Concepts of Developing Traffic Load Model for Multi-Span Cable Supported Bridges

Traffic load effects of multi-span, cable-supported bridges are significantly different from those of small- and medium-span bridges. However, the current traffic load codes are generally specified for small- and medium-span bridges, which are extremely conservative for the design of multi-span, cable-supported bridges. A profound and comprehensive review on existing research of traffic load models for large span bridges is presented, providing theoretical foundation for the concepts of performance-based traffic load models. Different structure performance levels, design states and parameters are discussed under varied traffic load service levels. Novel techniques in related traffic load research fields are introduced to explore the possible performance-based design methodology and process. Application of the traffic load effect analysis is stated by two practical examples. According to the results, it is indicated that concepts of performance-based design are more accurate and efficient for the traffic load effect and provide the structure optimization with favorable conditions.