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Benefits of using 0.7 in. (18 mm) diameter strands in precast, pretensioned girders:A parametric investigation
| 题名： | Benefits of using 0.7 in. (18 mm) diameter strands in precast, pretensioned girders:A parametric investigation |
| 正文语种： | 英文 |
| 作者： | Jessica Salazar;Hossein Yousefpour;Alex Katz;Roya Alirezaei Abyaneh;Hyun su Kim, David Garber, Trevor Hrynyk;Oguzhan Bayrak |
| 作者单位： | University of Technology in Babol;Walker Restoration Consultants in Chicago;University of Texas at Austin;University in Miami |
| 关键词： | Box beam;bridge;bulb tee;girder;parametric study;prestressing;pretensioning;0.7 in. diameter strand;strand |
| 摘要： | This paper presents a parametric study on the benefits and limitations of using 0.7 in. (18 mm) diameter strands in precast, pretensioned concrete bridge girders. A validated parametric study tool was used to design a variety of Texas bulb-tee, U, and spread box beams and AASHTOI and bulb-tee girders with 0.5, 0.6, and 0.7 in. (13, 15, and 18 mm) diameter strands using different span lengths, concrete release strengths, and transverse spacings. The results were used to evaluate the effects of using 0.7 in. strands on the quantity of prestressing steel, span capability, attainable superstructure slenderness, and allowable spacing between girders. The most noticeable benefit of 0.7 in. strands over 0.6 in. strands was found to be a reduction of up to 35% in the number of strands. However, the difference in the total weight of prestressing steel was insignificant. Increasing the release strength of concrete, at least to 7.5 ksi (52 MPa), was found to be essential to observe benefits in design aspects other than the number of strands. |
| 出版日期： | 2017.11-12 |
| 出版年： | 2017 |
| 期刊名称： | PCI-Prestressed Concrete Institute Journal |
| 卷： | Vol.61 |
| 期： | No.06 |
| 页码： | 59-75 |
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