Construction-Accuracy Analysis Of Long-span Rigid Frame Bridge During Construction Control

With good performance of mechanism, the rigid frame bridge is one of the most widely used types of bridge structure nowadays. With length span continuous rigid frame bridge appears,all kinds of uncertainty have been arisen, and the engineering construction is faced to unprecedented high-risk., With the rapid economic development in recent years, China's rapid traffic growth.. Together with many large span rigid frame bridge are located in the mountain gorge, the construction conditions are very limited, the construction is very difficult, resulting in high costs of bridge construction. Smooth closure of length bridge structure, without leaving any hidden dangers worthy of study was opened to traffic, so the risk of construction control precision problems is highlight. In this paper, long-span rigid frame bridge construction control risk as the main object of study, a study around the following aspects:(1). risk identification for bridge construction control error. Cited a study from the management level, the general method of risk identification, Clear the construction control risk identification error numerical method-Sensitivity analysis of design parameters. Design parameters for each numerical analysis to determine risk factors, provide a basis for further study.(2). Risks identified in the construction of control risk based on the estimated probability. Grasp the principal contradiction of the main aspects in line with the general scientific principles, away from the secondary contradictions, finite element, neural networks, Monte Carlo theory put forward FNM (Finite element method-Neural network-Monte Carlo) method for solving construction control risk events probability. This method effectively solves the stochastic finite element method calculation of the probability of large defects risk, improve the efficiency of estimation of the probability of risk.(3). Bridge construction estimates of risk consequences. Described the consequences of bridge construction is estimated that the basic principles of risk:the risk of the consequences of the construction of the bridge to be systematic and comprehensive studies; proposed risk estimation model the consequences of the construction principle, the consequences of the establishment of a risk estimation model bridge construction to realize the consequences of the risk of bridge construction quantitative estimates.(4).Bridge Construction Control Risk Assessment and Index System. Bridge construction expounded the basic principles of risk assessment; established comprehensive risk assessment model for bridge construction; established risk acceptance criteria and risk assessment criteria are represented by the risk assessment system bridge construction, bridge construction to realize the multi-angle control risk, comprehensive evaluation.(5). Bridge construction risk response and decision. The risk of a variety of coping strategies Bridge Construction:Bridge construction expounded the basic principles of risk control decision-making, the scientific and reasonable, comprehensive bridge construction principles and risk decision making guidelines to address how to select the optimal control scheme and the construction the best risk response strategy, and for risk decision-makers an important decision-making.(6). In this paper, control risk analysis of beishan bridge construction as an example. Using this risk by establishing a comprehensive analysis of bridge construction methods and structural systems, construction on the North Mountain Bridge, a comprehensive risk analysis, risk analysis for the bridge construction theory and methods in practical engineering applications and development of the reference.