Size effect of concrete members applied with flexural compressive stresses

In engineering materials, defects, such as cracks, may occur during production and/or due to various reasons. One of the aims of fracture mechanics is to determine the fracture toughness-based residual strength of structural members with cracks. A quasi-brittle material, such as concrete or rock, may include certain defects, such as voids and cracks, even before being exposed to loads. Experimental analyses on concrete members indicated that specimens’ nominal strength values were decreased as their sizes increased while specimen geometry is the same. In fracture mechanics, this condition was defined as the “size effect” in both concrete and reinforced concrete units. In the literature, numerous theoretical and experimental studies were conducted on beams while compact split-tension specimens, particularly notched ones are limited. In this study, six series of notched beams with three different sizes and notched square prismatic specimens with four different sizes were tested. According to the test results, the peak loads were analyzed by using the fundamental theorem of the modified size effect law. In conclusion, two formulae were proposed to predict the flexural strength and the splitting strength of quasi-brittle bodies with cracks.

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Design Approach for Flexural Strength of Reinforced Ultra-High-Performance Concrete Members Considering Size Effect

ACI Structural Journal ◽

10.14359/51734140 ◽

2022 ◽

Vol 119 (1) ◽

Author(s):

Fei Peng ◽

Weijian Yi ◽

Zhi Fang

Keyword(s):

Flexural Strength ◽

Size Effect ◽

High Performance ◽

High Performance Concrete ◽

Design Approach ◽

Ultra High Performance Concrete ◽

Concrete Members

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An Experimental Study on the Size Effect of Reinforced Concrete Members with Stirrups using Recycled Coarse Aggregates

Journal of Korea Society of Waste Management ◽

10.9786/kswm.2017.34.2.188 ◽

2017 ◽

Vol 34 (2) ◽

pp. 188-198

Author(s):

Ho-Kyung Lee ◽

Hyo-Myeong Gong ◽

Seung-Min Baek ◽

Woo-Suk Kim ◽

Yoon-Keun Kwak

Keyword(s):

Experimental Study ◽

Reinforced Concrete ◽

Size Effect ◽

Coarse Aggregates ◽

Concrete Members

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Application of size effect to compressive strength of concrete members

Sadhana ◽

10.1007/bf02706995 ◽

2002 ◽

Vol 27 (4) ◽

pp. 467-484 ◽

Cited By ~ 41

Author(s):

Jin-Keun Kim ◽

Seong-Tae Yi

Keyword(s):

Compressive Strength ◽

Size Effect ◽

Concrete Members ◽

Compressive Strength Of Concrete

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Research Progress in Size Effect of Reinforced Concrete Members and Comparative Analysis of Applications of Codes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.94-96.1357 ◽

2011 ◽

Vol 94-96 ◽

pp. 1357-1362

Author(s):

Er Wei Guo ◽

Zhen Bao Li ◽

Hong Yu Zhou ◽

Xiu Li Du

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Size Effect ◽

Basic Characteristic ◽

Research Progress ◽

Split Tensile Strength ◽

Concrete Material ◽

Rc Structures ◽

Concrete Members ◽

Properties Of Materials

Abstract. Size effect, referring to mechanical properties of materials change with the geometry changes, is the basic characteristic of brittle and quasi-brittle materials. Researches show that for the concrete material, compressive strength, split tensile strength and tensile strength decrease with the size of components increases, for RC structures, size effect also exists. The development and current situation in size effect are presented from three aspects, including concrete, RC members and the application of the code. And then, the developing trends of size effect of RC members are proposed.

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