|
With the rapid development of transport infrastructure , the construction of the bridge builders in China and planned many large span large complex bridge difficult . Its large span beam arch combination bridge foundation adaptability , reasonable force structure , economy, cost and convenient construction , attractive appearance and unique advantage has been widely used . In order to ensure the safety of its construction to achieve the into bridge design goals , and improve the quality of construction , construction must be carried out in the construction process control . Yichang Yangtze River Railway Bridge prestressed concrete continuous rigid frame and flexible arch of steel pipe concrete composite bridge structure . Bridge as an engineering background , dedicated space finite element software MIDAS / CIVIL its whole construction process simulation analysis , considering concrete creep and shrinkage , reinforced prestressed loss , changes in boundary conditions and other factors in the system conversion process by summary of the variation of the stress and deflection of the construction stage , ready to work for the bridge stress control . And the use of modern control theory , parameter identification method is applied to the Yichang Yangtze River Railway Bridge construction stress control , and construction monitoring system , its successful use of stress control , and achieved satisfactory results . Sunshine Temperature is an important issue affecting the bridge construction , the key to solving this problem is a box girder within the determination of the temperature field . By continuous observation for 24 hours of continuous rigid frame of the Yichang Yangtze River Railway Bridge in cantilever construction and closing stages , a detailed analysis of the temperature effect of the bridge , temperature gradient mode using the China Railway specification specification and New Zealand , to simplify calculations is closer with the measured results . Finally, simple measures to reduce the temperature stress . Yichang Yangtze River Railway Bridge is still under construction , stress control for arch ribs , the determination of the initial tension of the boom , concrete creep and shrinkage problem needs further study .
|