摘要
为了改善交错桁架结构的抗震性能,对空腹式交错桁架和混合式交错桁架分别内填Y形偏心腹杆,形成纯偏心腹杆式交错桁架和混合偏心腹杆式交错桁架结构。对两种偏心腹杆式桁架单元试件进行了低周反复荷载试验,分析了试件的滞回性能、耗能能力、延性、承载力和刚度退化规律。试验结果表明:两种偏心腹杆式交错桁架单元试件的滞回曲线比较饱满,耗能性能较好;耗能段的滞回曲线较整体结构的滞回曲线饱满,偏心腹杆式桁架单元主要由耗能段耗散能量;两个试件的能量耗散系数、位移延性系数比较接近;在每级循环荷载中,试件的承载力降低较少,接近破坏时,试件的承载力下降较多;纯偏心腹杆式桁架单元的变形能力优于混合偏心腹杆式桁架单元的变形能力;混合偏心腹杆式桁架单元抗侧刚度比纯偏心腹杆式桁架单元抗侧刚度大,前者刚度退化相对后者快。
To improve the energy dissipation performance of a staggered truss, an eccentrically web members staggered-truss （EWST） and a mixed eccentrically web members staggered-truss （MEWST） are proposed by filling Y eccentrically web members between the vertical web member of a staggered truss. Two kinds of truss specimen were carried out under low reversed cyclic loading. The hysteretic behavior, energy dissipation, ductility, bearing capacity and rigidity degeneration of specimens are analyzed. Results show that： the hysteresis loops of eccentrically web members of a staggered-truss are plump and the structure can dissipate the input energy well. The hysteretic loops of the links are plumper than the loops of the whole structure; the energy inputted into specimens is mainly dissipated by the links. Both energy dissipation coefficients and displacement ductility of two specimens are close. The deformation of the EWST is better than the MEWST. The bearing capacity decreases slowly in each cyclic loading level, it decreases quickly when specimens close to collapse. The stiffness of the MEWST is higher than that of the EWST, and the stiffness of the former structure decreases more rapidly than the other one.
出处
《工程力学》
EI
CSCD
北大核心
2013年第12期71-77,共7页
Engineering Mechanics
基金
国家自然科学基金项目(51078248)
江苏省重点实验室项目(ZD1002)
关键词
交错桁架
耗能能力
滞回性能
破坏机理
偏心腹杆
staggered truss structure
energy dissipation capacity
hysteretic behavior
failure mechanism
eccentrically web members
