Steel Braces Optimization Design of Steel Tall Building Based on Stiffness Performance Sensitivity Data

Abstract

Complex high-rise steel structures have many design variables. Through sensitivity analysis of grouping of different types of components, it can be determined that optimizing the form, quantity and arrangement of steel braces can effectively reduce the maximum inter-story drift, which is the controlling wind response of the structure, so as to save the time cost of optimization. Adjusting the form, quantity and arrangement of steel braces to achieve the ideal steel consumption on the premise of satisfying the limit of maximum inter-story drift is a process of re-analyzing the modified results and guiding the next modification until the results converge. An effective re-analysis method can also reduce the calculation times and save the time cost of optimization. In the optimization process, sensitivity analysis and reanalysis are indispensable. In this paper, high-rise braced steel frame structure is taken as the research object and the steel braces are divided into groups according to different vertical zones and different plane positions, to analyze the sensitivity of maximum inter-story drift under wind load to different groups of steel braces, and to study the reanalysis method of specific steel structure system, specific design constraints, and specific optimization variables, so as to achieve rapid and efficient optimization design. Finally, a 150 m high-rise steel structure residence is taken as an engineering case to verify the correctness of sensitivity analysis results of high-rise steel structure for wind vibration stiffness performance control, and the effectiveness and practicability of re-analysis method in optimization design.