Study On Construction Control Theory Of Stress-free Status Methods For Continuous Steeltruss Bridge

Steel truss bridge construction generally use the phased installation of construction methods, must go through a multi-stage structure components and systems installed on the complex process of transformation. To ensure the construction of the bridge structure during the completion of the security and the internal force and linear bridge structure to meet the design requirements, construction is necessary to use appropriate engineering measures on the construction of the bridge construction process control.This paper reviews the theory of construction control without stress and without stress state law, from the structure of the final state and structure of the relationship between the construction process to start, based on structural bars no amount of stress built bridges among the state and the construction Bridge links the state to solve the continuous steel truss girder bridge during construction of the bar intermediate deformation and force bu certainty, the main contents include:1. Based on stress-free construction of control theory, analyze the Shang xin bridge structure during construction of the force and displacement of bars, the measured data compared with the theoretical data, obtained after the bridge into the internal force and linear to very good meet the design requirements, explain the steel truss bridge with no stress method is successful construction monitoring.2. Analyze of the main truss of local bars and the overall stability during the construction, to determine the structure of the stability factor Construction phase, finding the most unfavorable construction phase, and the corresponding construction control measures to ensure a smooth erection of the bridge completed.3. After the bridge, analyze the overall stability of the Shang xin bridge, while analyze the overall node of bar force, reach conclusion the overall stiffness influence of the full bridge node,and the Force the overall local node, for A steel truss bridge rods installed to provide a theoretical basis.