基于梁格法的单箱多室箱梁桥偏载系数研究  

Research on Eccentric Load Coefficient of Single Box and Multi Cell Box Girder Bridge Based on Grillage Method

作　　者：胡赛鸿 申抚兵 韩汤益 HU Saihong;SHEN Fubing;HAN Tangyi(Changsha Urban Construction Investment Co.,Ltd.,Changsha 410000,China;Municipal Engineering Northwest Design and Research Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]长沙市城市建设投资有限公司,湖南长沙410000 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《河南科技》2024年第7期70-74,共5页Henan Science and Technology

基　　金：结构抗风与振动控制湖南省重点实验室“钢-UHPC组合桥面板横向抗弯性能与设计研究”(E22340)。

摘　　要：【目的】为了探究单箱多室宽桥面箱梁桥的偏载效应,明确相关影响因素对偏载系数的影响规律,以湖南省长沙市港子河大桥为例开展数值仿真与对比研究。【方法】基于商用有限元软件Midas Civil构建桥梁的有限元梁格法模型,研究单箱多室箱梁桥偏载效应,分析偏心距等影响因素对偏载系数的影响规律。【结果】研究表明,正应力偏载系数最大值为1.25,出现在跨中截面,剪应力偏载系数普遍在1.5左右,经验系数法对于类似宽桥面单箱多室箱梁桥偏载系数的估计严重偏低。活载偏心距对偏载系数有较大影响,且偏心距越大偏载系数越大,两者近似线性相关。【结论】梁格法能够较为准确地模拟单箱多室箱梁结构偏载效应,尤其是现代城市中宽桥面单箱多室箱梁桥,而经验系数法对类似桥梁并不适用,预测结果严重偏低,增大了箱梁桥开裂的风险。[Purposes]In order to explore the eccentric load effect of Box girder bridge with single box and multi room wide deck and clarify the influence law of relevant influencing factors on the eccentric load coefficient,numerical simulation and comparative study were carried out with the Gangzihe Bridge in Changsha,Hunan Province as an example.[Methods]Based on the commercial finite element software Midas Civil,the finite element grillage model of the corresponding bridge is constructed,and the eccentric load effect of single box multi cell Box girder bridge is studied.[Findings]Research shows the maximum value of the normal stress eccentric load coefficient is 1.25,which appears in the mid span section.The Shear stress eccentric load coefficient is generally about 1.5.The empirical coefficient method has seriously underestimated the eccentric load coefficient of similar wide deck single box and multi cell Box girder bridge.The eccentricity of live load has a significant impact on the eccentricity coefficient,and the larger the eccentricity,the greater the eccentricity coefficient.The two are approximately linearly correlated.[Conclusions]The beam grid method can accurately simulate the spatial stress situation of a single box and multi cell box girder structure under eccentric load conditions.The eccentric load effect of modern urban medium wide deck single box and multi cell Box girder bridge is obvious,and the empirical coefficient is not applicable to similar bridges.

关 键 词：桥梁工程 单箱多室箱梁 偏载效应 梁格法 经验系数法 

分 类 号：U411[交通运输工程—道路与铁道工程]