Analysis Of Parameter Sensitivity In Construction Control Of Long-span Continuous Rigid Frame Bridge

The construction control of Large-span continuous rigid frame bridge with concrete cast-in-place cantilever include alignment control and stress control. in the procedure of construction control, for ensuring bridge's stress and alignment meet the needs of in the stage of construction and service stage ,it must sufficiently consider the influence of all kinds of factor , using calculation software for modeling, using All kinds of observations,to understander the process of construction of the true state of the bridge,then timely feedback to the construction of the calculation. For making cantilever construction of safe and effective and making the bridge's alignment to meet the design requirements, it must applicable adjust the main control parameters to. Therefore, it is necessary to control the impact of various factors parameter sensitivity analysis, so as to the actual construction process will produce its desired effects.This paper, based on Weijiazhou large continuous rigid frame bridge, use Midas/Civil to build up the finite element model.Forward-analysis method is used to calculate. The Weijiazhou-bridge construction is under monitoring. The paper analysis the displacement and stress state of the various stages for the continuous rigid frame bridge, analysis the various parameters of the sensitivity analysis in the construction process, identify the main design parameters impact of bridge construction status, and use the least-squares method to estimate the impact of the main bridge construction Parameters. By analyzing the result: In the construction process, the main factor impact of the girder's displacement and stress is the temperature gradient,concrete elastic modulus error,over pouring of concrete,and the concrete creep error. Their play a important part to the girder's displacement and stress. And we should pay attention to the current of the concrete creep error influence to the girder's displacement under different levels of stress; prestressed concrete pouring error influence to the girder's displacement and stress; pipeline friction error, heating in system and local pipeline deviation coefficient errors play a limited impact on the girder's displacement and the stress, can be ignored.