scholarly journals Behaviour of ductile hollow reinforced concrete columns

1983 ◽  
Vol 16 (4) ◽  
pp. 273-290 ◽  
Author(s):  
J. B. Mander ◽  
M. J. N. Priestley ◽  
R. Park
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Plastic Hinge ◽  
Concrete Columns ◽  
Bridge Piers ◽  
Reinforced Concrete Bridge ◽  
Hinge Zone ◽  
Lateral Displacements ◽  
Transverse Steel ◽  
Constant Axial Load

An experimental investigation into the seismic performance of ductile hollow reinforced concrete bridge piers is described. Four 3.2 m high specimens, 750 mm square with 120 mm thick walls containing 60 longitudinal steel bars and different arrangements of confining steel in the plastic hinge zone were subjected to a constant axial load and cyclic lateral displacements. An assessment of the effect of axial load and the amount of transverse steel on the rotational capacity of the plastic hinge is made. The specimens performed satisfactorily at member ductilities between 6 and 8 without 
any significant degradation of strength under cyclic loading.

Seismic Evaluation of Existing Reinforced Concrete Building Columns

1996 ◽  
Vol 12 (4) ◽  
pp. 715-739 ◽  
Author(s):  
Abraham C. Lynn ◽  
Jack P. Moehle ◽  
Stephen A. Mahin ◽  
William T. Holmes
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Lateral Displacement ◽  
Concrete Columns ◽  
Vertical Load ◽  
Seismic Evaluation ◽  
Severe Damage ◽  
Reinforced Concrete Columns ◽  
Concrete Building ◽  
Constant Axial Load

Past earthquakes have emphasized the vulnerability of reinforced concrete columns having details typical of those built before the mid-1970's. These columns are susceptible to axial-flexural, shear, and bond failures, which subsequently may lead to severe damage or collapse of the building. Research was undertaken to investigate the lateral and vertical load-resisting behavior of reinforced concrete columns typical of pre-1970's construction. Eight full-scale specimens were constructed and were loaded with constant axial load and increasing cyclic lateral displacement increments until failure. Test data are presented and compared with behavior estimated by using various evaluation methods.

scholarly journals Shear Strength Model for Reinforced Concrete Columns with Low Transverse Reinforcement Ratios

2014 ◽  
Vol 17 (10) ◽  
pp. 1373-1385 ◽  
Author(s):  
Cao Thanh Ngoc Tran ◽  
Bing Li
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Axial Load ◽  
Concrete Columns ◽  
Transverse Reinforcement ◽  
Reinforced Concrete Column ◽  
Reinforced Concrete Columns ◽  
Existing Structures ◽  
Reversed Cyclic ◽  
Constant Axial Load

This paper introduces an equation developed based on the strut-and-tie analogy to predict the shear strength of reinforced concrete columns with low transverse reinforcement ratios. The validity and applicability of the proposed equation are evaluated by comparison with available experimental data. The proposed equation includes the contributions from concrete and transverse reinforcement through the truss action, and axial load through the strut action. A reinforced concrete column with a low transverse reinforcement ratio, commonly found in existing structures in Singapore and other parts of the world was tested to validate the assumptions made during the development of the proposed equation. The column specimen was tested to failure under the combination of a constant axial load of 0.30 f' c A g and quasi-static cyclic loadings to simulate earthquake actions. The analytical results revealed that the proposed equation is capable of predicting the shear strength of reinforced concrete columns with low transverse reinforcement ratios subjected to reversed cyclic loadings to a satisfactory level of accuracy

Seismic Behavior of Concrete Columns Confined by CFRP and GFRP Jackets

2013 ◽  
Vol 405-408 ◽  
pp. 657-663
Author(s):  
Yu Mei Teng ◽  
Ye Tian ◽  
James Liu
Keyword(s):  
Tensile Strength ◽  
Seismic Performance ◽  
Axial Load ◽  
Seismic Behavior ◽  
Large Scale ◽  
Concrete Columns ◽  
Cyclic Displacement ◽  
Transverse Steel ◽  
The Moment ◽  
Constant Axial Load

This paper presents experimental results of a series of large-scale reinforced concrete circular and square columns tested under lateral cyclic displacement excursions while simultaneously subjected to constant axial load. All the specimens contained only minimal transverse steel and were then retrofitted with CFRP or GFRP jackets except control specimens. The measured hysteretic loops of the moment vs. curvature and shear vs. deflection relationships are reported for each specimen. It was observed that both CFRP and GFRP wrapping could provide effective confinement and significantly improve the seismic performance of columns. The effectiveness of FRP in enhancing column ductility relates more closely to its tensile strength than stiffness, thus the application of GFRP confinement to concrete columns is promoted due to obtainability and economical concern.

Seismic evaluation and retrofit with steel jackets of reinforced concrete bridge piers detailed with lap-splices

2000 ◽  
Vol 27 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Xavier Daudey ◽  
André Filiatrault
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Plastic Hinge ◽  
Bridge Piers ◽  
Concrete Bridge ◽  
Eastern Canada ◽  
Bond Slip ◽  
Lap Splices ◽  
Reinforced Concrete Bridge ◽  
Recent Earthquakes

Recent earthquakes around the world have confirmed the poor seismic behavior of reinforced concrete bridge piers incorporating typical pre-1971 reinforcement details. Since the 1971 San Fernando earthquake in California, procedures to evaluate accurately the flexural and shear behavior of reinforced concrete bridge piers, as well as retrofit techniques to address economically the most common deficiencies, have been elaborated. In eastern Canada, the majority of reinforced concrete bridge structures incorporate piers with similar reinforcement details as those that suffered severe damage, or collapse, during recent earthquakes in California and Japan. Very little research, however, has been conducted on the seismic behavior of these structures, which often exhibit complex cross-sectional geometries and lap-splices in the plastic hinge region. This paper presents a contribution towards a better understanding of the seismic behavior and retrofit of reinforced concrete bridge piers in eastern Canada through quasi-static tests performed on five 1/3.65-scale pier models of an existing bridge structure in the Montreal region. The first specimen was tested in its existing conditions, while the four others were retrofitted with steel jackets. The geometry of the jacket, the size of the gap at the base of the pier, and the properties of the fill material between the jacket and the original cross section were investigated in these last four tests. A numerical model, considering the bond-slip between the concrete and the longitudinal reinforcement, is proposed to simulate the experimental results. Key words: bond-slip, bridge piers, ductility, hysteresis loops, lap-splices, seismic retrofit, steel jackets.

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