Abstract
Concrete is the most widely used material for bridge structures in Lithuania. A case study performed by the authors revealed that application of fibres might improve serviceability of such structures. However, adequacy of prediction of the post-cracking behaviour of steel fibre reinforced concrete might be insufficient. The latter issue is closely related to the assessment of the residual strength of steel fibre reinforced concrete. The residual strength, in most cases, is considered as a material property of the cracked concrete. However, in the prediction of the structural behaviour of the concrete members with bar reinforcement, a straightforward application of the residual strength values assessed by using standard techniques might lead to incorrect results. The present study deals with the post-cracking behaviour of structural elements made of concrete with aggregates and fibres provided by Lithuanian companies. Test results of three full-scale and sixteen standard steel fibre reinforced concrete beams with two different content of fibres (23.6 kg/m3 and 47.1 kg/m3) are presented. The full-scale beams were reinforced with high-grade steel bars. Effectiveness of the application of the minimum content of the fibres in combination with bar reinforcement was revealed experimentally.
Highlights
Steel fibre reinforced concrete (SFRC) has become a common material in areas such as underground shotcrete structures and industrial floors
The full-scale beams were reinforced with high-grade steel bars
The present study is dedicated to the experimental investigation of the post-cracking behaviour of steel fibre reinforced concrete beams made of concrete with aggregates and fibres provided by Lithuanian companies
Summary
Steel fibre reinforced concrete (SFRC) has become a common material in areas such as underground shotcrete structures and industrial floors. Steel fibre reinforcement becomes effective after the concrete cracking initiation and, mostly, improves the post-cracking behaviour, due to the stress transfer mechanisms provided by fibres bridging cracked sections (Gribniak et al 2016). A cracked section is capable to carry tensile stresses This effect is known as the residual strength of cracked SFRC in tension. One of the most important properties of SFRC is its ability to transfer tensile stresses across a cracked section It is strongly dependent on the effectiveness of the fibre reinforcement (closely related to fibre geometry, strength, and bond with concrete) as well as fibre orientation and distribution in the cracked section (Vandewalle 2000). Effectiveness of the application of the minimum content of the fibres in combination with bar reinforcement was revealed throughout the tests
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