Evaluation and rehabilitation of critical concrete infrastructure

本研究旨在评估和修复的关键钢筋混凝土结构。协和立交桥的脆弱倒塌突出了一个事实，即许多旧桥是脆弱的。本研究将探讨厚板之剪力反应，以确定剪力集中之影响，以及尺寸效应对受剪承载力之影响。将对具有复杂应力流的“扰动”区域进行研究，以确定评估旧桥中这些关键区域的方法。将进行实验和分析研究，以调查评估和修复旧混凝土桥梁和建筑物的方法。将研究典型细节缺陷的影响，并开发新的改造技术。一项研究计划将调查更复杂的方法来评估和加强现有的基础元件，如桩帽和基脚。一个附加的实验和分析程序将研究防止板结构“连续倒塌”的方法。

This research is aimed at the evaluation and rehabilitation of critical reinforced concrete structures. The brittle collapse of the de la Concorde Overpass has highlighted the fact that many older bridges are vulnerable. This research will study the shear response of thick slabs to determine the influence of shear stress concentrations, together with the "size effect" on the shear capacity. Research will be conducted on "disturbed" regions with complex flow of stresses to determine ways of evaluating these key regions in older bridges. Experimental and analytical studies will be carried out to investigate means of evaluating and rehabilitating older concrete bridges and buildings. The influence of typical detailing deficiencies will be studied and new retrofit techniques will be developed. A research program will investigate more sophisticated means of evaluating and strengthening existing foundation elements such as pile caps and footings. An additional experimental and analytical program will study means of preventing "progressive collapse" of slab structures.