Exploration of Performance-Based Seismic Design Methods for Steel Structures and Their Improvement Research

The existing seismic design method based on GB 50011-2010 “Code for Seismic Design of Buildings” (referred to as the traditional code design method) does not consider the ductility difference of different structural systems, which can not effectively reflect the good seismic ductility of steel structures, and considering that it is difficult to realize the rapid updating of the traditional code design method in order to comply with the development and application of the new system and technology, it is imperative to develop the performance-based seismic design method. Considering that the traditional code design method is difficult to realize rapid updating to meet the development and application of new systems and technologies, the development of performance-based seismic design method is imperative.
The performance-based design methods involved in the existing major domestic codes and standards are compared and summarized, their main features and problems in application are sorted out, and the essence of performance-based design is clarified. Meanwhile, with reference to the current international advanced performance-based design ideas, and combined with the existing engineering practical experience, the improvement methods of the seismic performance-based design of the existing steel structure are investigated. From the design process, performance target setting, analysis method selection and evaluation criteria, it is suggested that the performance-based design should be upgraded to a parallel design method with the traditional code design method, so as to avoid the limitations of the code, such as the rule-based requirements. The improved method is more flexible than the existing traditional design method and can be applied to all kinds of high ductility or new architectures, including superconstructs. The ideas and concepts of this method can be expanded and applied to the special analysis of structures including wind resistance, fire protection, corrosion prevention and comfort, and the increasingly mature numerical simulation calculation can be used as an important means and basis for the design and evaluation of various types of performances, so as to further form and improve the performance design framework and process of the whole lifecycle of the steel structure, give full play to the good performances of the steel structure, and bring about a positive impact on the promotion of the application and development of steel structure in many fields. The results of this study are summarized in the following table.