Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Durability of FRP used for external strengthening of structural elements
The use of externally applied fiber reinforced polymers (FRP) to strengthen and rehabilitate structural elements has become widespread over the past decade. One of the early uses was on bridge columns in an effort to increase the confinement of the vertical reinforcement steel and prevent significant damage to these structures during strong ground motions typically caused by earthquakes. Research conducted at the University of California at San Diego concluded that the use of FRP inhibits lap splice failure, enhances the ductility and increases the shear strength of bridge columns. In addition to extensive laboratory testing, columns retrofitted with FRP in the field were undamaged by the Northridge earthquake back in 1994. The big questions that remains for FRP is one of durability. Will these materials be able to with stand the effects of sunlight, alkali, chlorides, industrial pollutants, chemical attack and any other imaginable deleterious compounds that may come in contact with the FRP?. In an effort to answer this question, two recent durability studies have been conducted at research facilities in North America. In both cases the conclusions clearly indicate that FRP strengthening of existing structural members is a viable solution that will offer a long-term retrofit for owners of all types of structures. These studies couples with field applications now approaching a decade of service give a clear indication of FRP durability.
Durability of FRP used for external strengthening of structural elements
The use of externally applied fiber reinforced polymers (FRP) to strengthen and rehabilitate structural elements has become widespread over the past decade. One of the early uses was on bridge columns in an effort to increase the confinement of the vertical reinforcement steel and prevent significant damage to these structures during strong ground motions typically caused by earthquakes. Research conducted at the University of California at San Diego concluded that the use of FRP inhibits lap splice failure, enhances the ductility and increases the shear strength of bridge columns. In addition to extensive laboratory testing, columns retrofitted with FRP in the field were undamaged by the Northridge earthquake back in 1994. The big questions that remains for FRP is one of durability. Will these materials be able to with stand the effects of sunlight, alkali, chlorides, industrial pollutants, chemical attack and any other imaginable deleterious compounds that may come in contact with the FRP?. In an effort to answer this question, two recent durability studies have been conducted at research facilities in North America. In both cases the conclusions clearly indicate that FRP strengthening of existing structural members is a viable solution that will offer a long-term retrofit for owners of all types of structures. These studies couples with field applications now approaching a decade of service give a clear indication of FRP durability.
Durability of FRP used for external strengthening of structural elements
Watson, R.J. (Autor:in)
2000
9 Seiten, 10 Quellen
Aufsatz (Konferenz)
Englisch
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