Details:

Creators:
Hahin, Christopher ; South, Jeffrey M,
Hahin, Christopher ; South, Jeffrey M, Less -
Corporate Contributors:
Illinois. Dept. of Transportation ; United States. Federal Highway Administration
Illinois. Dept. of Transportation ; United States. Federal Highway Administration Less -
Subject/TRT Terms:
[+]
Bridge Superstructures Tests Traffic Loads Vehicle Weight
Resource Type:
Tech Report
TRIS Online Accession Number:
629103
NTL Classification:
NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures
Abstract:
Fifteen representative steel bridges throughout the State of Illinois were

instrumented with foil strain gages to determine their frequencies of loading

and the magnitudes of stresses induced by traffic over a 3 to 8-hour period,

depending on traffic volume. Reinforced prestressed or post-tensioned concrete

bridges were not included in this study. Fatigue prone details, such as cover

plated wide flanges, were instrumented. For each stress range increment

gathered by the data acquisition system, the cumulative damage sustained over

an extended number of years was compared with the number of available fatigue

cycles for that stress range using published S-N data for various details and

the Palmgren Miner linear damage rule. A new equation for factor of safety

for structural details subject to fatigue is described, taking dead load, live

load, and bridge detail fatigue strengths into account. A new histogram-linear

damage method of assessing future fatigue damage in bridges which takes

traffic growth and increased truck weights Into account is also described.

Other non-welded designs to main load carrying members were examined for

susceptibility to fatigue effects, including riveted beams, weathering steels,

reinforced concrete in air (without severe cracking), and post-tensioned beams

through a review and discussion of the literature. The actual effect of an

increase in gross vehicle weight on the measured maximum stress range response

of a particular bridge was measured. The histogram-linear damage method

favorably compared with the root mean cube-linear damage method and to the

fatigue damage procedures given in NCHRP 299.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:0fe50dce820e4f80c5292c7c1a6ff5d69e556534aa3d2ff4299f34059e30192d
Download URL:
https://rosap.ntl.bts.gov/view/dot/13399/dot_13399_DS1.pdf
File Type:

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