高性能铝合金结构体系应用的关键问题研究

铝合金轻质、高效、耐腐蚀，具有广阔的工程应用前景,但其延性和焊接热影响对应用造成一定困难。申请人主编的《铝合金结构设计规范GB50429-2007》总结了铝合金结构研究成果、促进了工程应用，同时工程应用对铝合金结构研究提出了新课题。本项目致力于研究解决铝合金结构材料、节点、体系的关键问题。一、满足工程要求的改性铝合金材料及其力学性能问题；二、具有连续传力机制的铝合金节点构造、性能和破坏机理问题；三、充分发挥铝合金材料和制作特性的新型单元和体系的创新问题；四、新型铝合金结构的设计理论问题，包括结构阻尼比参数、大尺度构件稳定设计、结构体系稳定等。通过理论、试验和现场监测研究，提出改性铝合金化学成分、力学性能及设计指标；创建铝合金新节点、新单元和新体系；提出应用必须的铝合金结构设计参数、理论和方法，为已批准的国家标准《铝合金结构技术规范》修编工作提供理论依据，为铝合金结构进一步推广提供技术支撑。

Aluminum alloy has wide application prospect because of its excellent performances of lightweight, high effects and corrosion resistance. However, its weakness, such as low ductility and HAZ softening adjacent to welds, limits its further applications. The applicant was the editor-in-chief of "Code for design of aluminum structures" (GB50429-2007) and research achievements of aluminum structures were summarized in the code. The application of the code promotes the development of aluminum structure engineering, and new research topics in turn are put forward with the wide application of aluminum structures. The project is devoted to the study of key issues on materials, joints and systems of aluminum structures. First, to meet engineering requirements, mechanical properties will be studied and improved through measures such as adjusting chemical composition of aluminum alloys; Second, to realize force transmission mechanism continuously, new types of aluminum connections will be developed and the construction、performance and failure mechanisms of aluminum connections will be further studied. Third, to give full play to performances and characteristics of ease to manufacture of aluminum alloys, aluminum alloy components and systems will be innovated. Fourth, further studies on design theories of aluminum alloy structures will be needed to developed, including determining structural damping ratio parameters, stability design for large-scale aluminum component, overall stability for aluminum structural systems and so on. In short, through theoretical and experimental methods, combining with the on-site monitoring, the chemical composition of new aluminum alloys will be suggested, mechanical properties and design indexes of the aluminum alloys will be proposed; new connections, new components and new system of aluminum structures will be developed; the necessary design parameters, theories and methods of aluminum structures will be summarized for applications. The systematic research will provide theoretical basis for the revision work of the national standard "Technical specification of aluminum alloy structures" which has already been approved. Technical supports will be given for further promotion of aluminum structure engineering.