Analysis on Design Parameters of Multi-span Beam Arch Composite Continuous Rigid-frame Bridge
In order to study the influence of key design parameters on the stress and deflection of critical sections in a multi-span beam arch continuous rigid-frame bridge,a comparative study of parameters was conducted using finite element numerical simulation on an under-construction beam arch continuous rigid-frame bridge.Firstly,the influence of the beam-arch stiffness ratio,main beam pier height-span ratio,and pier anti-thrust stiffness ratio on the structure was analyzed and was compared with a rigid frame bridge of the same span,obtaining the recommended range of values for the key design parameters.Secondly,orthogonal experiments were performed on the design parameters to obtain the optimal combination of orthogonal experimental results under different target functions.The results show that:1)Different beam-arch stiffness ratios significantly affect the stress of the steel box arch ribs;2)As the height-span ratio increases,the difference in deflection produced by concrete creep in the main beams of the two different structural systems also gradually increases;3)The deflection trends produced by changes in the pier anti-thrust stiffness ratio have significant differences between the two structural systems.4)According to the results of the orthogonal experiment,the optimal values of the design parameters should reduce the beam-arch stiffness ratio from 58/1 to 45/1 and the main beam pier height-span ratio from 9.5/170 to 8.5/170.
万方数据
维普
