Construction Process Monitoring Methods And Practice On Cangxi Jialingjiang Super Major Prestressed Concrete Continuous Rigid Frame Bridge

Prestressed concrete continuous rigid frame bridge springs up everywhere benefiting from its superior qualities such as outstanding span capacity, good structure rigidity and construction methods. Meanwhile, it's worth paying more attention on construction monitoring methods, for the fact that disturbances existed in such system because of the cantilever construction as well as the uncertainty expandable system. Based on Jialingjiang continuous rigid frame bridge, this thesis systermatically sumed up the extent construction monitoring methods and studied both the construction monitoring methods and the construction results in such project.The paper begins with summerizing design features related to continuous rigid frame bridge and current situation of construction monitoring methods home and abroad. The necessity of accuracy analysis and parameter identification was analyzed, centering on the relations of ideal design state, practical results and optimal achieved condition.Then, the article generalized and compared the staple analytical measures in continuous rigid frame bridge, regarding orderly-erecting analysis method as an optimal way in such construction monitoring. Midas/civil was applied to do the FEM spatical analysis of structure, in which simulating procedures were also provided. How do selfload, modulus, prestress and systematic tempreture affect structure behavior both in largest cantilever state and finished stage was discussed separately, which come to the conclusion that selfload, prestress and systematic tempreture are the main design parameters; modulus is less significant by contrast. Meanwhile, both the strength and the stability of the triangular hanging scaffold were calculated in the paper. The results of load test on scaffold were also discussed.At last, this thesis summed up the practical monitoring methods of elevation, stress and stability in Jialingjiang continuous rigid frame bridge. The parameter estimation in this bridge is descripted by means of Least Square Method.