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Home > Publications > International Concrete Abstracts Portal
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.
Showing 1-5 of 27 Abstracts search results
Document:
SP215-25
Date:
August 1, 2003
Author(s):
J. G. Tumialan, D. Torrealva, E. Pasquel, and A. Nanni
Publication:
Symposium Papers
Volume:
215
Abstract:
The earthquake of June 23, 2001, that affected most of the southern part of Peru, put in evidence the seismic vulnerability of icons of the cultural heritage of the country. The historical downtown of the city of Arequipa (located at 1000 km to the South of Lima) was heavily affected by the earthquake, with forty percent of its representative buildings suffering damage ranging from moderate to severe with partial collapse. The towers of the cathedral of Arequipa, built integrally with a volcanic stone called sillar, suffered extensive damage. As a consequence, the left tower partially collapsed, whereas, the right tower remained standing but in an unstable condition. This paper describes the reinforcing strategy of the right tower with Carbon Fiber Reinforced Polymer (CFRP) laminates, which were used to provide tensile strength and confinement to the central stone core of the tower. After completing the CFRP installation, carved stones were placed on top of the laminates to keep the original appearance.
DOI:
10.14359/12880
SP215-20
I. N. Robertson, A. A. Agapay, and L. M. Nakashima
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.
10.14359/12875
SP215-08
J.-H. Choi and H.-L. Chen
Substitution of conventional steel reinforcing rebars with Glass Fiber Reinforced Polymer (GFRP) rebars in Continuously Reinforced Concrete Pavement (CRCP) gives solutions to the problems caused by corrosion of reinforcement. Concrete volume change, due to shrinkage and temperature variations is known to cause crack development in CRCP. In this study, the stress levels in concrete and GFRP rebars and the crack widths at various crack spacings are predicted using numerical methods. The results reveal that using GFRP rebars as reinforcement in CRCP reduces the tensile stress in concrete. The bond-slip between concrete and reinforcement and the friction from the pavement's subbase have important effects on the development of the reinforcement's stresses and the crack widths. The design of a GFRP-reinforced CRCP to be constructed during this year is proposed. The behavior of the CRCP due to concrete shrinkage and temperature variation is predicted. The stress levels in the GFRP reinforcement, the crack width and the crack spacing of the proposed pavement are shown to be within the design requirements.
10.14359/12863
SP215-06
R. Gastmeyer and R. C. Donahey
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.
10.14359/12861
SP215-26
J. G. Tumialan, N. Galati, A. Nanni, and D. Tyler
Fiber reinforced polymer (FRP) composites in the form of laminates or bars have been proven to be effective for the strengthening of unreinforced masonry (URM) walls subjected to overstresses. Two installation techniques have been proposed: externally-bonded FRP laminates (i.e. manual lay-up or adhesion of pre-cured laminates) and near surface mounted (NSM) FRP bars. The latter technique consists of placing a bar in a groove cut into the surface of the member being strengthened. This paper presents a field application on flexural strengthening with NSM FRP bars of two cracked URM walls in an educational facility. Design considerations and the results of an experimental program conducted to validate the strengthening are described.
10.14359/12881
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