Optimization of Design Parameters for Stiffened Steel Truss Bridge Based on Orthogonal Test
For the optimization design of Weihe Bridge,a stiffened steel truss bridge,a comprehensive optimization function is proposed based on orthogonal test method with consideration of mid span deflection of truss,mean efficiency coefficient for the members of truss mid span area and mean efficiency coefficient for the members of truss pier area.Then 18 plane truss finite element models of orthogonal tests are established,which choose stiffening range,height span ratio of stiffening chord and height of parallel chord truss as the key design parameters of stiffened steel truss bridge.Finally,optimal combination of design parameters for Weihe Bridge is selected.The results show that the sensitivity order of design parameters for stiffened steel truss bridge is:stiffening range height of parallel chord truss height to span ratio of stiffening chord.After optimizing,the stiffening form of Weihe Bridge remain unchanged and the optimal combination of design parameters is stiffening range 17 nodes,height to span ratio of stiffening chord 0.127 and height of parallel chord truss 14 meters.Compared with the original scheme,the optimized scheme of Weihe Bridge can reduce mid span deflection of truss by 17.6％,reduce mean efficiency coefficient for the members of truss mid span area by 7.1％,reduce mean efficiency coefficient for the members of truss pier area by 11.3％and reduce steel consumption of main span by 2.14％.The optimization method of design parameters,which is proposed in this paper based on orthogonal test,can provide a theoretical basis for the optimization design of stiffened steel truss bridge.
NETL
NSTL
万方数据
