Modification of Existing Prestressed Girder Cross-Sections for the Optimal Structural Use of Ultra-High Performance Concrete
| 项目名称： | Modification of Existing Prestressed Girder Cross-Sections for the Optimal Structural Use of Ultra-High Performance Concrete |
| 摘要： | The first stage of implementing UHPC into the bridge inventory in many States will likely be to use it in place of HPC in standard prestressed I-girders. These standard I-girders were designed for use with certain strengths of concrete, and are not structurally optimized for the high compressive strength and useable tensile capacity of UHPC. Research to date has demonstrated that the material characteristics of UHPC are well suited for use in precast bridge components, but that existing component cross-sections cast with UHPC exhibit excessively large reserve capacities. The leap between common prestressed girder designs and designs that are fully optimized for the properties of UHPC may be too great for many State Departments of Transportation. As such, an intermediate step wherein the bridge owner can become acquainted with the advanced properties of UHPC while still utilizing a familiar structural shape is necessary. This intermediate step also is valuable to other links in the supply chain (i.e., designer, fabricator, erector) as it will allow this traditionally risk averse industry to experience an advancement in the state-of-the-art without incurring what they perceive to be excessive risks. Therefore, the purpose of this research program is to investigate existing bridge girder cross-sections to determine which are best suited to modification for use with UHPC. This analytical study considers factors including structural efficiency in flexure, structural efficiency in shear, pre- and post-tensioning, popularity of the underlying structural form, and ease of existing girder shape modification to achieve desired form. |
| 状态： | Completed |
| 资金： | 0.00 |
| 资助组织： | Federal Highway Administration |
| 项目负责人： | Graybeal, Benjamin A |
| 执行机构： | Virginia Polytechnic Institute and State University, Blacksburg |
| 开始时间： | 20060000 |
| 实际结束时间： | 20090000 |
| 主题领域： | Bridges and other structures；Construction；Design；Highways；Research |
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