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Fatigue Tests of Welded Joints in Steel Orthotropic Bridge Deck

100%

Siwowski T. , Kulpa M.

Czasopismo Inżynierii Lądowej, Środowiska i Architektury / Journal of Civil Engineering, Environment and Architecture

2018

tom z. 65, nr 2

157--166

The procedure supported by testing has been used for the fatigue assessment of the existing steel bridge with the orthotropic deck, built in the early 80’s of the XX century. The main goal was to check if the remaining fatigue life of the existing steel deck is at least 25 years, without the need of extensive repair or strengthening. The assessment comprised the fatigue calculation according to European codes with the use of updated values for material resistance. In order to obtain the updated information on material resistance the fatigue testing was carried out and the actual fatigue resistance ∆σC was applied in damage accumulation calculation. The fatigue tests were carried out for two most critical deck details. Test specimens were cut out of the existing deck at the locations where the preliminary analysis showed the possible highest stress ranges. The assessment based on the actual material resistance revealed that the bridge deck had got very long service life. The main results of the fatigue assessment of orthotropic steel deck supported by testing have been presented in the paper.

Probabilistic simulation of responses of orthotropic-deck bridge under random live load

63%

Mishra S. R. , Shelke A. , Mishra S. K.

tom Vol. 15, no 1

139-160

We present a simulation based study of the probabilistic responses of an orthotropic deck steel bridge subjected to random live load, given the fact that a better understanding of such responses is important for improved design of this class of structures. These structures are gaining increasing popularity for the ease of construction. Probabilistic characterization also provides important measures of structural safety and reliability. With this aim as the eventual goal, we first develop a stochastic model of the live load on bridges based on the available data. Owing to a wide variability in the vehicle (contributing to live loading) data we classify the vehicles into several classes. Individual groups are characterized by the probabilistic measures (mean, standard deviation, distributions). Following previous studies, we adopted power law fluctuations of the velocity spectra in simulating individual vehicle speed and the arrival of vehicles is considered to follow a Poisson process. We then simulate the realization of a random queue on vehicle lanes using the Monte Carlo framework. With this set up of the loading process, we choose a precise finite element technique for modeling of the orthotropic deck (steel). A linear dynamic time history analysis is performed under this loading. Finally, the probabilistic parameters of the response quantities are obtained from these time histories. Parametric sensitivity of the selected response quantities is also presented.

Fatigue stress analysis of orthotropic steel bridge decks in Xinghai Bay Cross-sea Bridge

51%

Li W. , Qin S. , Wang H.

tom Vol. 66, nr 1

327--340

Fatigue properties of orthotropic steel bridge deck of Xinghai Bay Cross-sea Bridge in Dalian were analyzed. The segment model of orthotropic bridge deck was established by using the finite element software Abaqus. The intersection between diaphragm and U-rib was selected to analysis. The fatigue loading model III was adopted which was provided by “Specifications for Design of Highway Steel Bridge”. First, the transverse stress influence line and the transverse severest loading position were determined. Then, five loading regions were selected near the transverse severest position. The stress amplitude of the intersection was ascertained through loading on the longitudinal bridge for each region. Finally, the fatigue checking for the intersection was carried out. The results showed that the maximum fatigue stress amplitude of orthotropic deck in Xinghai Bay Cross-sea Bridge met the requirements of "Specifications for Design of Highway Steel Bridge".