Arch With Injury In Service Load Test And Evaluation Of Carrying Capacity

Arch bridges have many advantages, including beautiful appearance, economical and practical, wide varieties and wide application. Its also has ability to cross large and obvious advantages. However, as China's rapid economic development, highways, rail traffic is growing rapidly, the early construction of the bridge; there are many different degrees of injury and disease, such as cracking, leakage tendons, and reinforcement co-rrosion and so on. As the cumulative damage and disease, gradually reduce the capaci-ty of the bridge, followed by increasing the safety of the bridge is low, a lot of bridge design was well short of the life of life, even facing the danger of the Collapse.Therefore, assessment of damage in service with the carrying capacity of arch bridges, the reasonable type of arch bridge, the bridge has become one of world's important research topics.In this paper, detection of specific bridge engineering practices, the band used for many years injury curved arch bridge, truss arch bridge and the deck combination of reinforced concrete arch bridge for static load test and theoretical analysis of the three types of bridge load carrying capacity assessment. This includes:1. to three bridges with the actual injury as studied through field measurement and size, using the computational software, Dr. Bridges, MIDAS and other modeling and analysis of the structure to calculate the main section of the design load, to determine the static load control section layout position, calculate the control section of the theory of maximum stress and deflection, as the control of the stress test and control deflection.2. on the three bridges with the actual injury load test. Real-time monitoring load test conditions of each class section of the deflection load control and strain, deflection and strain in the measured value is less than the case of experimental control ongoing to ensure the safety of the bridge. Detailed description of the trial process, documenting the test data for the three bridges to provide a true assessment of the carrying capacity, specific data.3. From the deflection and strain in terms of both theoretical calculations and experimental values for comparison and analysis, assess the load carrying capacity of existing bridges; then on the three bridges to compare the existing capacity, carrying capacity has seen a good selection high safety, damage the smaller bridge, bridge design and plan for the Selection of a reference.