Details:

Creators:
Musete, Marian ; Ho, Hao-Che
Musete, Marian ; Ho, Hao-Che Less -
Corporate Creators:
University of Iowa
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Box Culverts Cast In Place Concrete Coefficients Concrete Culverts Hydraulics Precast Concrete Reinforced Concrete
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.


Format:
PDF
Funding:
RT-1021
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:ad7f0b3c46ac36b1924d3ebbbbe1648c96d4437b9812274f9202c81bae50d366
Download URL:
https://rosap.ntl.bts.gov/view/dot/25559/dot_25559_DS1.pdf
File Type:

Supporting Files

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