地震作用下防屈曲支撑减震结构附加有效阻尼比计算及变化规律研究

发布时间：2018-01-23 02:45

  本文关键词： 防屈曲支撑 附加阻尼比 消能减震 自由振动衰减 双线性模型　出处：《振动与冲击》2016年02期 　论文类型：期刊论文

【摘要】：基于《建筑消能减震技术规程》(JGJ 279-2013)的附加有效阻尼比计算方法,推导防屈曲支撑(Buckling-Restrained Brace,BRB)减震结构等效单自由度体系的附加有效阻尼比计算式,分析主体结构处于不同工作阶段附加有效阻尼比变化规律,并用自由振动衰减法验证其变化规律的正确性。结果表明,主体结构弹性时,附加有效阻尼比随结构变形增加先增大后减小;主体结构塑性时,BRB附加给结构的有效阻尼比与结构屈服后刚度有关。讨论阻尼器型BRB(记为第Ⅲ类)设计原则,并分析结构第一阶段抗震设计时附加有效阻尼比的取值原则。
[Abstract]:An additional effective damping ratio calculation method based on "Technical Specification for Energy dissipation and damping of buildings" (JGJ279-2013). The additional effective damping ratio of buckling-Restrained BRBs for equivalent single-degree-of-freedom systems of anti-buckling bracing structures is derived. The variation law of the additional effective damping ratio of the main structure at different working stages is analyzed, and the correctness of the variation law is verified by the free vibration attenuation method. The results show that the main structure is elastic. The additional effective damping ratio increases first and then decreases with the increase of structural deformation. The effective damping ratio attached to the structure by BRB when the main structure is plastic is related to the post-yield stiffness of the structure. The design principle of damper type BRBs (referred to as Class 鈪，

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