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Ahmed Abdel-Akher

Bio: Ahmed Abdel-Akher is an academic researcher from National Research Council. The author has contributed to research in topics: Cast iron pipe & Factor of safety. The author has an hindex of 3, co-authored 3 publications receiving 34 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a mechanistic model that accounts for cast iron material non-linearity is described, and the model is validated using data obtained from experimental tests conducted in the mid 1930s on undamaged (new) pipes.

22 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigate the behavior of lead-caulked cast-iron pipe joints and estimate the degree of settlement that two or more contiguous segments of a pipe can tolerate before failure.
Abstract: Bell split, in which a shard is separated from the bell end of a bell-spigot joint, is a predominant failure mode (in addition to longitudinal facture) that is observed in lead-caulked bell-spigot joints of large-diameter cast-iron pipes installed between 1850 and the early 1960s. This paper addresses three specific issues related to this type of failure of lead-caulked bell-spigot joints: (1) the extent to which cast-iron pipe joints can rotate without inducing stress in the bell; (2) the behavior of the bell–spigot lead-caulked joints; and (3) an estimate of the degree of settlement that two or more contiguous segments of jointed cast-iron pipe can tolerate before failure. The procedures described in this paper were motivated by the need to understand and explain the circumstances that lead to this failure mode in large-diameter cast-iron pipes. A mechanistic model accounts for lead material nonlinearity, wet and dry joint conditions encountered in water and gas pipelines, respectively, and exis...

13 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined two mechanistic models, one linear and another non-linear, to estimate the levels of hoop stress induced in the bell as a consequence of lead caulking.

5 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the probabilistic risk assessment of gray iron pipes subjected to tunneling is explored, where a modified Gaussian distribution profile is incorporated as displacement-controlled boundary conditions on spring elements.

47 citations

Journal ArticleDOI
TL;DR: In this article, the effect of tunneling-induced ground deformation on the response of jointed cast iron and ductile iron pipelines that cross the settlement profile perpendicular to the torsion point is investigated.
Abstract: This paper focuses on the effect of tunneling-induced ground deformation on the response of jointed cast iron and ductile iron pipelines that (i) cross the settlement profile perpendicular to the t...

42 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed that these buried pipes are subjected to significant stresses due to external (traffic and earth) annealing, and that these pipes used for water and other services are very important lifelines in modern society.
Abstract: Pipelines used for water and other services are very important lifelines in modern society. Commonly, these buried pipes are subjected to significant stresses due to external (traffic and earth) an...

40 citations

Journal ArticleDOI
TL;DR: In this paper, the authors describe the procedure and results of a series of geotec-based geotechnical simulations of large diameter pipes and heavy vehicles, as well as their effects on pipe design.
Abstract: Large-diameter pipes, as well as heavy vehicles, have become increasingly prevalent, which imposes uncertainties on pipe design. This paper describes the procedure and results of a series of geotec...

35 citations

Journal ArticleDOI
TL;DR: In this article, it has been widely noted that most of the damage to the pipelines occurs in the joints where two pipes are connected to each other, and it has also been widely recognized that pipeline water leakage has become a serious problem in many countries.
Abstract: Pipeline water leakage has become a serious problem in many countries. It has been widely noted that most of the damage to the pipelines occurs in the joints where two pipes are connected to each o...

30 citations