Research On Predesign Of Pedestrian Suspension Bridge In Mountain District

Pedestrain suspension bridge structure has the concise deck. It consumes less steel products and can be easy builded and maintained. Its model is beautiful and the construction cost is low. The bridge structure can fully exert the characteristic of the high-strength steelwires which can bear greatly high tension. Such bridge has been more ideal structure system in tourist area and mountains where is poor in traffic. Guangyuan city stands at the junction of Longmen mountains, Micang mountains and low mountains of the Sichuan basin region. Its terrain is high in north and low in south, and big undulating also. To construct other bridge-types like continuous bridge or arched bridge not only difficult, but cost is also high for the special geological conditions in Guangyuan region. Relatively, It's more economical and feasible solution to choose the type of pedestrain suspension bridge relative to the same span of other bridge-types.Firstly, this article introduces the main contents during the pedestrain suspension bridge site selection, including social feasibility survey and technical survey. Secondly, this article discusses the main contents about pedestrain suspension bridge design, including building materials, design load, structural analysis and design, etc.; Finally, this article uses non-linear finite element theory, and unites the design methods of long-span suspension bridge and pedestrain suspension bridge. This article uses large-scale finite element software Ansys for structural static analysis, dynamic analysis and non-linear analysis. In the static anslysis, the article mainly discusses the internal force and deformation control, and finally proposed the impact of wind loads during structural design and setting structural measures such as wind cables to counteract the adverse effects of the force by wind load. Regarding the dynamic analysis, this article mainly discusses the earthquake resistant behavior of this bridge-type, useing response spectrum methods to analyses dynamic response of pedestrain suspension bridge, in order to resist the adverse effects of earthquakes on structures the type of tower which the pylon cross-bridge tilts inward and setting middle cross beam has been proposed. Finally, this article conductes the ultimate load bearing capacity anaylsis of pedestrain suspension bridge, throughout the analysis process, the towers has been in a state of elastic compression, the ultimate load bearing capacity safety factor of main cable is 1.08, which indicated that the capacityof the structure meets the requirements.The high aspiration is that this article can fully exert the merits of suspension foorbridge and develop the new domain of the development in pedestrain suspension bridge based on satitsfing security, applicability, economy and artistry.