Structural Type Selection for long-span bridges in mountain area

As the western region is a mountainous area with geology complicated geological conditions, the proportion of bridges and tunnels is bigger. Based on the characteristic of mountainous route and long-span bridges, this paper discussed the conceptual design of mountainous bridges. Firstly, this paper analyzes the characteristic of mountainous long-span bridges and proposed some fundamental principles to design long-span bridges. After the comparison of the main bridge structures, the paper points out that the designer should select the best programs considering hydrological, geological, geomorphology, construction technology, transportation, geographical environment and social environment. The purpose of this paper is to give reference for the conceptual design of mountainous long-span bridges.