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Hong H.,Southwest Jiaotong University | Zheng S.,Southwest Jiaotong University | Jia H.,Southwest Jiaotong University | Yu L.,Southwest Jiaotong University | Gao J.,Construction Headquarters of Wusu Bridge in Heixiazi Island
WIT Transactions on the Built Environment | Year: 2013

Based on the stochastic vibration theory, the finite element model was presented. Spatial effects, including the site effect, coherent effect and traveling wave effect were accounted for a high-pier bridge with different pier heights under multipoint random excitation of strong earthquakes. The results showed that the seismic response was obviously influenced by the site effect. Compared with the site effect, the coherent effect caused minor impact and the traveling wave effect had a minimal impact. The responses of bridges with different piers would vary significantly when considering spatial effects. © 2013 WIT Press. Source


Xiao H.-Z.,China Railway Major Bridge Reconnaissance and Design Group Co. | Zhang D.-L.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Li X.-Z.,Southwest Jiaotong University | Gao Z.-Y.,China Railway Major Bridge Reconnaissance and Design Group Co.
Bridge Construction | Year: 2013

In the light of the characteristics that the transportation to the site of the Wusu Bridge in Heixiazi Island is inconvenient, the weather is cold and the utilizable construction time in a year is short, the main bridge of the bridge is designed as a long cantilever steel box composite girder cable-stayed bridge with a single pylon, a single cable plane and with span arrangement 140+140 m. The main girder of the bridge is made up of the steel box girder, steel cantilevers and concrete deck slabs. The total width of the main girder is 26.5 m and the length of the cantilever on one side of the bridge is 10.75 m. The pylon is a single column concrete structure and is 117 m in height. A stay cable is the one having 163 nos.of diameter 7 mm low-relaxation and high-strength galvanized parallel steel wires and the stay cables are arranged in harp shape. In the design of the bridge, several key techniques, such as the torsion and shear lag effect of the main girder and the force conditions of the deck slabs, are studied and analyzed. The results of the study and analysis show that the shear stress caused by the torsion is 33 MPa and the stress can meet the relevant requirements in the codes. The torsional angle is 0.007 rad and the angle will not affect the service function of the bridge. Most of the shear lag coefficients of the main girder are less than 2.0 and locally the coefficients will be up to 4.0. The strength and crack width of the deck slabs can meet the requirements in the codes as well. Source


Liu B.-F.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Gao J.-H.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Yang L.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Li X.-Z.,Southwest Jiaotong University
Bridge Construction | Year: 2013

The main bridge of the Wusu Bridge in Heixiazi Island is a long cantilever steel box composite girder cable-stayed bridge with a single pylon, a single cable plane and with span arrangement (140+140) m. The stay cables and main girder of the bridge are connected, using the steel anchor box cable-to-girder anchorage structure. To ensure the safety of the structure at the service stage, the combined method of the finite element analysis and full-scale model static force test was used to study the load paths, stress distribution and safety of the structure respectively under the action of 1.0 time and 1.7 times of the maximum designed stay cable force. The results of the study demonstrate that under the action of the 1.0 time of the maximum designed stay cable force, the stay cable force transfers to the steel anchor box webs via the welding seams of the bearing plate and top plate of the anchor box and then transfers to the main girder via the welding seams of the anchor box webs and main girder webs. The load paths are clear and the integral stress level is low. Under the action of the 1.7 times of the maximum designed cable force, the structure remains elastic, the force conditions of the structure are rational and the structure has sufficient safety margin. Source


Gao J.-H.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Yang L.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Sun W.-G.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Li X.-Z.,Southwest Jiaotong University
Bridge Construction | Year: 2013

The main bridge of the Wusu Bridge in Heixiazi Island is a long cantilever steel box composite girder cable-stayed bridge with a single pylon, a single cable plane and with span arrangement (140+140) m. The stay cables and main girder of the bridge are connected, using the steel anchor box cable-to-girder anchorage structure. To ensure the safety of the structure at the service stage, the finite element software ANSYS was used to set up the model for the single block steel box girder and the stress distribution of the structure under the designed stay cable forces was analyzed. The full-scale model for the structure was fabricated as well and the test study of the fatigue performance of the model was carried out under the condition of 500 kN fatigue load amplitude, using the equivalent method of fatigue accumulative damage and with reference to the designed traffic flow of the bridge and the related foreign codes. The results of the test study indicate that under the action of the fatigue load, the stress of the structure is far less than the allowable values as specified in the codes, the fatigue resistance performance of the structure can satisfy the service requirements and the structure has good durability and sufficient safety margin. Source


Zheng S.,Southwest Jiaotong University | Hong H.,Southwest Jiaotong University | Gao J.,Construction Headquarters of Wusu Bridge in Heixiazi Island | Tang Z.,Southwest Jiaotong University | Jia H.,Southwest Jiaotong University
WIT Transactions on the Built Environment | Year: 2013

In order to select the optimal fluid viscous damper for a long-span cable-stayed bridge, sensitivity research on seismic behavior of a practical bridge with different linear viscous dampers was conducted through dynamic time-history analysis. The earthquake responses were considered as random variables and the numerical characteristics of variables were analyzed. The concept of compositive optimal control and response function was put forward and the reasonable coefficient C of the damper could be found through numerical curve fitting. The shock absorption effect of the damper would be more comprehensive by considering more responses and using the compositive response functions. © 2013 WIT Press. Source

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