Damage Identification For Existing Reinforced Concrete Bridge And Research On Prediction Of Life

Increasingly developed in traffic today, played their various modes of transportation an important role, which as a road, railway, urban and rural roads and water conservancy construction across a variety of obstacles and has a carrying capacity of important structures - bridge traffic Transport to occupy an increasingly important role. In recent decades, China has built a large number of bridges, especially in the modern high-level construction of highways and urban viaducts. Bridge as an important part of the lifeline system, in the national economy and national defense building occupies a prominent place, the transportation of the throat, so its performance and operational status of the structure to be put forward higher requirements. To better protect people and property, quickly and effectively identify the location of the bridge structure damage and injury in time to make the remaining life of the bridge structure prediction has become one of the hot engineering.This paper describes the identification of the current field of bridge damage and life prediction of the status quo and development trend of the research paper described in detail the background and main contents.So far, the ideal bridge damage identification method is based on curvature mode of bridge damage identification. Curvature mode as a way to reflect structural changes in the local characteristics of the modal parameters, with the bridge structure by the vibration mode difference. Through theoretical analysis, the bridge structure of the local damage such as cracks and steel corrosion, etc., will not cause structural changes in the quality, but will lead directly to the local stiffness of the structure down, causing the curvature mode shapes and curvature mode curve difference curve occurs mutation, which is curvature mode theory provides theoretical support for the identification of bridge damage.Existing bridge structure over the remaining life prediction are also problems to be solved. In this paper, time-varying reliability theory, the bridge structure on the active time-varying reliability analysis, based on the structure of the attenuation law, detailing the remaining life of a real bridge structure prediction method and steps. Reliability theory based on remaining life prediction method has its basic features: You can use the reliability index or probability of failure to describe the structure of uniform safety standards, making predictions more precise and stable.This specific study as follows:1,Describes identification and life prediction of bridge damage the status and development trend and based on finite element theory, detailed curvature mode and differential mode theory of curvature.2,The analysis of curvature mode, modal curvature difference of simply supported bridges, continuous girder bridge damage identification of trends obtained curvature mode, modal curvature difference in the damage structure of the law.3,Using curvature mode, modal curvature difference in the damage structure of the law, with reference to ditch Bridge Xu relevant data, a finite element model, detailed simulation of bearings, and other places across the injury, the damage identification, and further draw curvature mode and differential mode curvature real bridge damage in the law and their own characteristics.4,Based on the time-varying reliability theory, the details of the real bridge the remaining life prediction methods and procedures.