Development of Guidelines for
the Use of Intermediate
Diaphragms on Precast
Concrete Beam Superstructures
| 项目名称： | Development of Guidelines for the Use of Intermediate Diaphragms on Precast Concrete Beam Superstructures |
| 摘要： | While there is clear guidance in both MDOT and AASHTO Bridge Design Standards for the use of intermediate diaphragms in bridge superstructures of all types that support a curved road (a radius of curvature of 800 feet or less) and for highly skewed (skew angle of 30 degrees or more) bridges, the guidance for the use of intermediate diaphragms on precast concrete bridges on a straight roadway and with a skew of less than 30 degrees is less clear if not silent. MDOT has surveyed other States in the past to determine their practice for the use of intermediate diaphragms but has found little consistency. With the increased use of precast concrete spread box beam and bulb tee beams, whose cross sections result in an increased resistance to lateral displacement or torsional rotation during the construction of a bridge superstructure, engineering judgement seems to suggest that the number of intermediate diaphragms may be able to be reduced if the need for the intermediate diaphragms isn’t eliminated entirely. Reducing the number of intermediate diaphragms could decrease the cost of the project, decrease the duration of construction, and result in more durable superstructures. |
| 状态： | Active |
| 资助组织： | Michigan Department of Transportation |
| 执行机构： | Western Michigan University |
| 开始时间： | 20191001 |
| 预计完成日期： | 20210731 |
| 主题领域： | Bridges and other structures |
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