Alaa E. Elwi

University of Alberta

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Co-Authors

Geoffrey L. Kulak

University of Alberta

Gilbert Y. Grondin

Aecom (Canada)

Robert G. Driver

University of Alberta

Khaled Obaia

Syncrude (Canada)

Jianwei Cheng

China University of Mining and Technology

M. Hatzinikolas

Mahbuba Begum

Bangladesh Atomic Energy Commission

T. M. V. Kaiser

Institute of Noetic Sciences

James G. MacGregor

Pfizer (United Kingdom)

Armin Erfanian

Islamic Azad University North Tehran Branch

Cooperative Institutions

University of Alberta

National Research Council Canada

American Society of Civil Engineers

Buckland & Taylor (Canada)

University of Ottawa

University of Calgary

Ministry of Transportation of Ontario

Aecom (Canada)

Alexandria University

University of Illinois Urbana-Champaign

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Tests on Reinforced Partially Prestressed Concrete Tank Walls

Journal of Structural Engineering (2000)

A. Rashed David M. Rogowsky Alaa E. Elwi

Current practice for structural design of environmental concrete structures such as water reservoirs and sewage treatment tanks follows one of two philosophies. The tanks are either fully prestressed or non-prestressed. In one case, the design philosophy is to prevent cracks by keeping the concrete in compression. In the other case, the design philosophy is to allow cracks but limit steel stresses to ensure that the cracks do not become too wide. This paper presents the results of the experimental phase of a research program that aims to investigate the concept of partial prestressing in liquid containment structures. Understanding the behavior of partially prestressed tanks is the key for providing rational solutions ranging from reinforced concrete at one end of the design spectrum to fully prestressed concrete at the other. In the experimental phase, a total of eight full-scale specimens, representing segments from typical tank walls, were subjected to load and leakage tests. The test specimens covered a range of prestressed and non-prestressed reinforcement ratios and were subjected to various combinations of axial tension and bending. Partially prestressed specimens clearly showed improved crack width and distribution under both pure flexure and pure tensile loadings. While the specimens were under load, leakage tests were conducted to obtain leakage rates through the cracks. The flexural compression zone prevented leakage in all specimens tested under flexure. In addition, through-cracks demonstrated autosealing provided the crack widths were below a certain limit. These two aspects are important design parameters that are not explicitly recognized in current design standards.

Prestressed concrete

Leakage (economics)

Tension (geology)

10.1061/(asce)0733-9445(2000)126:6(675)

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Citations (8)

Longitudinally-stiffened large diameter fabricated steel tubes

Journal of Constructional Steel Research (1995)

Qing Chen Alaa E. Elwi Geoffrey L. Kulak

10.1016/0143-974x(94)00040-l

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Citations (3)

Biaxial Tension Stiffening due to Generally Oriented Reinforcing Layers

Journal of Engineering Mechanics (1989)

Richard A. Link Alaa E. Elwi Andrew Scanlon

Panel‐type concrete structures are generally reinforced with more than one layer of steel in different directions. The response of the panels under general states of in‐plane stress is a function of cracking and the degree‐of‐tension stiffening between the cracks. In this paper, a tension‐stiffening model, which accounts for multiple generally oriented reinforcing layers and cracks, is developed. The model is based on an equivalent reinforcing ratio normal to the crack, which maintains strain compatibility with the actual layers. An equivalent stress‐strain relation is developed for the equivalent layer. This relation is used in turn to develop the tension‐stiffening contribution across the crack. The model is implemented in a smeared‐crack concrete constitutive relation of the rotating‐crack type. This model is used within computer program FEPARCS to simulate the response of various panel specimens for which test results are available.

Stiffening

Tension (geology)

Plane stress

10.1061/(asce)0733-9399(1989)115:8(1647)

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Citations (14)

Design of slender shear connected masonry cavity walls

Canadian Journal of Civil Engineering (1997)

Runcong Wang Alaa E. Elwi M. Hatzinikolas

In recent work the writers carried out extensive testing and numerical analysis investigation of slender cavity masonry walls constructed with vertically aligned shear connectors and subjected to eccentric vertical compressive loads. This type of masonry tie has been shown to provide increased stiffness and strength characteristics to the wall system. In this paper a multilinear regression analysis is carried out based on the data generated by that investigation. The effective stiffness of the shear connected cavity walls is evaluated. A design approach for these walls when subjected to eccentric compressive loads is proposed. This design approach makes use of the effective stiffness in the context of the moment magnifier method. It is then verified against the code requirements and available test data by the writers and others.

