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

本研究的重点是修复结构的仿真工具的开发。将开发两个独立的项目：第一个项目涉及使用纤维增强聚合物（FRP）修复混凝土结构，第二个项目涉及使用非开挖技术修复管道的抗震性能。1)项目1：采用外粘接纤维增强聚合物的方法加固混凝土结构，目前已被认为是替代昂贵的替代结构的可行方法。试验研究证明了该加固技术对提高结构强度的有效性。然而，frp加固混凝土结构在极限荷载条件下的破坏往往是危险的脆性和没有任何预警。系统的结构响应是由FRP和混凝土之间的界面的行为控制。本项目旨在开发一个frp -混凝土界面的仿真工具。这将有助于更好地理解修复混凝土结构中的应力传递，并改进设计过程。2)项目二：项目二主要研究修复管线的抗震性能。像任何结构一样，由于老化和许多其他因素，管道会累积损坏。改造这些基础设施的经济技术之一是在损坏集中的区域的管道内插入套筒。这项技术被称为非开挖修复。本研究将回答以下问题：修复干预后管道的预期结构响应是什么？这里的目标主要是为这个复杂的问题开发一个分析工具。该项目的社会经济影响是显而易见的，特别是对世界上地震多发地区。

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.