Seismic performance of steel concentrically braced frames

中心支撑框架（CBF）是一种常见的抗震体系，因为它们具有良好的延性，以及满足规范规定的位移限制的能力。为了确保这种延性，HSS支撑通常开槽并现场焊接到节点板上。这是昂贵的，复杂的质量控制，并从设计级地震的损坏，这种连接很可能是难以修复。此外，尽管在地震荷载下的CBF的数值模拟的进步，仍然需要进一步的数值模拟，以准确地量化的全球行为的钢中心支撑框架在地震期间。 该研究项目将解决局部连接设计和钢CBFs的全球数值模拟的双重问题。与业界合作，将进一步开发和实验验证拟议的替代连接细节。根据这些测试的结果，将制定设计指南，以帮助执业工程师。此外，将对CBF的整体抗震性能进行高级数值分析，以确定拟议连接对CBF在地震要求下抗倒塌能力的影响。 通过开发新的连接细节和提高对CBF抗震性能的理解，这项研究有望在地震区产生更安全、更经济的钢结构。这将使钢铁更具竞争力，使工业合作伙伴受益，使建筑施工更具经济可行性，使建筑业主受益，使抗震设计更安全，更可靠，使公众受益。

Concentrically braced frames (CBFs) are a common seismic force resisting system because of their good ductility, together with their ability to meet code-mandated drift limits. To ensure this ductility, the HSS brace is commonly slotted and field welded to the gusset plate. This is expensive and complicates quality control, and the damage to this connection from a design-level earthquake is likely to be difficult to repair. Moreover, despite advances in the numerical simulation of CBFs under seismic loads, there remains a need for further numerical modelling in order to accurately quantify the global behaviour of steel concentrically braced frames during earthquakes. This research project will address the twin issues of local connection design and global numerical modelling of steel CBFs. In collaboration with the industry, a proposed alternative connection detail will be developed further and validated experimentally. Based on the results of these tests, design guidelines will be developed to aid practicing engineers. In addition, advanced numerical analyses of the global seismic behaviour of CBFs will be conducted in order to determine the effects of the proposed connection on the ability of CBFs to resist collapse under seismic demands. By developing a new connection detail and improving the understanding of the seismic performance of CBFs, this research is expected to lead to safer and more economical steel structures in seismic areas. This will benefit the industrial partners by making steel more competitive, it will benefit building owners by making building construction more financially viable, and it will benefit the public by enabling safer and more reliable seismic design.