Splice Length of Steel Reinforcing Bars in Ultra high performance fiber reinforced concrete beams
| Autor: | Chih-WeiHuang, 黃智暐 |
|---|---|
| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Due to the lack of test data on the bond strength of deformed reinforcing bars embedded in Ultra-high performance fiber reinforced concrete (UHPFRC), ACI-318-19 building code requirements imposed an upper limit of 70 MPa on compressive strength of concrete that may be used in calculating tension development length and tension splice length. To evaluate the applicability of ACI-318-19 design provisions for calculating splice length of UHPFRC, sixteen simply supported beam specimens were fabricated and tested in this experimental program. Each beam was designed with two deformed bars spliced in a constant moment region on the tension side at mid-span. The test parameters include: 1) inclusion of the steel fiber, 2) splice length, 3) with and without coarse aggregate, and 4) bar size. Experimental results indicated that inclusion of a 1.5% volume ratio of fibers increased the bond strength between UHPFRC and reinforcing bars. Additionally, the splitting bond failure of beams with fibers were more ductile and allowed propagation of the flexural cracks extended upward to the top surface. The tesr results also show that UHPFRC beams could significantly reduced the required splice length based on ACI-318-19 design provisions, and the upper limitations of concrete strengths can be adjusted to over 100 MPa. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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