The main bridge of the Zhongxing Bridge is a hybrid girder extradosed cable-stayed bridge with a span arrangement of (64+86) m + 400 m + (86+64) m. A pedestrian and nonmotorized vehicle (hereafter referred to as a “pedestrian/bicycle”) crossing channel is designed to traverse the river along the main bridge. In this paper, the design scheme of this pedestrian/bicycle channel is investigated in terms of structural mechanics, structural detailing, economy, and maintenance. The design scheme features a vertical separation of vehicle and pedestrian/bicycle traffic, in which the pedestrian/bicycle system is located outside the webs of the box girder. To decouple the structural connection between the main bridge and the pedestrian/bicycle channel, thereby reducing the effect of the main bridge forces on the channel structure, longitudinal and transverse expansion joints were installed and the installation sequence of the channel was optimized. A computational analysis was performed using the finite element software Midas Civil. The results indicate that the previously mentioned methods can significantly reduce structural stress. Furthermore, analyses of pedestrian comfort and the structural performance of the pedestrian staircase were conducted. The results indicate that this pedestrian/bicycle channel can satisfy both static and dynamic requirements.
Zhang Chunlei (Thu,) studied this question.