Analysis of Force of Single Suspension Point and No-wind Braced Beam-Arch Combination Bridges
The single suspension point and no-wind braced beam-arch combination bridge is novel.Compared with conventional beam-arch combination system bridges,there are force differences and prominent problem of out of plane stability of arch ribs.The influence of four structural design parameters,namely the rise span ratio,arch axis,arch beam stiffness ratio and boom topping angle on the internal force and out of plane stability of arch ribs under constant load are studied.It is found that a large rise span ratio can reduce the axial force of the arch rib,improve out of plane stability,effectively reduce the bending moment at the arch foot,but increase the bending moment at the arch crown;The straight arch axis is closer to the pressure line,and the arch ribs are subjected to axial compression,but the out of plane buckling coefficient is reduced;The greater the stiffness ratio of the arch beam,the stronger the load bearing capacity of the arch crown,which can reduce the bending moment at the arch foot and improve the sta-bility of the arch ribs;A larger boom topping angel can improve the stress and out of plane stability of the arch ribs.Finally,suggestions are given for the selection of various parameters and reference for similar engineering designs.
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