混凝土桥梁应力监测中温度影响的剔除方法

Elimination Method of Temperature Influence in Stress Measurement of Concrete Bridge

混凝土实测应变由温度应变、应力应变、收缩徐变应变等组成,从中获取反映结构受力的应力应变对桥梁受力评价和施工控制具有重要意义.通过分析混凝土应变的组成,基于混凝土应变和温度的同步连续监测数据,提出了以温度应变为主的非应力应变剔除方法,使监测应变能更精确地反映结构的真实受力状态,并以宁波市轨道交通4号线上跨杭深、萧甬铁路工程跨铁路节点桥为例介绍了该方法,从而为结构应力分析和施工控制提供了依据.

The measured strain of concrete is composed of temperature strain,stress strain,shrinkage strain and creep strain,etc.Itis of great significance to obtain the stress and strain which reflect the stress of the structure for the evaluation and construction control of the bridge By analyzing the composition of concrete strain,based on the synchronous continuous monitoring data of concrete strain and temperature,a non-stress strain elimination method mainly by temperature strain is proposed,which makes the strain monitoring more accurately reflect the real stress state of structure.Taking Ningbo Metro Line 4 Node Overpass of Hangzhou-Shenzhen Railway and Xiaoshan-Ningbo Railway as an example this method is introduced to provide the basis for the stress analysis and construction control of the structure.