Plastic Hinge Relocation Methods for Emulative PC Beam-Column Connections

AbstractVarious plastic hinge relocation methods were studied to improve the earthquake resistance of emulative precast concrete (PC) beam-column connections using PC U-shell beams. The present study used two strengthening methods (hooked bars and headed bars) and a weakening method (reduced beam bar section), to relocate the plastic hinge zone of beams away from the weak beam-column joint. Five full-scale test specimens including a conventional reinforced concrete (RC) specimen were tested to evaluate the earthquake resistance. The test results showed that the used relocation methods significantly decreased that bond-slip of beam flexural bars and joint shear cracking. As a result, the energy dissipation capacity significantly increased, compared to those of the conventional RC specimens and PC specimens without relocation methods. On the basis of the test results, design recommendations are suggested for plastic hinge relocation design of emulative PC beam-column connections.

[1]  James K. Wight,et al.  Study of Moving Beam Plastic Hinging Zones for Earthquake-Resistant Design of Reinforced Concrete Buildings , 1987 .

[2]  Stefano Pampanin,et al.  Development and validation of a metallic haunch seismic retrofit solution for existing under‐designed RC frame buildings , 2006 .

[3]  Arthur H. Nilson,et al.  Design of concrete structures , 1972 .

[4]  Hamid R. Ronagh,et al.  Plastic hinge relocation in RC joints as an alternative method of retrofitting using FRP , 2012 .

[5]  Hikaru Nakamura,et al.  Fatigue Failure Criterion for Deformed Bars Subjected to Large Deformation Reversals , 2006 .

[6]  D. Bolognini,et al.  Performance-Based Seismic Retrofit Strategy for Existing Reinforced Concrete Frame Systems Using Fiber-Reinforced Polymer Composites , 2007 .

[7]  Sung-Gul Hong,et al.  Deformation-Based Strut-and-Tie Model for Interior Joints of Frames Subject to Load Reversal , 2011 .

[8]  Robert Park,et al.  Seismic Resistance of Frames Incorporating Precast Prestressed Concrete Beam Shells , 1986 .

[9]  Bertero,et al.  AN APPROACH FOR IMPROVING SEISMIC BEHAVIOR OF REINFORCED CONCRETE INTERIOR JOINTS , 1977 .

[10]  Hong-Gun Park,et al.  Cyclic Loading Test for Reinforced-Concrete-Emulated Beam-Column Connection of Precast Concrete Moment Frame , 2013 .

[11]  Riyad S Aboutaha,et al.  Cyclic Response of Exterior Reinforced Concrete Beam-Column Joints Reinforced with Headed Bars-Experimental Investigation , 2003 .

[12]  Alireza Maheri,et al.  Seismic performance of ordinary RC frames retrofitted at joints by FRP sheets , 2010 .

[13]  Ahmed Ghobarah,et al.  Shear Strengthening of Beam-Column Joints , 2002 .

[14]  Li Bing,et al.  Application of the New Zealand Concrete Design Code NZS 3101 to High Strength Concrete , 1990 .

[15]  R. Fenwick.  Comparison of recent New Zealand and United States seismic design provisions for reinforced concrete beam-column joints and test results for four units designed according to the New Zealand Code , 1984 .

[16]  Jack P. Moehle,et al.  "BUILDING CODE REQUIREMENTS FOR STRUCTURAL CONCRETE (ACI 318-11) AND COMMENTARY" , 2011 .

[17]  Amorn Pimanmas,et al.  Shear strength of beam–column joint with enlarged joint area , 2010 .