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Introducing precast concrete bridges to the United States
| 题名： | Introducing precast concrete bridges to the United States |
| 正文语种： | eng |
| 作者： | Andrew Osborn;Hclmuth Wilden |
| 作者单位： | Wiss Janney Elstner Associates Inc.;Wilden Enterprises Inc. |
| 关键词： | Bridge; girder; prestressed concrete; sandwich plate; Walnut Lane Memorial Bridge |
| 摘要： | In this column, our focus over the past year has been to show the influence and benefits of past PCI-funded research and development projects on current design and construction practices with precast concrete. In this issue on innovation, we chose to deviate from what we've done and describe the first prestressed concrete bridge built in the United States, the Walnut Lane Memorial Bridge in Philadelphia, Pa., which was completed in 1950. As part of the original design and construction, a full-scale girder was tested to destruction to demonstrate the adequacy of design of this previously unknown (to U.S. engineers) structural system: prestressed concrete. PCI had no role in funding this test since PCI did not exist until 1954, four years after the bridge was built. The use of prestressed concrete for this purpose in the United States was truly innovative. A confluence of events was necessary to bring it about. Although the bridge was actually a post-tensioned structure, each girder was cast at a set location on falsework, tendons were stressed, and ducts were grouted, and then the girder was slid on rails to its final position making it somewhat like what we call precast, prestressed today. |
| 出版年： | 2023 |
| 期刊名称： | PCI Journal |
| 卷： | 68 |
| 期： | 6 |
| 页码： | 20-23 |
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