Analysis of steel anchor beam structural system of anchorage in pylon of Jingyue Changjiang River Highway Bridge

The main bridge of Jingyue Changjiang River Highway Bridge is a asymmetric span hybrid girder cable-stayed bridge with double pylons and with a main span of 816 m. The anchorage in a pylon of the bridge in completion state is of the steel anchor beam structural system with its two ends being fixed. To study the function of the anchor beam balancing the stay cable forces and to verify the rationality of the anchor beam of the statically indeterminate structural system, the software ANSYS was used to set up the finite element model for the anchorage in the pylon, 2 different support schemes adopted for construction of the anchor beam were analyzed and the ratios of the stay cable forces distributed by the anchor beam were studied by means of the full-scale model tests. The results of the study show that the anchor beam using the structural system with its side span end being fixed, its central span end being slide at the time of initial tensioning of the stay cables and with its two ends being fixed after tensioning of the stay cables can bear 83.7% horizontal component of the stay cable forces and the ratio of the horizontal component distributed by the anchor beam and pylon wall is 8:2, proving that the anchor beam can play the role of balancing the stay cable forces and is also structurally highly reliable. ©, 2015, Wuhan Bridge Research Institute. All right reserved.