10.1139/l97-030

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Effect of Modeling on NLFE Analysis of Concrete Structures

Journal of Structural Engineering (1988)

Samanaidu Balakrishnan Alaa E. Elwi David W. Murray

This paper describes a technique of modeling concrete material properties for use in smeared cracking nonlinear finite element analysis of two‐dimensional reinforced concrete structures. The technique is applied to, and the predicted results are compared with, experimental results of 11 concrete beams which include examples both with and without web reinforcement, and for which the shear‐span‐to‐depth ratio varies from 0.5–7. Reasonable correspondence with test results is obtained for all of the six different failure modes exhibited by the test beams. The effect of varying the material parameters on the finite element prediction is examined, and a limited study of the effect of mesh refinement and variation of fracture energy parameters is included. It is concluded that nonlinear finite element analysis has developed to the point where reliable ultimate load analyses of two‐dimensional concrete structures can be carried out.

10.1061/(asce)0733-9445(1988)114:7(1467)

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Citations (24)

Closure to “ Finite Element Model for Curved Embedded Reinforcement ” by Alaa E. Elwi and Terry M. Hrudey (April, 1989, Vol. 115, No. 4)

Journal of Engineering Mechanics (1991)

Alaa E. Elwi T. M. Hrudey

Closure (psychology)

10.1061/(asce)0733-9399(1991)117:3(714.2)

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Citations (2)

Cyclic Test of Four-Story Steel Plate Shear Wall

Journal of Structural Engineering (1998)

Robert G. Driver Geoffrey L. Kulak David Kennedy Alaa E. Elwi

A large-scale, four-story, single bay steel plate shear wall specimen with unstiffened panels was tested using controlled cyclic loading to determine its behavior under an idealized severe earthquake event. The shear wall had moment-resisting beam-to-column connections, resulting in a lateral load-resisting system that possesses an inherent redundancy. Gravity loads were applied at the top of the wall and equal horizontal loads were applied at the four floor levels. The specimen endured 30 cycles of loading during the test, of which 20 cycles were in the inelastic range. Prior to failure of the specimen, the deflection reached in the lowest story was nine times the yield deflection. The test specimen proved to be initially very stiff, showed excellent ductility and energy dissipation characteristics, and exhibited stable behavior at very large deformations and after many cycles of loading. A description of the test setup, loading procedures, and specimen behavior is presented.

10.1061/(asce)0733-9445(1998)124:2(112)

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Citations (360)

Reinforced, Partially Prestressed Concrete Water Tank Walls

ACI Structural Journal (2002)

Abdelaziz Abdo Rashed Alaa E. Elwi David M. Rogowsky

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Prestressed concrete

10.14359/11912

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Citations (4)

Double-Headed Studs in Shear Walls

ACI Concrete International (2005)

Syed Salman. Mobeen Alaa E. Elwi Amin Ghali

Source

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Citations (6)

Numerical Study of Tall Masonry Cavity Walls Subjected to Eccentric Loads

Journal of Structural Engineering (1997)

R. Wang Alaa E. Elwi M. Hatzinikolas

This paper presents the results of the second phase of an ongoing investigation into the behavior of tall cavity masonry walls constructed with partially grouted and reinforced concrete block wythe and a burnt brick wythe tied together with semirigid shear connectors. In the first phase, a test program has been conducted on tall cavity walls under eccentric axial forces. In this phase a nonlinear finite-element analysis model is developed to simulate the database of existing test results. The model represents all components of the cavity wall, the reinforced concrete block backup wythe, the brick wythe, and the shear connectors. It accounts for the nonlinear material behavior of all components as well as the large displacement, small strain characteristics of the deformation. The numerical analysis results are successfully compared with a number of test results. The simulation offers insight into the mode of failure, in particular for walls with high eccentricity ratios. That same model is then used to numerically generate an extensive database to examine the effect of various wall parameters on wall stiffness and ultimate strength.

Cavity wall

Eccentricity (behavior)

Brick

Masonry veneer

10.1061/(asce)0733-9445(1997)123:10(1287)

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Citations (6)