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Determination of fatigue safety and remaining fatigue life on a riveted railway bridge by measurement
J. Construct. Steel Res. Vol. 46, Nos. 1-3. pp. 430. paper number 327, 1998 01998 Elsevier Science Ltd. All tights reserved printed in Great Britain PIl: So143-974x(98)00197-1 0143-974X/98 $19.00 + 0.00
ELSEVIER
Determination of Fatigue Safety and Remaining Fatigue Life on a Riveted Railway Bridge by Measurement L. Korondi’,
A. Szittneti,
M. Kgill6’ and L. Krist6fz
‘Research Group for Applied Mechanics of the Hungarian Academy of Sciences at the TU Budapest, Department for Steel Structures, 1521 P.O. Box 91, Hungary ‘Department for Steel Structures, Technical University Budapest, 1521 P.O. BOX, Hungary Paper Number 327 Full paper on enclosed CD-ROM
In the presented paper an account of the results obtained by dynamic strain measurement on the stringers of the 40-year-old Budapest Southern Railway Bridge over the river Danube is given. To determine the fatigue state, an experimental investigation was fulfilled on the basis of actual load and the effective behaviour of the structure. For determining the fatigue load, a representative series of measurements was performed with the help of a sample involving 100 trains passing over the bridge. Stochastic distributions of stress oscillations arising in the most unfavourable points of the structure, caused by this actual live load, served as basis for the calculation of the yearly measure of damage and for the estimation of remaining fatigue life. Stress-time functions were analyzed according to the rain-flow method. The method used for the examination of fatigue damage, fatigue safety and remaining fatigue life expectation, respectively, is based on the traditional damage accumulation concept (Palmgren-Miner’s rule), also considering the prescriptions of the Hungarian Railway Bridge Standard (“VH 76”). To complete the information, laboratory control tests were carried out on standard fatigue test specimens cut out of one of the two stringer-sections removed from the bridge and replaced by new ones, while the second old stringer-piece was fatigue-tested in full size. As a result of the calculations and the fatigue tests, a complete replacement of the stringers was proposed to prepare by the time of the 50th anniversary of the bridge construction. 0 1998 Elsevier Science Ltd. All rights reserved
KEYWORDS
Railway, bridge, riveted, load test, fatigue, measurement, 430
damage, safety.
ELSEVIER
Determination of Fatigue Safety and Remaining Fatigue Life on a Riveted Railway Bridge by Measurement L. Korondi’,
A. Szittneti,
M. Kgill6’ and L. Krist6fz
‘Research Group for Applied Mechanics of the Hungarian Academy of Sciences at the TU Budapest, Department for Steel Structures, 1521 P.O. Box 91, Hungary ‘Department for Steel Structures, Technical University Budapest, 1521 P.O. BOX, Hungary Paper Number 327 Full paper on enclosed CD-ROM
In the presented paper an account of the results obtained by dynamic strain measurement on the stringers of the 40-year-old Budapest Southern Railway Bridge over the river Danube is given. To determine the fatigue state, an experimental investigation was fulfilled on the basis of actual load and the effective behaviour of the structure. For determining the fatigue load, a representative series of measurements was performed with the help of a sample involving 100 trains passing over the bridge. Stochastic distributions of stress oscillations arising in the most unfavourable points of the structure, caused by this actual live load, served as basis for the calculation of the yearly measure of damage and for the estimation of remaining fatigue life. Stress-time functions were analyzed according to the rain-flow method. The method used for the examination of fatigue damage, fatigue safety and remaining fatigue life expectation, respectively, is based on the traditional damage accumulation concept (Palmgren-Miner’s rule), also considering the prescriptions of the Hungarian Railway Bridge Standard (“VH 76”). To complete the information, laboratory control tests were carried out on standard fatigue test specimens cut out of one of the two stringer-sections removed from the bridge and replaced by new ones, while the second old stringer-piece was fatigue-tested in full size. As a result of the calculations and the fatigue tests, a complete replacement of the stringers was proposed to prepare by the time of the 50th anniversary of the bridge construction. 0 1998 Elsevier Science Ltd. All rights reserved
KEYWORDS
Railway, bridge, riveted, load test, fatigue, measurement, 430
damage, safety.