Design live load model for long span bridges

This paper deals with the development of live load model for long span bridges. New live load model reflects real truck traffic data in Korea using Weigh-In-Motion system that was installed on the road with the heaviest truck traffic volume. By using collected WIM data, various truck traffic scenarios are considered assuming traffic jam condition. To analyze the load effect, typical long span bridge such as a suspension bridge and a cable stayed bridge are modeled by the structural analysis program. Based on the traffic scenarios, equivalent uniformly distributed load (EUDL) are calculated and loaded to the selected bridge. Based on the results of analyses, new live load model for long span bridges for Korea Bridge Design Code (LSD) is proposed as a combination of design truck and design lane load which the magnitude is decreased as influence line length become longer. Effects of effective influence line length are also analysed to specify the guideline for loading method of design lane load model.