Experimental tests of slender reinforced concrete columns under combined axial load and lateral force

Abstract The use of high strength concrete (HSC) in columns has become more frequent since a substantial reduction of the cross-section is obtained, meaning that slenderness increases for the same axial load and length, producing higher second order effects. However, the experimental tests in the literature of reinforced concrete columns subjected to axial load and lateral force focus on shear span ratios, according to Eurocode 2 (2004), clause 5.6.3., ( M / ( V ⋅ h ) ) lower than 6.5. This gap in the literature limits technological development for the construction of these structural elements. This paper presents 44 experimental tests on reinforced concrete columns subjected to constant axial load and monotonic lateral force. The aim of this is to gain greater knowledge of the types of elements which will also be of use in calibrating the numerical models and validating the simplified methods. The test parameters are strength of concrete (normal- and high-strength concrete), shear span ratio, axial load level and longitudinal and transversal reinforcement ratios. The strength and deformation of the columns were studied, and an analysis of the simplified methods from Eurocode 2 (2004) and ACI-318 (2008) concluded that both are very conservative.

[1]  Oguzhan Bayrak,et al.  High-strength concrete columns under simulated earthquake loading , 1997 .

[2]  T. Paulay,et al.  Seismic Design of Reinforced Concrete and Masonry Buildings , 1992 .

[3]  J. G. Macgregor,et al.  Structural Design Considerations for High-Strength Concrete , 1993 .

[4]  Oguzhan Bayrak,et al.  Plastic Hinge Length of Reinforced Concrete Columns , 2008 .

[5]  Shamim A. Sheikh,et al.  CONFINED CONCRETE COLUMNS WITH STUBS , 1993 .

[6]  P. Paultre,et al.  Behavior of High-Strength Concrete Columns under Cyclic Flexure and Constant Axial Load , 2000 .

[7]  Hyun-Do Yun,et al.  Effects of transverse reinforcement on flexural behaviour of high-strength concrete columns , 2004 .

[8]  Frederic Legeron,et al.  INFLUENCE OF CONCRETE STRENGTH AND TRANSVERSE REINFORCEMENT YIELD STRENGTH ON BEHAVIOR OF HIGH-STRENGTH CONCRETE COLUMNS , 2001 .

[9]  塩原 等,et al.  Performance-based engineering for earthquake resistant reinforced concrete structures : a volume honoring Shunsuke Otani , 2003 .

[10]  Mjn Priestley,et al.  STRENGTH AND DUCTILITY OF CONCRETE BRIDGE COLUMNS UNDER SEISMIC LOADING , 1987 .

[11]  B. Ang.  Ductility of reinforced concrete bridge piers under seismic loading. , 1981 .

[12]  Jcm Ho,et al.  Length of critical region for confinement steel in limited ductility high-strength reinforced concrete columns , 2009 .

[13]  M. Fardis,et al.  Deformations of Reinforced Concrete Members at Yielding and Ultimate , 2001 .

[14]  Michael N. Fardis,et al.  fib Bulletin 24. Seismic assessment and retrofit of reinforced concrete buildings , 2003 .

[15]  Khalid M. Mosalam,et al.  PACIFIC EARTHQUAKE ENGINEERING RESEARCH CENTER , 2009 .

[16]  Jcm Ho,et al.  Inelastic design of low-axially loaded high-strength reinforced concrete columns , 2003 .

[17]  Stephen J. Foster,et al.  Experimental tests on eccentrically loaded high-strength concrete columns , 1997 .

[18]  P. Mendis,et al.  Plastic Hinge Lengths of Normal and High-Strength Concrete in Flexure , 2002 .

[19]  Andrea Vignoli,et al.  Strength and Ductility of HSC and SCC Slender Columns Subjected to Short-Term Eccentric Load , 2008 .

[20]  Gerardo M. Verderame,et al.  Seismic response of r.c. columns with smooth reinforcement. Part I: Monotonic tests , 2008 .