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International Concrete Abstracts Portal

Showing 1-5 of 27 Abstracts search results

Document: 

SP215-03

Date: 

August 1, 2003

Author(s):

G. P. Terrasi and J. M. Lees

Publication:

Symposium Papers

Volume:

215

Abstract:

Aspects of the design and installation of a novel carbon fibre reinforced polymer (CFRP) prestressed high strength concrete lighting column (Carbolith®) are presented. The tapered cylindrical columns have a nominal height of 8 m and contain an opening above the foundation to allow for the insertion of the lamp fuse box. The bending/torsion behaviour of a total of five full-scale prototype columns was tested in accordance with the relevant European standards (EN). In the experimental programme, the location of the fuse box opening relative to the loading direction was varied. All five poles fulfilled the EN serviceability and ultimate limit state requirements for lighting columns in pedestrian and/or low speed lightly trafficked areas. This successful outcome has lead to the first field application of the CFRP prestressed concrete lighting columns.

DOI:

10.14359/12858


Document: 

SP215-22

Date: 

August 1, 2003

Author(s):

A. Abdelrahman, M. Mohamadien, S. Rizkalla, and G. Tadros

Publication:

Symposium Papers

Volume:

215

Abstract:

Use of ACM in the form of FRP laminates in rehabilitation of concrete structures is the prime application of ACM in Egypt. FRP laminates are applied for strengthening reinforced concrete slabs or beams in flexure and shear as well as for confinement of reinforced concrete columns. This paper briefly introduces selected projects to demonstrate the current practice of FRP in Egypt. In the first application, carbon FRP (CFRP) laminates in the form of strips and sheets were applied to strengthen a public building suffering from differential settlement of the foundation. In a different application, CFRP laminates were used to upgrade a residential building to be used for commercial purpose. The paper summarizes the design aspects, construction details and recommendations for future application of ACM.

DOI:

10.14359/12877


Document: 

SP215-06

Date: 

August 1, 2003

Author(s):

R. Gastmeyer and R. C. Donahey

Publication:

Symposium Papers

Volume:

215

Abstract:

A new connector system and a new method for the construction of partially precast concrete sandwich panels are described. The new connectors are constructed using glass fiber reinforced polymer and are used to tie two precast concrete layers together through a layer of rigid extruded polystyrene insulation. In contrast to existing connector systems that incorporate steel lattice girders, the new system effectively eliminates thermal bridges and undesirable forced compatibility strains in the concrete layers. In addition to providing energy savings for the building owner, the new system and method can provide cost savings for the wall fabricator.

DOI:

10.14359/12861


Document: 

SP215-20

Date: 

August 1, 2003

Author(s):

I. N. Robertson, A. A. Agapay, and L. M. Nakashima

Publication:

Symposium Papers

Volume:

215

Abstract:

In 1997, a precast, prestressed T-beam in the Ala Moana Shopping Center parking garage, in Honolulu, Hawaii, was strengthened in flexure using carbon fiber reinforced polymer (CFRP) strips epoxy bonded to the soffit of the beam. When the parking garage was demolished in June 2000, this beam and two control beams were salvaged and brought to the University of Hawaii for testing. This paper presents the retrofit procedures used during field application of the CFRP strips. It also describes the beam recovery and preparation for laboratory testing. The test program and results of the flexural testing of both unstrengthened and strengthened beams under four-point loading are presented in detail. The CFRP retrofit significantly increased the flexural capacity of the beam while also increasing its flexural ductility. The failure moment was well in excess of the nominal moment capacity predicted using the strain-compatibility procedure described in the ACI 440R-02 report.

DOI:

10.14359/12875


Document: 

SP215-19

Date: 

August 1, 2003

Author(s):

S. Matthys, L. Taerwe, J. Janssens, and D. De Neef

Publication:

Symposium Papers

Volume:

215

Abstract:

The use of externally bonded FRP (Fibre Reinforced Polymers) reinforcement for strengthening or rehabilitation purposes is becoming a well documented and often applied technique world-wide. A particular application of this technique in Belgium, is a rehabilitation project at the Antwerp Zoo, where an innovative strengthening system based on multidirectional carbon fibre reinforced polymer (CFRP) composites was applied. This system, offering new possibilities for strengthening of structures, consists of PC CarboComp Plus laminates and sandwich prefab composite beams. A two-way slab and supporting beams were successfully repaired and strengthened in only 38 days, with a minimum of disruption (animals were not relocated and the building remained open for public) and respecting the restraints typical for a protected historical building. In a second phase of the project, masonry columns at the basement level were wrapped with aramid FRP (AFRP) and the supported beams were strengthened with CFRP sandwich prefab elements. In order to achieve sufficient efficiency of the wrapping, transverse links were provided through the rectangular columns. Related to the first part of this project, experimental verification of the system was performed.

DOI:

10.14359/12874


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