, and the adoption of a variation of depth adapted to the bending moments diagrams, allow for more efficient and elegant forms which are well-adapted to the boundary conditions.</p>

Laboratory tests of buried plastic pipes in sand under repeated load

2017 ◽  
pp. 517-522
Author(s):  
S.N. Moghaddas Tafreshi ◽  
O. Khalaj ◽  
J. Khanmohammadi
Keyword(s):  
Laboratory Tests ◽  
Plastic Pipes ◽  
Repeated Load

scholarly journals Fatigue lifetime of a RC bridge along the Carajás railroad

2012 ◽  
Vol 5 (5) ◽  
pp. 627-658
Author(s):  
R. R. F. Santos ◽  
D. R. C. Oliveira
Keyword(s):  
Reinforced Concrete ◽  
Laboratory Tests ◽  
Structural Safety ◽  
Structural Behavior ◽  
Concrete Bridge ◽  
Structural Elements ◽  
Fatigue Lifetime ◽  
Reinforced Concrete Bridge ◽  
Bridge Number

The aim of this paper is to present and discuss the results obtained with a methodology used to characterize the concrete and to evaluate the structural safety against fatigue of the reinforced concrete bridge number 50A located in the Carajás railroad. An "in situ" inspection was carried out in order to assess the evolution of damage in structural elements, with reference to information available in existing projects, calculation memory and reporting of previous inspections. Extractions of concrete testimonies, alkalinity tests, sclerometry, pacometry and laboratory tests were also performed to characterize the materials mechanically and estimate the structural behavior of the bridge under higher future loads.

scholarly journals VERTICAL SUB IRRIGATION

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Alessandro Bozzini
Keyword(s):  
Irrigation Water ◽  
Drip Irrigation ◽  
Table Grape ◽  
Electric Pump ◽  
Water Pipe ◽  
Surface Irrigation ◽  
The Third ◽  
Plastic Pipe ◽  
Plastic Pipes ◽  
Irrigation Pipes

Since millennia, in areas of low rainfall, surface irrigation has been utilized. In 1959 the Israelian inventor Simcha Blass developed a patented very efficient plastic nozzle for dripping the irrigation water from plastic pipes over the crops cultivated soils. In occasion of a FAO project in Libya, this system was utilized for establishing a table grape plantation. In order to support each grape plant, instead of wood poles, plastic pipes of 5 cm diameter, 2.5 mt high were used, dipped into the soil some 50-60 cm, close to each plant. Out of 15 rows, 150 mt long, provided with the normal drip irrigation pipes, in 2 rows a technical modification of “drip irrigation” was used, in which the horizontal water pipe posed on the soil, with holes for dripping the water, was substituted with a normal plastic pipe, without holes, hanged on the plastic vertical poles. In this pipe, close to each grape plant, was made a small hole, in which was inserted a small plastic pipe (like the ones used for blood transfusions). The other side of these mini pipes were inserted into the big vertical plastic pipes used as a support to each plant vegetation, in order to convey the irrigation water deep into the soil. This system has been called “Vertical Subirrigation Technology”. In the summer of the third year of grape cultivation, the electric pump failed and, after a month, only the 2 rows with the modified system did not show any damage. This system was adopted in other FAO projects in the Near East, also for fertile-irrigation.

Reply: Structural Behavior of Buried Plastic Pipe

1975 ◽  
Vol 2 (2) ◽  
pp. 243-243
Author(s):  
A. Y. Fagnou ◽  
Karim W. Nasser
Keyword(s):  
Structural Behavior ◽  
Plastic Pipe
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