Simulation And Analysis Of Whole Bridge And Key Components Of Self-anchored Suspension Bridge

Self-anchored suspension bridge is a kind of suspension bridge with its main cable anchor on the ends of its girder directly. Therefore the expensive anchorage block is saved. On one hand, they are independent of geological condition; on the other hand, they can provide their girder with free prestress. In addition, they can have various aesthetic appearances. Due to all the advantages above, they are becoming more and more popular recently. However, there are many difficult problems still unsolved. Such as nonlinear influence analysis of self-anchored suspension bridges nonlinear at construction phase, complicated spatial calculation, analysis of cable clamp, anchorage cable sleeve, cable saddle and sling anchoring system and so on. To resolve these problems, combining domestic practices, the following tasks have been completed in this paper:1. To collect the correlative information about self-anchored suspension bridges at home and abroad, and to summarize their structure form, stress features and typical structure of their cable clamp, anchorage cable sleeve, cable saddle and sling anchoring system.2. Self-anchored suspension bridges nonlinear influence represent extraordinarily at construction phase. The paper summarizes material nonlinear, geometric nonlinear and contact nonlinear of the suspension bridges, discusses several commonly nonlinear equation calculated methods ,including direct solution method,increment method,Newton-Raphson ,and their convergence guide rule.3. Taking a self-anchored suspension bridge in Nanjing as background, analyze its response under various loads in completed phrase. The impact of different load is compared.4. Back Running Analysis of self-anchored suspension bridge during construction is performed. Change of internal forces and displacement of the bridge in construction was also studied in this paper.5. According the code, anti-slide reliability of cable clamp and anti-slide reliability of main cable in saddle groove are checked. Using finite element software ANSYS, establish solid finite element models of cable clamp, anchorage cable sleeve, anchorage cable saddle and main cable saddle to analyze their behaviors. Manual calculation is also used. The paths of force transfer are smmarized. The weakness zone are found and cheked.6. The Stress Distribution of concrete sling anchoring beam is analyzed by establishing solid finite element model of it. The path of force transfer is smmarized. The weakness zone are found and cheked.7. A 3D finite model composed of shell elements is used to analyze the stress disturbing of anchor box in steel girder. The path of force transfer is smmarized. The weakness zone was found and cheked.8. Comparing the results of this simulation with the design requirements, some unreasonable partial structure was found. Some suitable suggestions to impove the performance of this structure were also brought out.