Determination of entrance loss coefficients for pre-cast reinforced concrete box culverts.

Details

• Creators:
  Musete, Marian ; Ho, Hao-Che
• Corporate Creators:
  University of Iowa
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Cast in place concrete
  • Precast concrete
  • Box culverts
  • Coefficients
  • Reinforced concrete
  • Hydraulics
  • Precast concrete
  • Reinforced concrete
  • Concrete culverts
  • Hydraulics
• Publication/ Report Number:
  SPR 90-00-CULV-011
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Edition:
  Final report.
• Corporate Publisher:
  Iowa. Dept. of Transportation
• Abstract:
  There is an increased interest in constructing Pre-Cast (PC) Twin and Triple Reinforced Concrete Box (RCB) culverts ; in Iowa due to the efficiency associated with their production in controlled environment and decrease of the construction ; time at the culvert sites. The design of the multi-barrel PC culverts is, however, based on guidelines for single-barrel cast-inplace ; (CIP) culverts despite that the PC and CIP culverts have different geometry. There is scarce information for multiplebarrel ; RCB culverts in general and even fewer on culverts with straight wingwalls as those designed by Iowa DOT. Overall, ; the transition from CIP to PC culverts requires additional information for improving the design specifications currently in ; use. Motivated by the need to fill these gaps, an experimental study was undertaken by IIHR-Hydroscience & Engineering. ; The goals of the study are to document flow performance curves and head losses at the culvert entrance for a various culvert ; geometry, flow conditions, and settings. The tests included single-, double- and triple-barrel PC and CIP culverts with two ; span-to-rise ratios set on mild and steep slopes. The tests also included optimization of the culvert geometry entrance by ; considering various configurations for the top bevel. ; The overall conclusion of the study is that by and large the current Iowa DOT design specifications for CIP culverts can ; be used for multi-barrel PC culvert design. For unsubmerged flow conditions the difference in the hydraulic performance ; curves and headloss coefficients for PC and CIP culverts are within the experimental uncertainty. Larger differences ; (specified by the study) are found for submerged conditions when the flow is increasingly constricted at the entrance in the ; culvert. The observed differentiation is less important for multi-barrel culverts as the influence of the wingwalls decreases ; with the increase of the number of barrels.
  More +
• Format:
  PDF
• Funding:
  RT-1021
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25559/dot_25559_DS1.pdf
• File Type:
  [PDF - 2.15 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f1b97592e883649bf543730ff4e67178a8e212bb9ec5592b75ea5bc965088f05b53e798ecc1d05d1c6be492e804b417fb80bbe5e2281690b05f6ba33535384bb