传统风格建筑钢框架结构拟动力试验及弹塑性时程分析

Pseudo-dynamic test and elasto-plastic time-history analysis of steel frame structure in traditional style buildings

为研究传统风格建筑钢框架结构的抗震性能,按1:2缩尺比设计制作了试验模型,对其进行拟动力试验,得到钢框架结构在弹性和弹塑性阶段的应变分布、加速度反应、位移反应、滞回特性和耗能性能等,并采用有限元分析软件ABAQUS对试验框架进行弹塑性动力时程分析,得到其应力分布及破坏模式。研究表明:当El Centro波、Taft波、兰州人工波和汶川波的加速度峰值为70gal、200gal和400gal时,钢框架结构基本处于弹性阶段,没有出现明显的塑性变形和破坏。当汶川波的加速度峰值达到620gal时,柱Z-1的斗与柱Z-2大跨一侧的拱相继屈服,结构进入弹塑性阶段,此时结构的最大层间位移角为1/203,且骨架曲线仍呈上升趋势,说明该钢框架结构具有较强的抗侧能力和较高的承载力。结构的屈服顺序为斗栱先屈服,然后梁端屈服,最后柱脚屈服,该传统风格建筑钢框架结构的抗震性能优越。

In order to study the seismic behavior of steel frame structure of traditional style buildings, the experimental model was designed according to the scale of 1：2 proportion, and the pseudo-dynamic test was carried out to obtain the strain distribution, acceleration responses, displacement responses, hysteretic characteristics and energy consumption in the elastic and elastic-plastic stages. The elastic-plastic dynamic time history analysis of the test frame was carried out by the finite element analysis software ABAQUS, and the stress distribution and failure modes were obtained. The results show that when the peak acceleration of El Centro wave, Taft wave, Lanzhou artificial wave and Wenchuan wave is 70 gal, 200 gal and 400 gal, respectively, the steel frame structure is basically still in elastic stage, and there is no obvious plastic deformation and failure. When the acceleration peak of Wenchuan wave is 620 gal, the Dou of Z-1 column and the Gong of the long-span side of Z-2 column are successively yielded, and the structure enters the elastic-plastic stage. At this time, the maximum interlayer displacement angle of the structure is 1/203, and the skeleton curve still has an upward trend, which shows that the steel frame structure has stronger lateral resistance and higher bearing capacity. The structure yields in the bucket, the beam and the column in sequence, which indicates that the seismic performance of the steel frame structure in traditional style buildings is excellent.