Test And Reinforcement Design Research On Leiyang Dongzhou Park Pedestrian Suspension Bridge

Abstract:Pedestrian suspension bridge, with its graceful lines, novel appearance and location advantages of flexible, has been widely used in the mountains and attractions. But the stiffness and the anti-risk ability of such bridges are small. In order to ensure the safety during its operations period, its maintenance and reinforcement is particularly important. The span of Leiyang Dongzhou Park pedestrian suspension bridge is111.58m and it was built in2001. During the operation time, because of the anchor was soaked by flood, the load increased and other factors, some diseases such as cable clamp slip, boom offset, anchor displacement, stiffness degradation and so on are appeared. Against this background, research work combined with the bridge inspection and reinforcement were carried out. The main work and contribution of this paper are as follows:1. To obtain the status of the bridge and compensate for the insufficient completion data of the bridge, some inspection work of this bridge were implemented, which included appearance inspection, disease investigation, linear measurement, the main cable force measurement, boom force measurement, dynamic characteristics test and so on. The above work laid the foundation of mechanical analysis, evaluating the performance of the bridge and reinforcement design.2. Finite element model was built by Midas to implement computer simulation analysis. Because of its large difference between the measured cable shape and the original design of linear, a calculation model coincide with the measured structure should be found. Based on the measured data, and the measured linear and cable forces as the target, a finite element model could be modeled through the iteration. On the basis of this finite element model, theoretical analysis and reinforcement design could be implemented.3. The effects of wind cables and its contribution to the stiffness of the whole bridge is discussed and the necessity of wind cables is further demonstrated.4. Cable clamps in original structural design appeared slip, which led to the sling offset phenomenon. The structure of cable clamps, slings area, sling replacement methods and its technology were studied in this paper combined with ideas to improve the deck stiffness in the reinforcement design.5. On the main cable anchor immersed in water under conditions of stress analysis and the basis for displacement analysis, the effects of this condition was studied theoretically and concrete reinforcement measures was proposed.6. Based on theoretical analysis above, a full set of technical measures of the reinforcement design of the bridge were proposed, and the effect after reinforcement was good.105Figures,39Tables,50References...