Research On Data Processing And Safety Evaluation Of Chongqing Shibanpo Changjiang Widen Reconstructed Bridge

In construction and use process, some parts of bridge may be damnified because of the environmental factors and material degradation. And the bridges can not work safely because of the damnification. Furthermore, the bridges are working in overload state because the traffic volume increases rapidly. These adverse factors can not only infect the safty of travel, but also shorten the working life of bridges, so much as the collapse of bridges. So it is indispensable to monitor the long-span bridges. Chongqing Shibanpo Changjiang Widen Reconstructed Bridge is a large bridge in downtown of Chongqing. The bridge bears heavy traffic volume. So a health monitoring system is installed in the bridge for ensuring the normal use and structural safety of the bridge.This paper is mainly the data processing and safety evaluation in health monitoring in the background of Shibanpo Bridge. The main works in the paper are following.â‘ Data processing. The actual measured values in health monitoring which are used in safety evaluation are obtained by processing the monitoring data in collection time. The mothod of data processing is based on the mathematics statistics.â‘¡Safety evaluation of whole bridge. Based on the theory of Analytic Hierarchy Process and mutative weighing, the datas of strain which are modified by temperature are used to evaluate the bearing capacity and the datas of deflection which are modified by temperature are used to evaluate the normal working capacity.â‘¢Based on the design drawing, a three-dimensional finite element model of joint of steel and concrete box girder are established. The model of joint of steel and concrete box girder is calculated in different load cases. The characteristic of the distributing of relative displacement is got from the result of calculation. And the general and damaged warning values are ensured based on the result of calculation and the actual measured values of joint of steel and concrete box girder.â‘£Safety evaluation of joint of steel and concrete box girder. Based on the theory of data processing, the monitioring datas of joint of steel and concrete box girder are processed. And the actual measured values are used to evaluate the joint of steel and concrete box girder by comparing the actual measured values to the limited value.