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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 61 Abstracts search results
Document:
SP94-31
Date:
July 1, 1987
Author(s):
A. Saxena and E. McEwen
Publication:
Symposium Papers
Volume:
94
Abstract:
A highway bridge pot-bearing system was modeled using nonlinear finite elements to analytically trace the load distribution patterns and failure modes. Material properties for the concrete block supporting the bearing were represented by a modified consti
DOI:
10.14359/1652
SP94-38
W. Koster
The stresses of expansion joints under dynamic aspects are examined. The analysis of dynamic stresses differs explicitly from the customary static examination. A static analysis cannot describe the dynamic actions involved and thus cannot supply a basis f
10.14359/1654
SP94-44
S. Pabst
Elastomeric concrete, when used as a transition medium in the traffic impact area, is a simplistic low-profile concept that vulcanizes permanently to the structural concrete of the bridge deck. This procedure has proven effective in waterproofing the problematic expansion joint areas while providing a unique impact-attenuating transition solution.
10.14359/3419
SP94-46
C. Redfield and C. Seim
What does an engineer do when a defective pot bearing needs replacing? This particular situation was encountered on two recent construction jobs. Several of the pot bearings on the Cline Avenue Project in East Chicago, Ind., needed to be replaced because the elastomer was extruding from the pot. On the I-285 project in Atlanta, Ga., six pot bearings were misaligned and had to be readjusted. The superstructure on both projects was cast in place prestressed concrete box girders. The performance of replacing the pot bearings required designing, fabricating, and installing temporary steel frames, performing special jacking operations, and removing and replacing the pot bearings. This paper describes the operation for both projects in hopes that the solutions illustrated herein may be used by others to help solve similar problems.
10.14359/3425
SP94-49
B. Rogers and D. Shelangoskie
Central to the design of the Intermountain Power Project (IPP) mechanical cooling towers was the ability to configure connections between precast concrete members so that large horizontal seismic forces could be transferred between beams and girders and between girders and columns. Complicating the task of connection design were substantial thermal loads and severe environmental conditions. To solve these and related design questions, a testing program was undertaken using «-scale models of certain key joints in the structure. This paper presents a description of the testing program, a brief description of the structural system in which the joints were located, and the results and conclusions of the tests. Principal among the conclusions is the recognition that embedded metal pins used to transfer forces between discrete members must not only be carefully detailed, but they also must accommodate substantial elastic deformation at the joint if failure below acceptable force levels is to be avoided. In the IPP, this was accomplished by the introduction of a confined viscoelastic medium surrounding the pin. This simple addition to the joint configuration increased the force transferred through the connection by a factor of 2.5 to 3 while limiting deformation to acceptable values.
10.14359/3434
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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