Study Of Structural Health Monitoring Of Qingdao Bay Bridge Engineering

With China's economic development,infrastructure system is also developing rapidly in recent decades. All kind of bridges play an important role in transportation engineering. The bridge safety of its structure is essential during its service period. A variety of structural damage may occur in the process of the long-term use, resulting in reduction of its safety and degradation of its service function. Bridge safety monitoring is particular useful to avoid catastrophic accedents.The Qingdao Bay Bridge engineering is a state-level key project. It includes a suspension bridge (the Daguhe waterway bridge) and two cable-stayed bridges (the CangKou waterway bridge and the Red Island waterway bridge).The structural health monitoring plays an important role in the period of its service. Taking the Qingdao Bay Bridge as the background in this paper, with an eye to the practical application, the structural health monitoring was researched. The paper was organized by main components of the Qingdao Bay Bridge Structural Health Monitoring.The content of the paper mainnly includes the following aspects: (1) Real-time data acquisition has been studied.Based on the finite element analysis, sensors layout plan was developed and main data acquisition equipments were selected. In accordance with safety, durability, applicability, manual data acquisition program was developed. (2) Modal analysis and various types of damage index were studied accordingly. Modal analysis was given a detailed calculation process of each method, which was programmed and simulated, including modal analysis pretreating method (RDT, NExT), modal parameter identification method ?(ERA, SSI) and auxiliary processing means of modal parameter identification (EMD). (3) For data evaluation, safety evaluation and durability evaluation of the Qingdao Bay Bridge were closely studied. Specific assessment strategy and implementation process was developed. For the safety evaluation, analytic hierarchy process combined with reliability theory was used,in which reliability was calculated with Monte Carlo Method based on response surface. To meet the need of real-time evaluation, pre-damage analysis was put forward. For the durability evaluation, Analytic Hierarchy Process combined with Fuzzy was used. Additionally, the paper has builded safety evaluation model and durability evaluation model of the Daguhe Bridge. Examples of safety evaluation and durability evaluation were demonstrated respectively.