ABSTRACT
The composite girder cable-stayed bridge has been widely used in engineering for its advantages of light weight and large spanning ability. However, most of the current research mainly focused on the thickness of concrete bridge decks ranging from 25 cm to 30 cm, and there is a lack of research on the mechanical properties of thick concrete decks at side span of long-span cable-stayed bridges. Therefore, this study was carried out to solve the above existing problems. Based on a composite truss girder cable-stayed bridge with a main span of 930 m, the stress performance and reasonable structure of the concrete deck at side span of 46.8cm are studied. First, in order to determine the most unfavorable position of the side span, a multi-scale model was established. Then, considered the dead load and live load effect, the refined analysis framework was developed. The results shown the longitudinal stress in the concrete deck is uneven along the transverse direction, especially in the cable anchorage section, and a small tensile stress appears on the upper surface of concrete deck near the auxiliary pier. In addition, the transverse stress is the smallest at the upper chords on both sides along the width direction Along the thickness direction, the stress on the upper surface of concrete deck is the most unfavorable, the stress is gradually decreasing from top to bottom surface.
