The Research On Closure Jacking Force And Construction Control In Long-span Low Pier Continuous Rigid Frame Bridge

The construction technology research for high pier continuous rigid frame bridge is more than low pier continuous rigid frame bridge in the past. Because of the low pier,it is difficult to adapt to the longitudinal deformation caused by the factors such as temperature,ereep and shrinkage of concrete.So it is need special structure design and construction measures.Such as loading jacking force before closure construction and the design of the pier.Reasonable derermine jacking force for short pier continuous rigid frame bridge is very important.The main contents include there aspects in this paper:1、 Taking Zuojiang bridge as an example,based on the horizontal displacement control principle of die pier.reasonable determine the closure jacking force of the main girder.In the end,we analysis and compare the stressing state of the structure.which based on loading jacking force and not loading jacking force.2、 Based on the finite element simulative analysis and field measurement.finished the work of construction control for Zuojiang bridge and get the actual results.3、 Do the sensitivity analysis to the influence of bridge structure for different parameters, get the impact of the vertical deflection of the bridge during construction for different parameters. According to influence degree of the parameters on control is different,we can determine the sensitive parameters and the non-sensitive parameters.