Yang X.-Q.,China Communications Construction Company Ltd. |
Li Y.,Hubei Provincial Transport Planning and Design Institute
Bridge Construction | Year: 2015
To study the influences of the bond acting forces between the casting materials and steel plate, the tenon acting forces in the shear pockets and through reinforcement acting forces on the bearing capacity of the PBL shear connectors, the actual structures of the shear connectors used for the steel and concrete joint section of a hybrid girder cable-stayed bridge were taken as a case study. The C55 concrete and the reactive powder concrete (RPC) were respectively used as the casting materials, 16 PBL shear connector specimens were designed and fabricated, the plug-in load tests of the single plate were made and the load~relative slip displacement curves, the failure modes of the specimens and the proportions of the various acting forces accounting for the total bearing capacity of the shear connectors were analyzed. The results of the analysis show that the specimens are all the shear transfer components that fail in shear. As regards the bearing capacity and ductility, the specimens using the RPC as the casting material are superior to those using the C55 concrete. After the through reinforcement are arranged, the bearing capacity and ductility of the shear connectors have been significantly increased and the bond acting forces, tenon acting forces and through reinforcement acting forces respectively account for about 20%, 40% and 40% of the total bearing capacity of the shear connectors. ©, 2015, Wuhan Bridge Research Institute. All right reserved.
Zhang J.-Y.,Hubei Provincial Transport Planning and Design Institute |
Ding W.-X.,Hubei Provincial Transport Planning and Design Institute |
Zhu S.-F.,Bridge Science Research Institute LTD
Bridge Construction | Year: 2015
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.
Yuan R.-Z.,Hubei Provincial Transport Planning and Design Institute |
Zhang M.-J.,Hubei Provincial Transport Planning and Design Institute |
Zhang M.-J.,Southwest Jiaotong University |
Gan X.-J.,Hubei Provincial Transport Planning and Design Institute
Bridge Construction | Year: 2013
The main bridge of Yunshi Hanjiang River Bridge is a prestressed concrete extradosed bridge with double pylons, a single cable plane and with span arrangement (128+238+128) m. The main girder of the bridge is the concrete continuous triple-cell single box girder of long cantilevers and variable sections. The pylons, each being 39.9 m high, are the single-column concrete structures and are designed into the structural form of rigid fixity of the pylons, girder and piers. The stay cables are arranged in fan shape and the piers of the pylons are supported on the group bored pile foundations. In the design, the software MIDAS Civil was used to establish the finite element model for the whole bridge and to carry out the global calculation of the bridge, the stress analysis of the stay cables and the dynamic behavior of the whole bridge. The software ANSYS was used as well to establish the finite element model for the segments of the main girder and to carry out the local stress analysis of the bridge. The results of the calculation and analysis indicate that the global structure of the bridge is safe and reliable and the structure can meet the requirements for highway vehicle riding safety and comfort. No significant local stress concentration appears in the main girder, the stress amplitude values of the stay cables are within 30 MPa and the structure can meet the requirements for durability in the service process of the bridge.