Axial load transfer in non-slender ultra-high-strength concrete columns through normal-strength concrete floor slabs

2017 ◽  
Vol 136 ◽  
pp. 466-480 ◽  
Author(s):  
Hyun-Oh Shin ◽  
Young-Soo Yoon ◽  
Denis Mitchell
Keyword(s):  
High Strength Concrete ◽  
Axial Load ◽  
Load Transfer ◽  
High Strength ◽  
Concrete Columns ◽  
Normal Strength Concrete ◽  
Strength Concrete ◽  
Floor Slabs ◽  
Normal Strength ◽  
High Strength Concrete Columns

Is it reasonable to use high-strength concrete columns under fire conditions?

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Oliver Bahr
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Concrete Columns ◽  
Fire Performance ◽  
Normal Strength Concrete ◽  
Cross Sectional ◽  
Content Type ◽  
Strength Concrete ◽  
Normal Strength ◽  
High Strength Concrete Columns

PurposeThis paper aims to answer two questions. First, are there any differences in the fire performance of columns made of normal and of high-strength concrete? Second, under which circumstances does the fire design govern the cross-sectional dimensions of concrete columns? Is it feasible to replace columns out of normal strength concrete by more slender high-strength concrete columns?Design/methodology/approachThe author conducted numerical studies using the finite element code “Infocad” of the German company “Infograph”. The studies included the effect of different parameters on the fire performance of columns out of normal and high-strength concrete, i.e. the load ratio and eccentricity, boundary conditions and times of fire exposure.FindingsResults from the numerical investigations showed that high-strength concrete columns suffer much more from heating than normal strength concrete columns. This is the outcome of the unfavourable mechanical properties of high-strength concrete at elevated temperatures. Although the relative fire performance of columns out of high-strength concrete is worse than that of columns out of normal strength concrete, initial load reserves are beneficial to achieve even high fire ratings.Originality/valueMany researchers addressed in experimental and numerical studies the fire performance of columns out of normal and high-strength concrete. A special emphasis was often laid on the spalling of fire-exposed high-strength concrete. However, there are no systematic investigations when the fire design governs the cross-sectional dimensions of high-strength concrete columns. Based on a previous comparison of the relative fire performance of columns out of normal and high-strength concrete, this paper, hence, addresses the question whether there is a reasonable lower limit for the use of these columns. This is an important aspect for designers since there is a tendency to replace columns out of normal strength concrete by columns out of high-strength concrete. Higher concrete strengths allow for smaller cross sections of the columns, and designers may, hence, increase the usable space of buildings.

Study on the Factors Affecting the Anti-Seismic Performance of Steel Reinforced High-Strengh Concrete Columns

2012 ◽  
Vol 535-537 ◽  
pp. 1842-1846
Author(s):  
Bao Sheng Yang ◽  
Shi Hua Song
Keyword(s):  
Seismic Performance ◽  
High Strength Concrete ◽  
Axial Load ◽  
Seismic Behavior ◽  
Influencing Factor ◽  
High Strength ◽  
Concrete Columns ◽  
Factors Affecting ◽  
Strength Concrete ◽  
High Strength Concrete Columns

Through experimental study of six steel reinforced high strength concrete columns under low cyclic horizontal loads, the influence on anti-seismic behavior of the columns under different axial load coefficient, stirrup ratio and steel reinforced form is analyzed.The study found in addition to the fact that the anti-seismic performance of high strength concrete columns is sensitive to axial load coefficient, steel reinforced form is also an important influencing factor. For high strength concrete columns with different steel reinforced forms, appropriate adjustment of its axial load coefficient may be carried out, however the influence of stirrup ratio is very little on anti-seismic performance of columns.

Flexural-Shear Behavior of High-Strength Concrete Short Columns

2001 ◽  
Vol 17 (4) ◽  
pp. 679-695 ◽  
Author(s):  
Armen Martirossyan ◽  
Yan Xiao
Keyword(s):  
High Strength Concrete ◽  
Axial Load ◽  
High Strength ◽  
Concrete Columns ◽  
Experimental Program ◽  
Stress Strain ◽  
Strength Concrete ◽  
Short Columns ◽  
Strain Relationship ◽  
High Strength Concrete Columns

This paper discusses the seismic performance of high-strength concrete columns. The research is a part of an ongoing comprehensive experimental program to investigate seismic design methods of high-strength concrete structures. The first stage of the program involved testing of fifteen high-strength concrete stub columns under concentric axial compression. The concrete compressive strength was about 69 MPa (10,000 psi). In addition, a large database including eighty-six similar tests conducted by other researchers was constructed, and stress-strain behavior of high-strength concrete was investigated. Based on the analysis, a stress-strain relationship for high-strength concrete columns was proposed. Secondly, six 1/3-1/2 scale high-strength concrete short columns were tested under combined axial load and cyclic shear, with double curvature condition. The primary experimental parameters included axial load ratio, longitudinal reinforcement ratio, and volumetric ratio of transverse reinforcement. The proposed stress-strain relationship was used in the analysis of the lateral force–displacement relationship for high-strength concrete columns. Moment-curvature analysis, based on proposed equivalent stress block approach, as well as plastic hinge mechanism, has been incorporated in this analytical tool. The analytical results agreed well with the primary load-deflection envelopes obtained from the tests.

Ductility and stiffness of slender confined reinforced high-strength concrete columns under monotonic axial load

Measurement ◽  
2019 ◽  
Vol 146 ◽  
pp. 838-845
Author(s):  
Chau-Khun Ma ◽  
Muhd Fauzy Sulaiman ◽  
Nazirah Apandi ◽  
Abdullah Zawawi Awang ◽  
Wahid Omar ◽  
...  
Keyword(s):  
High Strength Concrete ◽  
Axial Load ◽  
High Strength ◽  
Concrete Columns ◽  
Strength Concrete ◽  
High Strength Concrete Columns
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