Research on Reasonable Stiffness Ratio of Arch Beam of Large-Span Railway Bridge Structure with Continuous Beam Arch Composite
The long-span continuous beam arch composite bridge has good mechanical performance and economic effect.Among them,the arch beam stiffness ratio is an important design parameter of this type of bridge,but the previous research on the arch beam stiffness ratio is not deep and comprehensive.To understand the influence of arch beam stiffness ratio on long-span railway continuous beam arch composite bridge,taking Fuzhou Wulong River Bridge under construction as an example,the influence of arch beam stiffness ratio on the structural stress characteristics,beam arch load sharing and quantities of the bridge was studied.The results show that the stiffness ratio of arch beam has a significant effect on the axial force of arch rib and the bending moment of main beam,arch foot and arch crown.When the stiffness ratio is less than 1.73 or more than 1.44,the maximum increase of bending moment is close to 50%,and the increase of arch beam stiffness ratio is more conducive to the performance of arch ribs.However,when the arch beam stiffness ratio is greater than or equal to 1.44,the increase of arch rib stiffness has limited improvement on the overall mechanical performance.When the arch beam stiffness ratio is less than or equal to 1.73,the live load of the main beam increases too fast,which increases the risk of local damage or overall collapse of the structure.Considering comprehensively,the reasonable value range of stiffness ratio of arch beam of this type of bridge should be 1.44～1.73.To obtain better economic effect in engineering,the stiffness of main beam or arch rib can be appropriately reduced.
NETL
NSTL
万方数据
维普
