基于监测应变,对胶州湾大桥的独塔自锚式悬索桥在不同施工阶段的塔侧支撑反力进行了识别。首先建立支撑结构的有限元模型,并根据主要监测点应变之间的协同关系,采用优化方法对有限元模型进行修正。然后,基于应变监测结果,针对钢箱梁吊装、吊杆张拉和临时支架拆除等各主要施工阶段,采用最小二乘法对塔侧支撑反力进行了识别,给出了历时1 a的动态反力值。所获得的识别结果表明,塔侧支撑结构的应变监测子系统较好地发挥了其应有的功能。基于应变监测的识别方法,能够较好地反映不同施工阶段的实际工况,可以对相关结构做出有效的识别和评价。在反力识别的基础上,结合吊杆、钢箱梁等其他部位的监测数据,可进一步实现对钢箱梁、吊杆的受力和工作状态的分析和评价。 Based on the monitoring strain, the tower-side supporting reaction force at different construction stages of the single tower self-anchored suspension bridge of Jiaozhou Bay Bridge was identified. First, the finite element model of the supporting structure is established. Based on the synergetic relationship between the strain of the main monitoring points, the optimization method is used to correct the finite element model. Then, based on the results of strain monitoring, the reaction force of the tower side support was identified by using the least squares method for the main construction stages such as hoisting of steel box girder, suspension bar tensioning and temporary support disassembly. The dynamic response Force value. The obtained identification results show that the strain monitoring subsystem on the tower side support structure has exerted its proper function well. Based on the strain monitoring method, it can reflect the actual working conditions of different construction stages well, and can effectively identify and evaluate the related structures. Based on the reaction force identification, combined with the monitoring data of boom, steel box girder and other parts, the force and working status of steel box girder and boom can be further analyzed and evaluated.