ABSTRACT
Composite cable-stayed bridge is more and more widely used, which fills the economic gap between traditional concrete cable-stayed bridge and steel girder cable-stayed bridge. This paper studied the behavior of composite truss girder with thicker concrete, based on a composite truss girder cable-stayed bridge with thicker concrete at side span. The multiple scale models of the whole bridge were established to investigate the distribution of normal stress of concrete and steel truss under dead load and live load. The finite element results showed that the stress of concrete is main compressive stress, and the distribution of stress of cable section concrete is uneven with obvious shear lag phenomenon. The stress of lower chord at the pier’s top section is large. As the thickness of concrete increases, the stress distribution becomes more uniform, and the thickness of concrete is recommended to be 40 cm ~ 50 cm.
