Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments - Phase III
| 项目名称： | Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments - Phase III |
| 摘要： | The present research proposes the use of a numerically-based approach to develop improved design formulas for minimum riprap stone size for protection against erosion of spill-through abutments. Spill-through abutments are very common at small bridges where abutments are placed on the floodplain. The mean flow fields predicted using fully 3-D RANS simulations are used to estimate the maximum bed shear stress over the riprap layer and the critical Froude number corresponding to the shear-failure entrainment threshold for the riprap stone. During the first year, the numerically-based approach was validated for the case of wing-wall abutments placed in a straight channel. During the second year, a new two-parameter formula was proposed for riprap design at wing-wall abutments. The new formula accounts for the influence of the nondimensional floodplain width and radius of curvature of the channel on the critical Froude number at which riprap shear failure occurs. During the third year, a comprehensive parametric study will be conducted that will provide the data needed to understand how channel curvature, floodplain width and relative length of the spill-through abutment influence the peak bed shear stress over the riprap regions. The main goal will be to develop a multi-parameter formula for riprap design at spill-through abutments placed in straight and curved channels as a function of the nondimensional floodplain width, ratio of abutment length to floodplain width, nondimensional riprap stone size and radius of curvature of the channel. These series of simulations will also allow better understanding the limitations of presently available riprap design formulas proposed for spill-through abutments placed in straight channels and the performance of the Set Back Ratio formula used to estimate the velocity in the critical Froude number. Recommendations will be made for inclusion of the new design formula in future versions of HEC-23. |
| 状态： | Completed |
| 资金： | 149751 |
| 资助组织： | Mid-America Transportation Center<==>Office of the Assistant Secretary for Research and Technology |
| 执行机构： | University of Iowa, Mechanical and Industrial Engineering |
| 开始时间： | 20191213 |
| 预计完成日期： | 20201231 |
| 主题领域： | Bridges and other structures；Design；Highways；Hydraulics and Hydrology |
相关文献
- Development of new design guidelines for protection against erosion at bridge abutments - Phase V
- Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments - Phase IV
- Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments and Embankments � Phase II
- Development of New Design Guidelines for Protection Against Erosion at Bridge Abutments and Embankments - Phase I
- 3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap Aggregates - Phase 2
- Increase Service Life at Bridge Ends through Improved Abutment and Approach Slab Details and Water Management Practices TR-722
检索历史
应用推荐
