Seismic Retrofitting of Reinforced Concrete Bridge Pier using Large Fracturing Strain Continuous Fiber Material

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ABSTRACT

In the year of 2003, some large earthquakes struck Japan including Hokkaido Island. These earthquakes caused some damages in many Japanese Railways (JR) bridge columns. Recently, there is an effort to retrofit these structures. The main issue is how to retrofit these structures economically in terms of cost savings and retain the mechanical performance of these structures according to Japanese Society of Civil Engineering (JSCE) Seismic Code. One of the solutions is to retrofit these structures by external wrapping using new type of continuous fiber materials. Therefore, investigation will be carried out by conducting experiments on Reinforced Concrete (RC) columns to find the optimum solution to retrofit the bridge columns. There are nine half model of RC column specimens, which will be retrofitted with various high fracturing strain fiber materials by external wrapping, will be tested under static axial (1MPa) and reversed horizontal load. The mechanical properties of these materials are low modulus of elasticity (E) and high fracturing strain at ultimate load. Some parameters that will be observed are the amount and arrangement of high fracturing fiber materials to get 10 d_y as ultimate deformation, type of failure mechanism, total crushing of RC column specimens at ultimate load, and to check whether there is any spalling of concrete cover, buckling of RC bar, or breakage of jacketing materials. The objective of the experiment is to investigate the shear strengthening and ductility enhancement effect with high fracturing strain continuous fiber materials (such as PEN and PET) and to clarify the possibility of using these materials as materials for seismic retrofit. Further prediction and modeling of shear strengthening and ultimate deformation of RC column retrofitted using these high fracturing fiber materials will be clarified.

KEYWORDS:      retrofit; mechanical performance; high fracturing strain continuous fiber; shear strengthening; ductility enhancement; ultimate deformation

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