Confined High Strength Concrete Columns: An Experimental Study

Saravanan, V.

doi:10.3844/ajeassp.2010.133.137

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…Many experimental research results were reported in the area of compressive and tensile strength of concrete at different strain rates (Abu-Lebdeh et al, 2010;Ravichandran et al, 2009;Kotsovos, 1983). A selection of the commonly published results is also reported by Saravanan et al, 2010;Bischoff and Perry, 1991;and Malvar and Crawford (1998) as presented in Fig. 1 and and Fig.…”

Section: Introductionmentioning

confidence: 84%

“…The DIF of concrete can be as high as 4 in compression and up to 6 in tension for strain rates in the range of 102-103 sec −1 (Sezen and Moehle, 2006). Based on experimental and analytical data reported by different researchers (Bischoff and Perry, 1991;CEB-FIP, 1993;Ngo et al, 2007;Saravanan et al, 2010;Abu-Lebdeh et al, 2010) the proposed strength increase factor (k d or DIF) can be presented as indicated in Eq. 1 and 2 and shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

Abu-Lebdeh¹

2011

American Journal of Engineering and Applied Sciences

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Problem statement:There is a need to better understand the rate dependence behavior of reinforced concrete structures in order to improve their response to impact and blast loads. Analysis and design of reinforced concrete structures subjected to seismic loadings has been recommended in many FEMA guidelines. However, reevaluation of design becomes extremely important in cases where large deformations are expected such as blast and impact resistant. Approach: This study presents a numerical model to evaluate reinforced concrete columns submitted to high strain rates expected for seismic, impact and blast loadings. The model utilizes dynamic stress-strain response and considers the effect of strain rate on concrete strength; strain at peak stress; yield and ultimate strength of steel; and slope of the softening portion of the stress-strain curve. Results: Results are presented in the form of interaction diagrams and compared with the available analytical and experimental results. Comparison with available data shows that the proposed model can give consistent prediction of the dynamic behavior of reinforced concrete columns. Conclusion/Recommendations: The established interaction diagrams may be used to design columns to withstand high velocity impact loads. Also, knowledge gained can be used to improve dynamic behavioral models and computer-aided analysis and design of reinforced concrete columns subjected to severe blast loadings.

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Section: Introductionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

Abu-Lebdeh¹

2011

American Journal of Engineering and Applied Sciences

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“…The unconfined compressive strength of VHSC can be five times the compressive strength of the conventional normal concrete and toughness of about eight times greater than that of conventional fiber reinforced concrete. These superior properties were achieved by considering several factors such as low flaws, particle packing, improved material homogeneity, low water cement ratio, mixing method and special curing treatment (Abu-Lebdeh et al, 2010a;2010b;O'Neil et al, 1999;Hamoush et al, 2010;Ravichandran et al, 2009;Saravanan et al, 2010). To date, researchers continue working on enhancing the properties of this new concrete.…”

Section: Introductionmentioning

confidence: 99%

Freezing and Thawing Durability of Very High Strength Concrete

Hamoush¹,

Picornell-Darder²,

Abu-Lebdeh³

et al. 2011

American Journal of Engineering and Applied Sciences

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Problem statement: The newly developed Very High Strength Concrete (VHSC), having compressive strengths of 29 ksi and flexural strengths of 6 ksi, represents a breakthrough in concrete technology. Study to further enhance the properties of this new concrete is continuing. Approach: The objective of this study is to investigate the effect of exposing Very High Strength Concrete (VHSC) specimens to rapid freeze/thaw cycles. Twenty one specimens were tested according to the Standards of the American Society for Testing and Materials ASTM C215, ASTM C666 and ASTM C78. Results: One hundred freeze/thaw cycles were performed on the VHSC specimens. Change in specimens dimensions and materials properties were recorded at zero, forty, seventy and one hundred cycles. Dimensions and properties considered were: dimension of cross section, length, weight, Dynamic Moduli, Poissons Ratio, durability factor and Modulus of Rupture. Conclusion/Recommendations: The test results indicated that VHSC is good freeze-thaw resistance (durability factor > 85%) and can avoid freeze/thaw damage. Freeze- thaw cycling did not significantly affect VHSC specimens cross sectional dimensions, length, or Poissons Ratio. However, there was a decrease in the specimens weight with the increase in number of freeze/thaw cycles, but the decrease was very slim indicating little or no deterioration has occur. Moreover, the fine voids exist in VHSC greatly lower the freezing point of any trapped water, making the material less susceptible to Freeze- Thaw damage

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“…Recently developed advanced cement-based materials like high strength concrete (HSC), ultra-high strength concrete (UHSC), or high performance (HPC) and ultrahigh performance (UHPC) concretes have shown drastic improvement in compressive strength, E-modulus, flexural strength as well as tensile strength (Richard 1994;Benjamin 2006;Saravanan 2010). However, one of the major disadvantages of these types of concretes is a low tensile strain capacity or ductility.…”

Section: Background and Strain Hardening Theory Of Shccmentioning

confidence: 99%

Mechanically Induced Cracking Behaviour in Fine and Coarse Sand Strain Hardening Cement Based Composites (SHCC) at Different Load Levels

Paul

Zijl

2013

ACT

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This research paper describes the development of strain hardening cement based composite (SHCC) with mostly local ingredients available in Stellenbosch, South Africa, and subsequent characterisation of crack distributions under various loading conditions. The mechanical induced cracking behaviour of SHCC containing local coarse sand (CS) (particle size up to 2.36 mm) is reported and compared with SHCC containing specially graded local fine sand (FS) (particle size up to 300 μm). Crack width distributions, obtained by digital image correlation, in direct tension at various average strain levels are presented for both FS and CS-SHCC dumbbell specimens. Both these SHCC types were also used to prepare beam specimens, both unreinforced and reinforced with steel bar at two reinforcement levels and with three cover depths. Both sand types could be used successfully for SHCC, achieving strain hardening and crack width and spacing control.

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Confined High Strength Concrete Columns: An Experimental Study

Cited by 10 publications

References 6 publications

High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

High Rate-Dependent Interaction Diagrams for Reinforced Concrete Columns

Freezing and Thawing Durability of Very High Strength Concrete

Mechanically Induced Cracking Behaviour in Fine and Coarse Sand Strain Hardening Cement Based Composites (SHCC) at Different Load Levels

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