圆钢防屈曲约束耗能支撑设计及力学性能研究

Research on Design and Mechanical Properties of Buckling-Restrained Energy Dissipation Braces with Round Steel

该文提出了一种以低屈服点圆钢棒材作为芯材的新型防屈曲耗能支撑,此耗能芯材的截面为圆形。从材料和构造的角度对防屈曲耗能支撑加以改进,简化结构构造,减少加工损耗,在保持产品性能符合现行标准的前提下,减少材料损耗和加工环节,从而降低成本;且通过减少焊接,同时增加一系列构造的措施,以加强产品的低周疲劳性能,减少耗能。通过理论公式和试验探究圆钢防屈曲约束耗能支撑的工作机理、力学性能及耗能能力,发现相比于钢板防屈曲约束耗能支撑,此设计可提高疲劳性能,累计塑性延性系数可达到1500以上。

This paper proposes a novel buckling-restrained energy dissipation brace(BREDB)utilizing low-yield-point round steel bars as the core material,with a circular cross-section for the energy dissipation core.The BREDB is improved from both material and structural perspectives,aiming to simplify the structure,reduce processing losses,and cut costs while maintaining product performance in compliance with current standards.By minimizing material wastage and processing steps,the design achieves cost reduction.Furthermore,a series of structural enhancements are introduced to strengthen the brace's low-cycle fatigue performance and reduce energy consumption,achieved through the reduction of welding.Theoretical formulations and experiments are conducted to explore the working mechanism,mechanical properties,and energy dissipation capabilities of the round steel buckling-restrained energy dissipation brace.The results indicate that compared to steel platebased BREDBs,this design enhances fatigue performance,with a cumulative plastic ductility factor exceeding 1,500.