Strain-hardening effect on the flexural behavior of ultra-high-performance fiber-reinforced concrete beams with steel rebars
DEVELOPMENTS IN THE BUILT ENVIRONMENT(2024)
摘要
This study evaluated the effects of volume fraction, aspect ratio, and shape of steel fibers on the mechanical properties of ultra -high-performance fiber -reinforced concrete (UHPFRC) and the structural behavior of reinforced (R-) UHPFRC beams. The tensile strength and energy absorption capacity of ultra -high-performance concrete (UHPC) are improved by adding steel fibers and increasing its volume contents by up to 3.0 %. Compared with short straight steel fiber, medium -length straight and twisted fibers at a volume fraction of 2.0 % result in twice higher energy absorption capacity and higher flexural strength of R-UHPFRC beams. The flexural strength of R-UHPC beams increases by increasing the fiber content up to 3.0 %. However, the strain -hardening characteristics of UHPFRC negatively influence the cracking behavior and stress redistribution in structural beams, causing 48.2-54.1 % lower ultimate ductility indices. The small amounts of steel fibers with volume fraction of <= 1.0 % that exhibit strain -softening behavior only improve the peak ductility.
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关键词
Ultra-high-performance fiber-reinforced concrete,Steel fiber effect,Tensile characteristics,Ductility,Fiber orientation coefficient,Inverse analysis
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