Shear design of UHPC girders: A simplified and reliable model
This paper presents a simplified and reliable shear strength model for UHPC beams. The model construction was based on the statistical correlation between contributing variables and a complied experimental database of 198 specimens. The compiled database included different cross-sections, different...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025015804 |
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| Summary: | This paper presents a simplified and reliable shear strength model for UHPC beams. The model construction was based on the statistical correlation between contributing variables and a complied experimental database of 198 specimens. The compiled database included different cross-sections, different levels of prestressing, shear reinforcement ratios, and a range of material properties. The statistical correlation showed that the localization tensile strength and prestressing stress have the highest correlation with experimental shear strength, compared to concrete strength and the fibers' characteristics and volume. In addition, the height of the beams showed a higher correlation to the experimental database than the effective depth. Based on the correlation and reliability analyses, a simplified model was proposed and calibrated to achieve a reliability index of 3.5 (Vn=1.3(ft,loc+0.18fpc) bwd + Vs). Also, a prediction model for ft,loc was proposed. The proposed shear model resulted in an average and CoV of 1.29 and 25.8%, respectively, for the theoretical-to-experimental ratios. In addition, only three specimens had a shear strength ratio of less than 0.75, and 10 specimens had a strength ratio of more than 2.0. The model showed consistent conservatism across variables range. In comparison to other models, the proposed model and the FHWA model yielded the best performance with very similar statistical measures. However, the FHWA is a lengthy and iterative procedure. The ePCI showed a high conservatism with 30 specimens having (Vexp/Vpred.) of more than 2.0 due to fixing the UHPC tensile stress at 5.2 MPa. The AFGC procedure yielded the lowest accuracy. |
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| ISSN: | 2590-1230 |