Bridge Management, Inspection and Sustainability
Full Session with Abstracts
335554-5 - Extending the life-cycle of reinforced concrete columns by FRP strengthening
Saturday, April 21
8:00 AM - 9:30 AM
There is an increasing importance of the topic of the extension of life-cycle of existing structures and infrastructures. This fact is corroborated by different reports, e.g. the ASCE (2013) Report Card for America’s Infrastructure which points out that one in nine of the US bridges are rated as structurally deficient, while the average age of the 607,380 bridges is approaching 50 years.
As such, three important elements are required in the extension of the life-cycle of structures and infrastructures: (i) the availability of repair/strengthening techniques for the specific problem under consideration; (ii) assessment of the effectiveness of the strengthening method; and (iii) implementation of strengthening techniques in design standards following semi-probabilistic formats.
Concrete is the most used construction material in the world; as a result, among those structural elements in need of repair/strengthening are reinforced concrete (RC) columns. For such elements, the use of FRP jackets in the confinement of RC columns has received large attention from both the academia and practitioners. It has been reported in a number of studies that FRP confinement of a RC column significantly increases its strength and ductility, without changing column weight and cross-sectional dimensions.
In this talk we will discuss a number of the issues related to this technique in the light of the three above mentioned requirements. Special attention will be given to the topics: existing versus new structures assessments; FRP-RC confined columns versus FRP-confined concrete; circular versus square (or rectangular) cross-sections; short versus slender FRP-RC confined columns; CFRP versus GFRP composites; monotonic versus cyclic loading; and deterministic versus probabilistic modeling.