索塔数对多塔悬索桥力学性能的影响
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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.
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.
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.
引文
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[2]杨进.多塔多跨悬索桥应用于海峡长桥建设的技术可行性与技术优势[J].桥梁建设,2009(2):36-39.
[3]杨进.中国大陆创建多塔大跨度悬索桥的工程进展[J].桥梁建设,2009(6):39-41.
[4]郑凯锋,栗怀广,胥润东.连续超大跨悬索桥的刚度特征[J].西南交通大学学报,2009,44(3):342-346.
[5]陈策,钟建驰.三塔悬索桥垂跨比变化对结构静动力特性的影响[J].桥梁建设,2008(6):12-14.
[6]焦常科,李爱群,王浩.3塔悬索桥动力特征参数分析[J].公路交通科技,2010,27(4):51-55.
[7]邹科官,王浩,梁书亭.中央扣对三塔悬索桥动力特性的影响[J].建筑科学与工程学报,2009,26(4):49-53.
[8]焦常科,李爱群.非弹性连接对三塔悬索桥地震响应的影响[J].中国公路学报,2013,26(1):98-105.
[9]邓育林,雷凡,何雄君.纵向地震作用下大跨三塔悬索桥伸缩缝处双边碰撞效应研究[J].振动与冲击,2013,32(12):126-130.
[10]张新军,陈兰,赵孝平.三塔悬索桥的缆索体系及其抗风稳定性[J].浙江工业大学学报,2010,38(4):437-441.
[11]FORSBERG T.Multi-span suspension bridges[J].International Journal of Steel Structure,2001,1(1):63-73.
[12]OSAMU Yoshida,MOTOI Okuda,TAKEO Moriya.Structural characteristics and applicability of four-span suspension bridge[J].Journal of Bridge Engineering,2004,9(5):453-463.
[13]杨进.泰州长江公路大桥主桥三塔悬索桥方案设计的技术理念[J].桥梁建设,2007(3):33-35.
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