Strengthening of RC walls using externally bonding of steel strips

Abstract The purpose of this experimental study is to investigate the hysteretic behavior of shear deficient reinforced concrete (RC) shear walls that are strengthened by bonding of steel strips. Four, 1/2 scale shear wall test specimens were constructed and tested under cyclic lateral loading. The slenderness ratio of the wall (h/l, where h = wall height, l = wall length) was 1.5. For this experimental research three wall specimens were strengthened with different steel strips configurations. The different configurations of steel strips were considered the diagonal strip, lateral strip and the combination of both lateral and vertical strips. All steel strip configurations are arranged on both sides of the shear wall symmetrically. The research focused on the effect of using bonding steel strips enhanching strength and increasing ductility of the non-seismic detailed shear walls. Test results showed that all the steel strip configurations improved the lateral strength, energy dissipation capacity and deformation capacity of the shear deficient RC wall significantly. Strengthened specimens developed the nominal flexural strength, and hence, the observed maximum base shear was controlled by flexure. Steel strips limited the opening of shear cracks and improved the lateral displacement capacity.

[1]  Hiroshi Mutsuyoshi,et al.  Shear strengthening of reinforced concrete beams using steel plates bonded on beam web: experiments and analysis , 2000 .

[2]  R. Barnes,et al.  Strengthening of reinforced concrete beams in shear by the use of externally bonded steel plates: Part 2 – Design guidelines , 2006 .

[3]  A. V. Pinto,et al.  Cyclic tests on large‐scale models of existing bridge piers with rectangular hollow cross‐section , 2003 .

[4]  E. Bentz.  Sectional analysis of reinforced concrete members , 2000 .

[5]  M. A. Erki,et al.  STRENGTHENING OF REINFORCED CONCRETE FLEXURAL MEMBERS USING EXTERNALLY APPLIED STEEL PLATES AND FIBRE COMPOSITE SHEETS - A SURVEY , 1994 .

[6]  R N Swamy,et al.  PLATE SEPARATION AND ANCHORAGE OF REINFORCED CONCRETE BEAMS STRENGTHENED BY EPOXY-BONDED STEEL PLATES , 1988 .

[7]  Ö. Anıl,et al.  Improving shear capacity of existing RC beams using external bonding of steel plates , 2005 .

[8]  Björn Täljsten,et al.  Defining anchor lengths of steel and CFRP plates bonded to concrete , 1997 .

[9]  N. K. Subedi,et al.  External Plate Reinforcement for Concrete Beams , 1998 .

[10]  Andreas J. Kappos,et al.  Cyclic Load Behavior of Low-Slenderness Reinforced Concrete Walls: Design Basis and Test Results , 1999 .

[11]  Richard Andrew Barnes,et al.  The transfer of stress through a steel to concrete adhesive bond , 2001 .

[12]  A. Kappos,et al.  Tests on Seismically Damaged Reinforced Concrete Walls Repaired and Strengthened Using Fiber-Reinforced Polymers , 2005 .

[13]  R. L'Hermite.  Use of bonding techniques for reinforcing concrete and masonry structures , 1977 .

[14]  Anne Marsden,et al.  International Organization for Standardization , 2014 .

[15]  A. Kappos,et al.  Evaluation of hysteretic response and strength of repaired R/C walls strengthened with FRPs , 2007 .

[16]  Mohammed H. Baluch,et al.  PEELING AND DIAGONAL TENSION FAILURES IN STEEL PLATED R/C BEAMS , 1999 .

[17]  Alessandra Marini,et al.  Retrofitting of R/C shear walls by means of high performance jackets , 2009 .

[18]  Ezio Giuriani,et al.  Cyclic behaviour of a full scale RC structural wall , 2003 .

[19]  A. Kappos,et al.  Cyclic Load Behavior of Low-Slenderness Reinforced Concrete Walls: Failure Modes, Strength and Deformation Analysis, and Design Implications , 2000 .

[20]  Ahmed Ghobarah,et al.  The August 17, 1999, Kocaeli (Turkey) earthquake - damage to structures , 2001 .

[21]  Cak Irwin,et al.  THE STRENGTHENING OF CONCRETE BEAMS BY BONDED STEEL PLATES , 1975 .

[22]  Michel Bruneau,et al.  Seismic Retrofitting of Low-Rise Masonry and Concrete Walls Using Steel Strips , 2000 .

[23]  Kent A. Harries,et al.  Seismic Retrofit of Reinforced Concrete Coupling Beams Using Steel Plates , 1996 .