1) Design of fibre reinforced concrete structural elements; 2) constitutive model for reinforced concrete members; 3) ductility of composite plate girders with slender webs

拟议的研究计划包括三个研究项目，它们是过去和正在进行的项目的直接延续。所有的研究项目都结合了实验室测试和分析方法。1)钢纤维混凝土（SFRC）结构单元设计。该项目的主要目标是为钢纤维增强混凝土的结构使用开发一种设计方法和相关材料测试。本项目是申请人积极参与的一项国际研究工作的一部分。它专门解决了钢筋和预应力混凝土梁的设计在弯曲和剪切在适用性，疲劳和极限状态。它还包括使用SFRC护套对有缺陷的矩形桥墩进行抗震加固。2)钢筋混凝土结构本构模型的发展。该项目的目标是为研究和工程界提供一个复杂而通用的三维本构模型，用于预测混凝土构件在使用中的行为、最终能力和破坏机制。该模型已在研究中用作实验研究的补充，并作为复杂几何结构的预测工具。研究活动的重点是介绍SFRC的拉伸和压缩特性，并为模型提供模拟反向循环加载条件下粘结和搭接破坏模式的能力，作为约束水平的函数。3)细长腹板组合（钢/混凝土）板梁的延性。该项目旨在为加拿大公路桥梁设计规范制定指导方针，以确保板箱梁桥具有足够的延展性。该项目解决了在全尺寸试验中观察到的细长腹板梁缺乏延性的问题。该项目将为最新的桥梁规范版本所采用的设计方法建立几何限制，以避免新桥设计中的关键情况，或允许在现有桥梁评估的情况下估计可用延性。

The proposed research program includes three research projects which are a direct continuation of past and ongoing projects.  All research projects combine laboratory testing and analytical approaches. 1) Design of steel fibre reinforced concrete (SFRC) structural elements. The main objective of the project is to develop a design methodology and the associated material testing for the structural use of steel fibre reinforced concrete. This project is a part of an international research effort to which the applicant has been contributing actively. It addresses specifically the design of reinforced and prestressed concrete girders in flexure and shear at serviceability, fatigue and ultimate limit states. It also includes the seismic retrofitting of deficient rectangular bridge piers using SFRC jackets. 2) Constitutive model development for reinforced concrete structures. The objective of the project is to provide research and engineering communities with a sophisticated and general 3D constitutive model for predicting the behaviour in service, the ultimate capacity and the failure mechanisms of concrete members. This model has been used in research as a complement to experimental investigations, and as a predictive tool for structures with complex geometry. The activities focus on introducing SFRC properties in tension and compression, and on providing the model with the ability of simulating bond and lap splice failure modes under reversal cyclic loading conditions as a function of the confinement level. 3) Ductility of composite (steel/concrete) plate girders with slender webs. This project aims at developing guidelines for the Canadian Highway Bridge Design Code that ensure a sufficient level of ductility in plate and box girder bridges. The project addresses the problem of lack of ductility for girders with slender webs observed experimentally in full scale tests. The project will establish geometrical limits to the design approach adopted by the latest Bridge Code edition that would avoid critical situations in the design of new bridges, or allow estimating the available ductility in the case of existing bridge evaluation.