Construction Control For Long-span PC Continuous Rigid Frame Bridges And Temperature Effect Analysis

With the development of bridge engineering construction and the improvement of prestressed technology, more and more large-span prestressed concrete continuous rigid frame bridge are built. To keep the accordance of alignment of built bridges with the expectation and to insure the safety of bridges in construction, the construction control is paid more and more attention. In the dissertation, by engineering practice assisted with theory analysis, on the basic of the construction of Tianluo Bridge of Wen Zhou-Fu Zhou Railway Passenger Dedicated Line, the application of "Adaptive Control" in construction control of long span prestressed concrete continuous rigid frame bridge is discussed. At the same time, the key parameters of construction process of an over-line continuous cantilever beam bridge are analyzed through the finite element software .Through the process of the analysis, the effect of the parameters to the construct is proved .According to the analysis of parameters, we can find the basis for adjusting the parameters. In the dissertation, in order to receive the temperature range and the chance of closure for large span bridges, the influence of sunlight is discussed.Main research works of this dissertation are included below:1) Make a review of the development and study about Large-span PC continuous rigid frame bridges in China and abroad and method of construction control.2) The theory and system of construction control are given a review and the method of deflection analysis and adjustment is raised based on the "Adaptive Control" theory.3) On the basic of the construction of Tianluo Bridge of Wen Zhou-Fu Zhou Railway Passenger Dedicated Line, with the FEM, factors which influence the alignment control and stresses of PC cantilever bridges, such as density of concrete, elastic modulus of concrete, temperature, are analyzed.4) Introduce the implementation of the Tianluo Bridge's construction control. In order to obtain the changes of stress,concrete strain meters are buried in the beam;at the same time , measuring point of elevation are buried on the beam to obtain the change values of elevation.5) On the basic of the construction of Tianluo Bridge, in order to find the temperature range and the chance of closure for large span bridges, sunshine temperature difference and annual temperature difference are discussed.