Analysis on Influence of Side-to-mid-span Ratio of Continuous Beam-Arch Composite Bridge
The main beam and arch ribs of a continuous beam-arch composite bridge are synergistically stressed with large overall stiffness and strong spanning capacity.Taking a three-span continuous beam-arch composite bridge as the engineering background,the effect of the side-to-mid-span ratio on the internal force,deformation,support reaction force,natural vibration frequency and stability of the bridge is analyzed.It is found that the internal forces and deformation of the main beam and arch ribs,and the support reaction force at the side supporting point of the main beam increase with the increase of the side-to-mid-span ratio,and the negative reaction force appears at the side supporting point when the side-to-mid-span ratio is 0.400 under the constant load.The natural vibration frequency of the bridge decreases with the increase of the side-to-mid-span ratio.The stability coefficient of the bridge during the construction stage decreases with the increase of the side-to-mid-span ratio.The stability coefficient of the finished bridge state increases with the increase side-to-mid-span ratio,but the rate of change of the stability coefficient is small.The reasonable side-to-mid-span ratio of continuous beam-arch com-posite bridge is recommended to be between 0.425 and 0.500.
NETL
NSTL
万方数据
维普
