第33卷第3期 2016年5月
土木工程与管理学报 Joumal of Civil Engineering and Management
Vol.33 No.3 May2016
自复位K型偏心支撑钢框架结构滞回性能
冷捷，刘文渊
（南京理工大学泰州科技学院，江苏泰州225300）
捕要：为解决传统K型偏心支择钢框架强震作用后残余变形过大的问题，通过将耗能梁材料更换成形状记忆合金（ShapeMemoryAlloy，简称SMA），实现K型偏心支撑钢框架结构的自复位。使用ANSYS有限元软件建立 K型偏心支撑钢框架结构的精细有限元模型，在验证有限元模型合理的基础上，对传统结构及自复位结构进行往复加载分析。并将两类结构的滞回曲线、应力分布、骨架曲线、延性、刚度退化、耗能能力及复位效果进行对比。研究发现自复位结构滞回曲线呈旗帜型，复位效果良好，应力分布及塑性机制与传统结构相似，延性水平及侧向刚度退化与传统结构相当，但耗能能力有所劣化。
关键词：形状记忆金属；偏心支撑；自复位；残余变形；滞回性能
中图分类号：TU391：TU352.1*1
文献标识码：A
文章编号：2095-0985(2016)03-0073-07
Hysteretic Behavior of an Self-centering K-Shape Eccentrically
BracedSteelFrame LENG Jie,LIU Wen-yuan
(Taizhou Institute of Science and Technology, Nanjing University of Science and Technology,
Taizhou 225300,China)
Abstract: In order to solve the excessive residual displacement of the traditional K type eccentrically braced steel frame after strong earthquake motions, an innovative self-centering K-shape eccentrically braced steel frame is presented through using shape memory alloy (SMA) to fabricate the link beam. The precise finite element model (FEM) of the K-shape eccentrically braced steel frame is developed using ANSYS software. After the reliability of the K-shape eccentrically braced steel frame FEM is verified, the hysteretic curves, the stress distribution, the skeleton curves, ductility, stiffness degradation, energy dissipation, and self-centering behavior of the self-centering structure are compared with the traditional structure by analysis of cyclic load. The results show that the hysteretic curves are banner type, the innovative K-shape eccentrically braced steel frame possesses excellent self-centering behavior and ductility, the stress distribution and plastic mechanism are similar to the conventional, ductility level and lateral stiffness degradation are equivalent to the traditional structure, but the energy dissipation capacity decreases.
Key words: shape memory alloy; eccentric brace; self-centering; residual displacement; hysteretic
behavior
为解决高烈度区强震作用时中心支撑易于屈曲，日本学者提出Y型偏心支撑的设想。随后加州大学伯克利分校的Popov等人(1-3)也提出偏心
收稿日期：2015-10-31修回日期：2015-12-08
支撑框架的概念，并进行大量试验研究不断完善该设计理论。偏心支撑框架结构设计时，将耗能梁弱化，其它构件强化，确保耗能梁先屈服，通过
作者简介：冷捷（1981-），女，江苏如人，讲师，硕士，研究方向为组合结构与钢结构抗震（Email：reishyou@aliyun.com）通讯作者：刘文测（1982-），男，江苏泰州人，讲师，硕士，研究方向为组合结构与钢结构抗露（Email；liuwenyuan82①sina.com）基金项目：江苏省高校自然科学研究项目（15KJB560008）
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