It appears that the superstructure is supported by large steel bearings at the towers. The bearings would have to handle quite a bit of movement due to thermal expansion and contraction of the superstructure.
Until the 1990s, there were no bridges across the Huangpu River in Shanghai (there were two tunnels). Then the Nanpu Bridge was built in 1991 and the Yangpu bridge was built two years later. Several more bridges across the Haungpu have now been built in response to the cities growth and increased prosperity. I wonder if cities build most of their bridges during a single period of economic expansion?
Shanghai's Bridges: Yangpu Bridge (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.