PDF《小矢跨比上承式钢提篮拱桥动力及稳定性分析》

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9 年3月第35 卷第2期沈阳建筑大学学报(自然科学版)Journal of Shenyang Jianzhu University (Natural Science) Mar.

2019 Vol. 35? No.

2 收稿日期:2018 -

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08 基金项目:国家自然科学基金项目(51278312)?辽宁省自然科学基金项目(201602602) 作者简介:赵唯坚(1958―)?男?教授?博士?主要从事混凝土结构及组合结构方面研究. 文章编号:2095 - 1922(2019)02 -

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09 doi:10.

11717 / j. issn:2095 - 1922. 2019. 02.

01 小矢跨比上承式钢提篮拱桥动力及稳定性分析 赵唯坚1 ?刘欢2 ?王占飞2 ?高强3 (1. 浙江大学建筑工程学院?浙江 杭州 310000?2. 沈阳建筑大学交通工程学院? 辽宁 沈阳 110168?3. 沈阳建筑大学建筑设计研究院?辽宁 沈阳 110168) 摘要目的 研究小矢跨比上承式钢提篮拱桥的动力特性、稳定性能影响因素及其 变化趋势. 方法 以某上承式钢提篮拱桥为背景?采用有限元软件 ABAQUS 建立空间 有限元模型?模型中对拱肋、主梁、边墩及立柱均采用梁单元建模?桥面板采用壳单元 建模. 通过改变模型的矢跨比和内倾角?分析其对拱桥自振周期、振型、屈曲稳定系数 的影响. 结果 矢跨比对拱桥自振周期及稳定系数影响较大?随着矢跨比减小?拱桥面 外一阶稳定系数先增大后减小?内倾角对此类拱桥的一阶、二阶自振周期和面外稳定 系数影响较大?当内倾角 α <

4°?一阶振动的周期随着内倾角 α 的增加而减小?当内 倾角 α >

4°?随着内倾角 α 的增加?二阶振动的周期逐渐减小?增大内倾角面外稳定 性提高. 结论 得到的不同内倾角和矢跨比下拱桥动力特性和稳定性的变化规律?可 为此类拱桥的设计和工程实践提供参考和借鉴. 关键词 矢跨比?上承式钢拱桥?稳定系数?内倾角?失稳模态 中图分类号 TU997 文献标志码 A Dynamic Characteristic and Stability Analysis of Small Rise~Span Ratio Steel Deck~Type Basket Arch Bridge ZHAO Weijian1 ?LIU Huan2 ?WANG Zhanfei2 ?GAO Qiang3 (1. College of Civil Engineering and Architecture? Zhejiang University? Hangzhou? China?310000?2. School of Transportation Engineering?Shenyang Jianzhu University?Shenyang?China?110168?3. Architectural Design and Re~ search Institute?Shenyang Jianzhu University?Shenyang?China?110168) Abstract:In order to study the influence factors and the changing trend of the dynamic characteris~ tics and the stability of the small rise~span ratio steel deck~type basket arch bridge?a 3~D FE model was established based on a similar steel arch bridge by finite element software ABAQUS. In the model?the arch rib?girder?side pier and column are modeled by beam element?and the deck is modeled by shell element. By changing the rise~span ratio and inner lean angle of the model?the influence of its naturally period?vibration mode and buckling stability coefficient of the arch bridge is studied. The results show that?the natural period and the stability coefficient of the arch bridge

194 沈阳建筑大学学报(自然科学版)第35 卷are largely influenced by the rise~span ratio. With the decrease of the rise~span ratio?the first order stability coefficient of the arch bridge increases first and then decreases. The inner lean angle of the bridge has a greater influence on the first and second order of natural vibration period. When the angle of alpha is less than 4°?the first~order natural vibration period decreases with the increase of alpha?and when the angle of alpha is more than 4°?along with the increase of the angle alpha?the period of the second~order natural vibration period decreases. By increasing the arch rib in the lean angle?the lateral stability performance is significantly improved. The dynamic characteristics and stability of arch bridges with different inner~lean angle and rise~span ratio is obtained?which has certain reference value for the design and engineering practice of such arch bridges. Key words:rise~span ratio?deck~type steel arch bridge?stability coefficient?inner lean angle?buck~ ling mode 上承式钢拱桥是山区常见的一种桥型? 由于钢拱桥具有结构轻盈?跨越能力大的优 点?很适合在山区等地质情况较复杂的地区 修建[1] . 而矢跨比的选择在拱桥尤其是大跨 度钢拱桥中极为重要?它不但影响拱桥受力 的合理性?如拱桥的稳定性、动力特性?还影 响拱桥的构造形式、施工方法的选择以及与 周围环境的协调性[2] . 目前?已建和在建的 钢拱桥中较为常用的矢跨比为 0?