Actuality Evaluation And Repair On Tunnel Structure Of Existing Underground In Tianjin

The project of new underground in Tianjin has been carried into effect, in whichthe part of existing underground will still be used. In order to evaluate the actuality ofthe old underground. we do several jobs as follows. We investigate the oldunderground and the detail of building disease ; Several test were performed on thespot; We got several samples from the structure of existing underground and test theirstructural ability in the lab; Based on test result, we draw a conclusion of actuality forthe structure of old underground; We analyze the reason of structure disease whichoften been detected in underground project, and some advice was put forward in thearticle. The theory of structural reliability, reliability analysis method and the designingmethod of limit state have been applied in practice for several years. How to calculatethe reliability index of a exiting building and evaluate the reliability of the building isthe main aspect of the application of structural reliability theory. In this article, we tryto calculate the reliability index by reliability analysis method based on the structuralsystems reliability theory to confirm the reliability of the old underground.