【摘要】 基于ANSYS平台,建立3至6塔主跨跨径为1 400m的多塔悬索桥有限元计算模型,研究索塔数对多塔悬索桥静力特性、动力特性和静力稳定性的影响特点,探讨其对多塔悬索桥活载挠度、塔顶纵向位移及主缆抗滑移性能等关键力学问题的影响特征.结果表明:索塔数由3塔增至6塔时,塔根弯矩最大增大240%,主梁弯矩最大增大18%,主缆抗滑移系数最大减小11%,中间塔顶位移减小2%,一阶弹性稳定系数最大下降6.8%,颤振稳定性指数最大增加8.5%;主梁边跨竖向挠度比中间跨小40%左右,且中间跨挠度相近;索塔数对中间索塔受力影响显著.更多还原

【Abstract】 Finite element computation models were established on the basis of ANSYS platform for multitower suspension bridges with 3-to 6-tower and 1 400 m main span.The characteristics of influence of tower quantity on static property,dynamic property and static stability of multi-tower bridge was investigated and the characteristics of influence of tower quantity on the key mechanic problems,such as live load deflection of the bridge,longitudinal displacement of towner top,anti-slide performance of main cable were explored.The analysis result showed that,when the tower quantity increased from 3to 6,the bend moment of tower bottom would increase by 240% at most,the bend moment of beam would increase 18% at most,the anti-slide factor of main cable would decrease 11% at most,the longitudinal displacement of middle tower would decrease 2%,first-order instability factor would decrease by 6.8% at most,flutter stability index would increase by 8.5% at most.The vertical deflection of main beams of middle spans would be approximately equal to each other and larger than that of side spans by about 40%.Tower quantity would significant effect on the force on the middle towers.更多还原