Experimental Study of Seismic Behaviors of As-Built and Carbon Fiber Reinforced Plastics Repaired Reinforced Concrete Bridge Columns

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.

[1]  Shuenn-Yih Chang,et al.  Explicit Pseudodynamic Algorithm with Unconditional Stability , 2002 .

[2]  S. Y. Chang,et al.  Application of the momentum equations of motion to pseudo–dynamic testing , 2001, Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[3]  Keh-Chyuan Tsai,et al.  Improved time integration for pseudodynamic tests , 1998 .

[4]  Shuenn-Yih Chang.  An improved on-line dynamic testing method , 2002 .

[5]  Shuenn‐Yih Chang.  Nonlinear Error Propagation Analysis for Explicit Pseudodynamic Algorithm , 2003 .

[6]  Stephen A. Mahin,et al.  EXPERIMENTAL ERROR EFFECTS IN PSEUDODYNAMIC TESTING , 1990 .

[7]  E. Cowen,et al.  Turbulent Prandtl Number in Neutrally Buoyant Turbulent Round Jet , 2002 .

[8]  N. Huang,et al.  The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis , 1998, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[9]  Mjn Priestley,et al.  Seismic Design and Retrofit of Bridges , 1996 .

[10]  Chin-Hsiung Loh,et al.  Ground motion characteristics of the Chi‐Chi earthquake of 21 September 1999 , 2000 .

[11]  Nathan M. Newmark,et al.  A Method of Computation for Structural Dynamics , 1959 .

[12]  Stephen A. Mahin,et al.  Cumulative experimental errors in pseudodynamic tests , 1987 .

[13]  Shuenn-Yih Chang.  Improved numerical dissipation for explicit methods in pseudodynamic tests , 1997 .