支承方式对小半径鱼腹式连续曲线箱形梁桥受力性能的影响研究

由于构造方面的原因,曲线桥存在"弯-扭"耦合[1]作用,由于小半径鱼腹式连续曲线箱形梁桥曲率半径较小,其"弯-扭"耦合作用更加明显,为了讨论和验证支座的布置方式对小半径鱼腹式连续曲线箱形梁桥受力的影响。该文通过改变小半径鱼腹式连续曲线箱形梁桥支承方式,采用粱格法来建立有限元模型分析支承方式对小半径鱼腹式连续曲线箱梁梁桥纵向弯矩、扭矩和支座反力的影响。数据表明,双支座可以有效减小小半径鱼腹式连续曲线箱形梁桥的扭矩,可以使内、外侧支座的支反力趋于相等,使小半径鱼腹式梁桥受力更加合理,但是对纵向弯矩的影响较小。该文的结论对今后的设计工作有一定的指导意义。

Study of Influence of Supporting Mode on Mechanical Performance of Small-radius fish-bellied Continuous Curve Box Beam Bridge

The curve bridge occurs of the "bending and torsional" coupling action because of construction.Its "bending and torsional" coupling action is more obvious because of smaller curvature radius of small-radius fish-bellied continuous curve box beam bridge.In order to discuss and validate the influence of support layout mode on the mechanism of small-radius fish-bellied continuous box beam bridge,the article analyzes the influence of the supporting mode on the longitudinal bending moment,torsional moment and support reaction force of small-radius fish-bellied continuous curve box beam bridge by changing the supporting mode of small-radius fish-bellied continuous curve box beam bridge and using the beam grillage process to set up the finite element model.The data makes clear that the double-side support can efficiently decrease the torsional moment of small-radius fish-bellied continuous curve box beam bridge and can make the supporting reaction force of the inner and outer-side supports tend to equation and make the mechanism of small-radius fish-bellied beam bridge more reasonable,and but affect the longitudinal bending moment smaller.The conclusion of this article has some instructing meaning for the future design work.