框架-BRB结构考虑弯曲型变形的抗侧刚度及设计参数

Calculation of Inter-story Stiffness and Relative Design Parameters in Frame With BRB Considering Flexural Deformation

由于目前框架-BRB结构设计方法是基于结构层间位移全部由楼层剪切型变形造成,忽视了结构弯曲型变形的影响.为了准确计算防屈曲支撑提供的层间抗侧刚度,在现有层间剪切模型分析方法基础上,讨论结构弯曲型变形对框架-BRB结构影响规律.提出考虑结构弯曲变形下的层间抗侧刚度计算公式,并通过有限元方法验证.提出了抗侧刚度变化系数,考虑结构在弯曲型变形下BRB的相关设计参数的计算,抗侧刚度变化系数可应用在等效线性化设计方法中.

Traditional design method of FBRB（ frame with buckling-restrained braces） which only considered inter-story shear deformation,ignoring flexural deformation of FBRB,did not conform to the deformation characteristic of FBRB. For accurately calculating the inter-story lateral stiffness,the authors presented formulas to calculate inter-story stiffness of BRB and the stiffness adjusting coefficient,considering flexural deformation and basing inter-story shear deformation model. Some design parameters of BRB were discussed under considering flexural deformation,and these parameters could be used in equivalent linearization method.