摘要
通过将传统Y型偏心支撑中耗能梁段制作材料更换为形状记忆合金(Shape Memory Alloy,简称SMA),提出了一种具有自复位功能的新型Y型偏心支撑钢框架结构。为研究此新型自复位结构的滞回性能,采用ANSYS软件建立精细化有限元模型,并进行数值分析。通过改变钢柱截面、钢梁截面、耗能梁段腹板厚度、耗能梁段长度及支撑截面尺寸,设计了5组11个自复位Y型偏心支撑钢框架结构,考察了各参数对其自复位性能及滞回性能的影响。研究发现钢柱截面及耗能梁段腹板厚度对结构承载力、初始刚度影响显著;钢梁截面、耗能梁段长度及支撑截面尺寸对承载力、初始刚度有一定影响。此外,随着SMA耗能梁段水平剪力承担比例的增加,结构复位效果显著提高。
An innovative self-centering Y-shape eccentrically braced steel frame is presented through using shape memory alloy（ SMA）to fabricate the link beam. Numerical analysis of detailed finite element model（ FEM） is carried out using ANSYS software in order to study the hysteretic behavior of this innovative self-centering structure. A total of eleven Y-shape eccentrically braced steel frames are designed and analyzed under cyclic load to consider the effects of relative design parameters on the structural self-centering and hysteretic behavior,including steel column section,steel beam section,the thickness of link beam web,the length of link beam,and brace section. The results show that steel column section and the web thickness of link beam have significant effects on the lateral strength and initial stiffness. The steel beam section,brace section,and link beam length have moderate effect on the lateral strength and initial stiffness. Additionally,the self-centering behavior increases linearly with the increase of lateral shear sustained by the ratio of link beam.
出处
《工程抗震与加固改造》
北大核心
2016年第4期56-63,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51108292)
江苏省高校自然科学研究项目(15KJB560008)
江苏省"青蓝工程"优秀青年骨干教师资助项目
关键词
形状记忆金属
偏心支撑
自复位
残余变形
滞回性能
shape memory alloy（SMA）
eccentrically brace
self-centering
residual displacement
hysteretic behavior
