基于模型修正理论的装配式梁桥载荷横向分布计算  

Calculation of Load Transverse Distribution of Fabricated Beam Bridge Based on Model Modification Theory

作　　者：李院军 LI Yuanjun(The Fourth Design Institute,Guangdong Transportation Planning and Design Institute Group Co.,Ltd.,Guangzhou 510507,China)

机构地区：[1]广东省交通规划设计研究院集团股份有限公司第四设计院,广东广州510507

出　　处：《沈阳大学学报（自然科学版）》2022年第2期146-152,168,共8页Journal of Shenyang University：Natural Science

基　　金：陕西省交通运输厅科技项目(18-19T)。

摘　　要：为了计算装配式梁桥发生主梁和横向联系构件损伤情况下的载荷横向分布系数,在比拟正交异性板法的基础上,根据损伤模型的特点,选择主梁单宽抗弯刚度、抗扭刚度和横桥向的单宽抗弯刚度、抗扭刚度作为待修正参数,再以实测和理论挠度值构造目标函数,并基于L-M法进行多目标优化,得到修正后的载荷横向分布系数。为了验证修正模型的准确性,以一座在役15 a的装配式小箱梁桥为例,进行了载荷试验。结果表明:模型修正后的挠度计算值与实测值相比误差较小,模型修正后的主梁载荷横向分布系数与实测值较为吻合,最大误差仅为-3.8%。In order to calculate the transverse distribution coefficient of load in the case of damage of main girder and transverse connecting member of fabricated girder bridge,based on the comparison of orthotropic plate method and according to the characteristics of damage model,the single width flexural rigidity,torsional rigidity of main girder and the single width flexural rigidity and torsional rigidity of transverse bridge direction were selected as the parameters to be modified,and then the objective function was constructed with the measured and theoretical deflection values.Based on the L-M method,the multi-objective optimization was carried out,and the modified lateral load distribution coefficient was obtained.In order to verify the accuracy of the modified model,a small box girder bridge in service for 15 years was taken as an example to carry out load test.The results show that the error between the calculated value of deflection and the measured value is smaller after the model is modified,and the transverse distribution coefficient of the girder load after the model is modified is more consistent with the measured value,and the maximum error is only-3.8%.

关 键 词：桥梁工程 装配式梁桥 载荷横向分布系数 模型修正理论 比拟正交异性板法 

分 类 号：TU448.21[建筑科学—岩土工程]