基于实测数据的高墩大跨混凝土梁桥高精度有限元模拟方法  

High-Precision Finite Element Simulation Method for High Pier and Long Span Concrete Girder Bridge based on Field Test Data

作　　者：高鹏[1] 孙宁[1] GAO Peng;SUN Ning(CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075

出　　处：《公路》2020年第5期75-82,共8页Highway

基　　金：中央高校基本科研业务费专项资金项目,项目编号300102218506。

摘　　要：高墩大跨混凝土梁桥在我国沟壑峡谷地区应用较为广泛。针对这种桥梁混凝土结构施工难度较大且施工周期较长的特点,提出了一种适用于该桥型成桥阶段的力学性能分析的高精度有限元建模方法。该方法首先建立初始有限元模型,然后根据混凝土桥梁的实际施工情况以及荷载试验实测数据对该有限元模型中的结构参数进行修正,获取桥梁在运营阶段荷载作用下的准确的力学响应模型。以一座四跨混凝土连续刚构箱梁桥为依托工程建立了有限元模型,并根据其实际施工误差和结构特点确定了4个结构参数作为待修正参数,采用响应面法根据桥梁实桥加载数据对其结构参数进行了修正。结果表明,采用修正后的结构参数建立的有限元模型与实桥加载数据吻合良好,有限元模型计算精度得到了显著提高,可真实反映桥梁实际结构的受力状态。该方法可为桥梁结构运营期间的健康监测、状态评估、损伤检测提供可靠的分析手段。The high pier and long span concrete girder bridge is widely used in the gully gorge area of China.Aiming at the difficulty of construction of such bridge concrete structure and the long construction period,a high precision finite element modeling method is proposed which is suitable for the mechanical performance analysis of the bridge.The initial finite element models are established firstly,and then structural parameters are updated according to the actual construction conditions of the bridge and the measured data of the load test,and the reasonable model of the bridge in operational stage is obtained.A finite element model is established based on a practical engineering of four-span concrete continuous rigid bridge.According to its actual construction errors and structural characteristics,four structural parameters are determined to be corrected,and the response surface method is applied to update the model.The results shown that the finite element models established by the modified structural parameters are in good agreement with the real bridge test data.The precision of the finite element model is significantly improved,which can truly reflect the stress state of the actual bridge structure.The method can provide a reliable analysis method of health monitoring,state assessment and damage detection during the operational stage of the bridge structures.

关 键 词：大跨混凝土梁桥 高墩 高精度 有限元模型 研究 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]