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大跨度预应力混凝土V形刚构桥桥梁线形对桥梁受力影响很大,而结构参数的取值对预拱度的预测影响较大,在施工监控过程中需根据施工现场监测数据进行结构参数调整。首次提出基于响应面法的针对大跨混凝土V形刚构桥进行施工监控的方法,该方法包括试验设计、有限元分析、响应面函数拟合和结构参数调整。并以实际工程为例,采用Box2Behnken试验设计方法,选择影响成桥线形的主要结构参数作为自变量,关键截面的挠度值为因变量,利用显式响应面函数拟合结构静力响应值与结构参数之间复杂的隐式关系。然后根据施工过程中的实测挠度数据进行结构参数识别,再进行后期的预拱度预测,实现前期预测和后期调整相结合,工程实例表明该方法能够在施工控制过程中有效地进行参数识别,得到大跨V形混凝土刚构桥的理想线形。
Long-span prestressed concrete V-shaped rigid-frame bridge has a great influence on the stress of the bridge, while the value of structural parameters has a great influence on the prediction of pre-camber. During the construction monitoring process, the structural parameters Adjustment. The method of construction monitoring based on response surface method for long-span concrete V-shaped rigid frame bridge is proposed for the first time. The method includes experimental design, finite element analysis, response surface function fitting and structural parameter adjustment. Taking practical engineering as an example, Box2Behnken experimental design method was used to select the main structural parameters that affect the alignment of the bridge as independent variables. The deflection of the critical section was taken as the dependent variable. The explicit response surface function was used to fit the static response and structure Complex implicit relations between parameters. Then, the structural parameters are identified according to the measured deflection data in the construction process, and then the prediction of the pre-camber is carried out in the later period to realize the combination of the prediction of the early stage and the later adjustment. The engineering examples show that the method can effectively identify the parameters during the construction control and obtain Ideal Linear Shape of Long - span V - shaped Concrete Rigid Frame Bridge.