الفهرس | Only 14 pages are availabe for public view |
Abstract Previous studies have shown that fibers improve concrete performance specially in shear, steel fibers were the most popular type of fibers introduced as an effective solution increases shear resistance. The degree of improvement gained in shear strength exhibited by Steel Fiber Concrete, SFC, is dependent on a number of factors. Steel fiber was chosen because of high ductile behavior that this type of fibers adds to concrete. The principle objective of this study is to investigate the shear capacity and shear response of low volume steel fiber concrete due to two types of loading defined as static and repeated. Low volume fibers had chosen to find an economic solution for using steel fibers in practice (Vf < 1 %) with a guaranteeing suitable workability. Forty two push-off specimens were tested to investigate the shear strength variation for SFC - with low fiber content - under direct shear static and repeated stresses. Three groups of concrete with different compressive strength had prepared. Two types of steel fibers (corrugated and hooked end steel fiber) with three volume content (0.15, 0.30 and 0. 45) %. It was observed from the experimental results that the steel fibers enhance the shear capacity of concrete with steel fibers up to 25 % compared to plain concrete shear capacity, also steel fibers increase fatigue life. Results showed that the corrugated steel fiber shape gave some high performance rather than hooked end steel fiber shape. Based on fatigue test results for tested specimens, an empirical equation (regression analysis) is proposed to predict the fatigue life of SFC. |