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

1）纤维混凝土结构构件设计；

• 批准号: 105623-2006
• 负责人: Massicotte, Bruno
• 金额: $ 3.16万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=390932
• 关键词: Design; fibre; reinforced; concrete; structural

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.

拟议的研究计划包括三个研究项目，这些项目是过去和正在进行的项目的直接延续。所有研究项目都结合了联合收割机实验室测试和分析方法。1)钢纤维混凝土结构构件的设计。该项目的主要目标是开发钢纤维混凝土结构使用的设计方法和相关材料测试。该项目是申请人一直积极参与的国际研究工作的一部分。它专门讨论了钢筋和预应力混凝土梁在正常使用、疲劳和极限状态下的弯曲和剪切设计。还包括使用钢纤维混凝土导管架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。该项目的目的是为研究和工程界提供一个复杂的和一般的三维本构模型，用于预测混凝土构件的使用性能，极限承载力和破坏机制。该模型已被用于研究作为实验研究的补充，并作为复杂几何结构的预测工具。活动的重点是介绍钢纤维混凝土的拉伸和压缩性能，并提供模型的能力，模拟债券和搭接接头的破坏模式，在反向循环加载条件下的功能的限制水平。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，确保板梁桥和箱梁桥具有足够的延性。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。本项目将为最新版《桥梁规范》采用的设计方法建立几何限制，以避免在新桥梁设计中出现关键情况，或允许在现有桥梁评估中估计可用的延性。