Influence Of Wheel Load Transverse Distribution On Fatigue Of Orthotropic Steel Deck Structure Details

Because of the big advantages of light weight, good bearing capacity and fast construction speed, orthotropic steel deck had been widely used in long-span steel bridge.However, as a result of orthotropic steel deck was welding of thin-walled components and directly under the wheel load, it was easy to suffer from fatigue damage. Fatigue crack seriously affected the safety and durability of the steel bridge.An important work in the study of fatigue of orthotropic steel deck was to determine the stress spectrum of the structural details during the life of the bridge.Europe, Japan and the United States had obtained fatigue load spectrum suitable for their own country through long-term observation on the road.Meanwhile,when the vehicle traveling different lateral position on the deck,the stress cycle characteristics of orthotropic steel deck structural details was different,and the probability of stress peak occurrence would reduce. Different wheel load transverse distribution had different effects on the stress spectrum. Europe, Japan and the United States had considered the effect of transverse distribution on equivalent stress amplitude when calculating the stress spectrum without exception,and was reflected in the design specification in the form of stress amplitude reduction factor.But China didn’t have fatigue load spectrum available for the design yet,and usually used single trace mode when calculating the stress spectrum of structural details,which leads to calculated stress spectrum different from the true stress spectrum. In this paper, the effect of wheel load transverse distribution on orthotropic steel deck fatigue behavior was studied.The main work of this paper is as follows:①he development and current status of the fatigue design of orthotropic steel deck were retrospected,and the current analysis and assessment methods of orthotropic steel panel fatigue were summarized;②The research results about wheel load transverse distribution in Europe, Japan and the United States were collected,and were compared with part of the domestic highway bridge wheel load transverse distribution statistics. ③hree models of orthotropic steel deck with typical structure characteristics was established, considering wheel load transverse distribution observed by domestic scholars, the stress cycle features of various structural details was obtained by finite element analysis. According to Miner linear cumulative damage criterion, the effect of wheel load transverse distribution on typical orthotropic steel deck structural details was analyzed. The stress amplitude reduction factor was obtained, which was suggested taking0.85.