Evaluation and rehabilitation of critical concrete infrastructure

这项研究的目的是评估和修复关键钢筋混凝土结构。德拉协和式立交桥的脆弱坍塌突显了这样一个事实，即许多老桥都很脆弱。这项研究将研究厚板的剪切反应，以确定剪应力集中的影响，以及“尺寸效应”对剪切承载力的影响。将对具有复杂应力流动的“干扰”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。将研究典型细部缺陷的影响，并开发新的翻新技术。一项研究计划将研究更复杂的方法来评估和加固现有的基础元素，如桩帽和基座。另外一个实验和分析程序将研究防止楼板结构“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.