Numerical simulation of FRP strenghtned RC structures 2) seimic analysis of rehabilitated buried pipelines

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This research focuses on the development of simulation tools for rehabilitated structures. Two separate projects will be developed: the first project concerns the rehabilitation of concrete structures using Fiber Reinforced Polymers (FRP) and the second deals with the seismic performance of pipelines rehabilitated using trenchless technology. 1) Project 1: The strengthening of concrete structures by means of externally-bonded fiber reinforced polymers is now accepted as a viable alternative to the costly radical solution of replacing the structure. Experimental investigations have proved the efficiency of this strengthening technology to enhance the strength of structures. However, the failure of FRP-strengthened concrete structures under ultimate loading conditions is often dangerously brittle and without any warning. The structural response of the system is controlled by the behaviour of the interface between the FRP and concrete. This project aims at developing a simulation tool for FRP-concrete interfaces. It will contribute to better understand the stress transfer in the rehabilitated concrete structure and improve the design process. 2) Project 2: The second project focuses on the seismic performance of rehabilitated pipelines. Like any structure, pipelines accumulate damage due to aging and many other factors. One of the economical techniques for retrofitting those infrastructures consists of inserting a sleeve within the pipe in the region where damage is concentrated. This technology is known as trenchless rehabilitation. This research will be undertaken to answer the following question: What is the expected structural response of the pipeline after rehabilitation intervention? The objective here is primarily to develop an analysis tool for this complex problem. The socio-economical impact of this project is evident especially for earthquake prone regions in the world.