桥型布置对独柱墩曲线梁桥抗倾覆性能的影响  

Influence of Structure Arrangement on Anti-overturn Performance of Curved Beam Bridge with Single-column Piers

作　　者：鲁圣弟 熊文[2] 丁旭东 叶见曙[2] 韦国志 

机构地区：[1]安徽省交通控股集团有限公司,安徽合肥230088 [2]东南大学交通学院,江苏南京210096

出　　处：《公路交通科技》2017年第5期95-101,共7页Journal of Highway and Transportation Research and Development

基　　金：安徽省交通运输厅科技项目(AHGS 2014-18);中央高校基本科研业务费专项资金项目(2242016R30023)

摘　　要：以三跨连续独柱墩曲线梁桥作为基本结构,针对不同桥型布置形式建立有限元模型,利用非线性分析与接触理论考察倾覆过程中结构位移、转角及支座反力的时程变化规律。进而计算抗倾覆稳定安全系数,分析不同桥型布置下的独柱墩梁桥抗倾覆能力及倾覆力学特征,改变桥型布置以对独柱墩倾覆力学行为进行参数分析,并将规范法计算结果与有限元法计算结果进行对比。数值仿真表明:随偏载不断增大,边墩内侧支座反力首先减小直至脱空;反力重新分配后,边墩外侧支座反力增速减缓,中墩单支座反力持续增大,最终达到极限状态。通过参数分析可进一步看出:不同桥型布置形式对这一倾覆过程影响明显,边中跨比越小的独柱墩梁桥,其抗倾覆安全性能越低;如果同时曲线半径较大,则采用规范方法验算时会大大高估其抗倾覆能力,从而降低结构设计的安全性。Based on a three-span continuous curved beam bridge with single-column piers,the finite element models of different structure arrangements are built. The change laws of deformation,rotation,and support reaction during the entire process of bridge overturn are investigated using nonlinear analysis and contact theory. The safety factor for describing the anti-overturn ability is further calculated,the anti-overturn ability and the mechanical characteristics of overturning of the bridge with single-column piers are analysed. Varying the structure arrangement,the parametric study for the mechanical characteristics of overturning of singlecolumn piers is conducted,and the calculation result from finite element method is compared to that based on the existing design standard. The numerical simulation shows that（ 1） along with increasing unbalanced loading,the inner support reaction at side pier would decrease until the bearing is disengaged;（ 2） after reaction re-distribution,the increasing of the outer support reaction at side pier becomes slow,and the support reaction at the single support of middle pier keeps increasing until reaches its limit condition. Based on the parametric study,it is also found that（ 1） different structure arrangements could highly influence the overturn process,the smaller the ratio of side-span to middle-span,the weaker the anti-overturn ability;（ 2）if meanwhile with a higher curve,the result based on the existing design standard could highly overestimate the anti-overturn ability,and thus reduce the safety of structure design.

关 键 词：桥梁工程 独柱墩 参数分析 抗倾覆 曲线半径 边中跨比 安全系数 

分 类 号：U442[建筑科学—桥梁与隧道工程]