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Bending stresses: imposed on underground small diameter lines in city streets

Journal Article:

Abstract

Die Technischen Werke der Stadt Stuttgart AG (TWS, Stuttgart) investigated the accuracy of available bending stress calculations to represent the actual stress exerted on underground pipelines, the effective bending intervals, and the pipe diameter required to effectively resist the expected stress. The investigation covers steel, cast iron, ductile cast iron, asbestos cement, and PVC 100. The theoretical stresses were determined by the Boussinesgne method from the effects of SLW60 vehicles on pipes buried 3.28 ft (1 m) underground. The cumulative load on the pipe was obtained as the total of the vehicle load, soil load, pipe load, and water load. Results indicate that the tensile stress from internal pipe pressure can be omitted, and that welded steel and sealed PVC pipes should account for longitudinal tensile stresses. Steel pipes are generally so oversized that they need not account for these stresses. The calculations also considered the interaction between the pipe and pipe joint as the pipe emerges from the trench for the 3 possible conditions: an overhang beam, a beam encased at one end and jointed at the other, and a beam, encased at both ends. The curves of the resisting moments varied according to the type of material and  More>>
Authors:
Publication Date:
May 01, 1975
Product Type:
Journal Article
Reference Number:
EDB-84-137393
Resource Relation:
Journal Name: Gaz Aujourd'hui; (France); Journal Volume: 99
Subject:
03 NATURAL GAS; 36 MATERIALS SCIENCE; CAST IRON; STRESSES; TENSILE PROPERTIES; CEMENTS; PIPELINES; PVC; STEELS; BENDING; COMPARATIVE EVALUATIONS; DIMENSIONS; PIPES; STRESS ANALYSIS; TEMPERATURE EFFECTS; UNDERGROUND; URBAN AREAS; ALLOYS; BUILDING MATERIALS; CARBIDES; CARBON COMPOUNDS; CHLORINATED ALIPHATIC HYDROCARBONS; HALOGENATED ALIPHATIC HYDROCARBONS; IRON ALLOYS; IRON BASE ALLOYS; IRON CARBIDES; IRON COMPOUNDS; LEVELS; MATERIALS; MECHANICAL PROPERTIES; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC POLYMERS; POLYMERS; POLYVINYLS; TRANSITION ELEMENT COMPOUNDS; 032000* - Natural Gas- Transport, Handling, & Storage; 360103 - Metals & Alloys- Mechanical Properties; 360603 - Materials- Properties; 360403 - Materials- Polymers & Plastics- Mechanical Properties- (-1987)
OSTI ID:
6938679
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Journal ID: CODEN: GAZJA
Submitting Site:
HEDB
Size:
Pages: 151-158
Announcement Date:

Journal Article:

Citation Formats

Kottmann, A. Bending stresses: imposed on underground small diameter lines in city streets. France: N. p., 1975. Web.
Kottmann, A. Bending stresses: imposed on underground small diameter lines in city streets. France.
Kottmann, A. 1975. "Bending stresses: imposed on underground small diameter lines in city streets." France.
@misc{etde_6938679,
title = {Bending stresses: imposed on underground small diameter lines in city streets}
author = {Kottmann, A}
abstractNote = {Die Technischen Werke der Stadt Stuttgart AG (TWS, Stuttgart) investigated the accuracy of available bending stress calculations to represent the actual stress exerted on underground pipelines, the effective bending intervals, and the pipe diameter required to effectively resist the expected stress. The investigation covers steel, cast iron, ductile cast iron, asbestos cement, and PVC 100. The theoretical stresses were determined by the Boussinesgne method from the effects of SLW60 vehicles on pipes buried 3.28 ft (1 m) underground. The cumulative load on the pipe was obtained as the total of the vehicle load, soil load, pipe load, and water load. Results indicate that the tensile stress from internal pipe pressure can be omitted, and that welded steel and sealed PVC pipes should account for longitudinal tensile stresses. Steel pipes are generally so oversized that they need not account for these stresses. The calculations also considered the interaction between the pipe and pipe joint as the pipe emerges from the trench for the 3 possible conditions: an overhang beam, a beam encased at one end and jointed at the other, and a beam, encased at both ends. The curves of the resisting moments varied according to the type of material and pipe diameter, with the greatest rate increase reported for asbestos cement, followed by PVC 100, cast iron, ductile cast iron, and steel. Operating data of a cast-iron underground TWS system in Stuttgart indicated that pipes with less than or equal to 4 in. ( less than or equal to 100 mm) nominal diameter were quite fragile while those with diameters >6 in. (>105 mm) sustained considerably less damage. The degree of damage was found to decrease with increasing diameters. The effect of temperature also proved important. Since it is not economically possible to reinstall the distribution lines with 8-in. (200-mm) pipes, elastic support systems such as crossing troughs are recommended to support the pipes in stress areas.}
journal = {Gaz Aujourd'hui; (France)}
volume = {99}
journal type = {AC}
place = {France}
year = {1975}
month = {May}
}