Experimental Study of Seismic Behaviors of As-Built and Carbon Fiber Reinforced Plastics Repaired Reinforced Concrete Bridge Columns |
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Authors: | Shuenn-Yih Chang Yeou-Fong Li Chin-Hsiung Loh |
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Affiliation: | 1Assistant Professor, Dept. of Civil Engineering, National Taipei Univ. of Technology, No. 1, Section 3, Jungshiau East Rd., Daan Chiu, Taipei 106-08, Taiwan, Republic of China. 2Associate Professor, Dept. of Civil Engineering, National Taipei Univ. of Technology, Taipei 106, Taiwan, R.O.C. 3Professor, Dept. of Civil Engineering, National Taiwan Univ., Taipei 106, Taiwan, R.O.C.
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Abstract: | In order to reliably obtain seismic responses of as-built and repaired reinforced concrete bridge columns under near-fault ground motions, pseudodynamic testing of two bridge columns with a reduced scale of 2/5 was performed. Pseudodynamic test results reveal that a ductile member may have no chance to entirely develop its ductile behavior to dissipate seismic energy, because it may suddenly be destroyed by a significant pulse-like wave. The seismic performance of the two damaged bridge columns can be recovered after repair with carbon fiber reinforced plastics composite sheets. It is also experimentally confirmed that the flexural failure moment obtained from the pseudodynamic test is in good agreement with the plastic moment predicted by the ACI 318 code. As pseudodynamic test results are believed to be more accurate than numerical solutions, they can be considered as reference solutions in developing a finite-element model. An identical specimen was tested under cyclic loading to estimate basic properties of these columns, such as shear strength, flexural strength, and ductility, so that the seismic responses obtained from pseudodynamic tests can be thoroughly discussed. Furthermore, its hysteretic response may also be used to match a mathematical model to simulate the very complicated load-displacement relation for analysis. |
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Keywords: | Cyclic tests Pseudodynamic method Seismic response Rehabilitation Bridges, concrete Columns Ground motion |
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