Assessment and rehabilitation of existing steel structures

该项目旨在开发老化、受损或强度不足钢结构的修复和评估技术。三种不同的钢结构，中心支撑钢框架，疲劳损伤钢结构，埋地钢管道，将在该项目中进行研究。预计该项目将取得以下成果。1.本文提出了一种新型节点板连接体系，作为中心支撑钢结构抗震耗能减震体系。在节点板设计中将使用机械变形增强细节和高性能钢，以实现所需的变形能力。2.提出了一种利用纤维增强复合材料修补疲劳损伤钢结构的设计方法。该项目将开发修改后的S-N曲线来预测玻璃钢修复钢元件的疲劳寿命。此外，还将对FRP设计进行优化，以解决各种设计问题。最后，还将进行可行性研究，以研究玻璃钢修复钢管应力腐蚀裂纹的有效性。3.将开发加拿大北部埋地管道的实时结构监测系统。该系统将采用最新的埋地管道知识和结构健康监测的新技术。该系统将具有监测和检测管道屈曲和埋地管道低周疲劳破坏的能力。

The project is to develop rehabilitation, as well as assessment, technologies for aging, damaged, or strength deficient steel structures. Three distinct steel structures, concentrically braced steel frames, fatigue damaged steel structures, and buried steel pipelines, will be studied in the project. The following results are expected to be accomplished from the project. 1. Innovative gusset plate connection system will be developed as the energy dissipaters for seismically-deficient concentrically-braced steel structures. Both mechanical deformation enhancement details and high performance steel will be used in the gusset plate design to achieve the desired deformability. 2. A design method will be developed for using fibre reinforced polymer (FRP) patching to repair fatigue damaged steel structures. A modified S-N curve will be developed in the project to predict the fatigue life of FRP repaired steel elements. In addition, optimization of the FRP design will also be carried out to address the various design concerns. Finally, a feasibility study will also be carried out to study the effectiveness of the FRP repair on steel pipes with stress corrosion cracks. 3. A real-time structural monitoring system for buried pipelines in the Canadian North will be developed. The state-of-the-art knowledge on buried pipelines and the new technologies in structural health monitoring will be used in the system. The system will have capability in monitoring and detecting the pipe buckling and the low cycle fatigue failure of a buried pipe.