悬臂施工连续箱梁桥结构参数敏感性分析

以嫩江桥的悬臂施工为例，对预应力混凝土连续箱梁桥在施工监控过程中设计参数的敏感性进行了分析。选取容重误差、预应力损失、混凝土收缩徐变及温度变化等对桥梁线形和内力有影响的因素为研究对象，并采用桥梁有限元分析软件——桥梁博士建立仿真模型，对各影响因素水平变化影响下的结构响应进行了分析，认为主梁自重和混凝土收缩徐变为主要参数，预应力变化和年温度变化为次要参数。

SENSITIVITY ANALYSIS OF CANTILEVER CONSTRUCTION OF CONTINUOUS BOX GIRDER BRIDGE

In this paper, taking the continuous box girder cantilever bridge construction as an exam- pie, in the construction of monitoring the sensitivity of the design parameters were analyzed. The reaserch objects are main beam weight, elastic modulus of concrete, concrete shrinkage and creep and tempera- ture changes that affect the internal forces on the bridge and the design parameters. Finite element analy- sis software of bridge-Doctor Bridge is adopted to establish a simulation model, to carry on the structural response analysis, to prestressed concrete continuous box bridge construction. We make a conclusion that main beam weight and concretes＂ shrinkage and creep are the main parameters. Moreover, prestressed and annual temperature are the secondary parameters.