FraMCoS 5 2004 Vail, Colorado, USA

Size Effect in Structural High Strength Concrete

Determination of true size effect in high strength concrete (HSC) is very important. Moreover, a comprehensive study of the same is also of utmost important when wide variables such as geometry and other influencing factors are included. This paper, therefore,…

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Year 2004
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Abstract

Determination of true size effect in high strength concrete (HSC) is very important. Moreover, a comprehensive study of the same is also of utmost important when wide variables such as geometry and other influencing factors are included. This paper, therefore, enumerates some experimental and analytical studies to understand the type of size effect in high strength concrete structures. Different geometries are adopted to distinguish the nature of size effect law. Experimental observations shows that a complex size effect on strength of HSC exists in direct tension using double edge notch compact tension specimens (DENCTS), while strong size effect has been observed in HSC using eccentric compact compression specimens (ECCS) and three-point bend beam (TPB) specimens. Relatively large size specimens are needed to achieve general size effect in direct tension. A characteristic size of 210 mm seems to be the smallest size to observe size effect in direct tension. The size of fracture process zone (FPZ) in HSC has been analyzed. The effect of geometry on size effect has been analyzed using the extent of FPZ in the crack tip regions.