Bridge Forming Analysis And Structure Response Research For Small Span Landscape Suspension Bridge

Design of small-span landscape suspension bridge should ensure aesthetics,structural safety and dynamics performance are met.Main cables geometric alignment plays a structural and aesthetic role in the bridge.It’s of importance to design the main cable alignment under actual loading of the bridge to simulate the actual response.One should ensure structural safety by checking on ultimate capacity of the suspension and dynamic performance is consistent in the design.It is of great importance to carry out and adopt a multi-operating loading test conditions to guarantee the structure safety and performance of the suspension bridge.With the actual suspension bridge requirements,this dissertation conducted and observed the following;(1)The parabolic method,the segment catenary method and the finite element method were adopted to obtain the nodal coordinates of the main cable of the suspension bridge.By comparing the calculation results of the three methods,we conclude that the segment catenary method is accurate for the small-span suspension bridge design.A computer program for the main cable alignment of suspension bridge was developed.(2)The bridge surface is divided into three equal-area and five groups of different load conditions was set up and loading tests were conducted on the real bridge.The displacement response of various observation points under different working conditions were measured and recorded.After the test,upon bridge inspection we observed all components were in good condition without failure.The rationale of design and reliable construction of the different components were verified.(3)In addition to the real bridge load experiment,the finite element software(SAP2000)was used to establish the three-dimensional finite element model of the landscape suspension bridge.The SAP2000 loading was carried out under the same load conditions as the loading test,and the both results were compared.The FEM results tally well with the observed bridge test results.(4)By adopting finite element method,the dissertation shows that the inclination of cable enhances the transverse stiffness and the compression spring reduces the vibration period of the corresponding direction.The study provides more reference on cable bridge design and other bridges with similar features.