为研究仿古建筑钢框架结构的抗震性能，以位于抗震设防烈度8度区的某仿古建筑钢框架结构为原型，按1：2缩尺比例制作了试验模型，并对其进行了拟动力试验。输入地震动加速度峰值分别相当于8度多遇、8度设防和8、9度罕遇地震的El Centro波、汶川波和兰州波，实测了框架的位移反应、加速度反应和应变分布。研究了结构在地震波作用下的受力特点、滞回性能、耗能性能、加速度和位移时程曲线以及承载力与刚度退化规律等，并对结构进行了静力弹塑性推覆分析。研究结果表明：滞回曲线未出现明显的捏拢现象，结构耗能随着输入地震波幅值的增大而显著增加。在9度罕遇地震波作用下，中柱异型节点处的拱构件底部及正厅边柱斗构件屈服，骨架曲线仍未进入下降段，整体结构的承载力较高。在地震波作用下，本文研究类型的仿古建筑钢框架结构的层间位移角能满足我国现行抗震规范的要求，具有良好的抗震性能。
Abstract
To study aseismic performances of steel frame structures in Chinese archaized buildings, pseudo-dynamic tests were conducted on a scaled 1:2 model for an archaized building’s steel frame structure built in an area with a fortified aseismic intensity of 8. Seismic waves including El Centro wave, Wenchuan one and Lanzhou one were input with maximum peak accelerations equivalent to common earthquake intensity of 8, fortified earthquake intensity of 8, and rare earthquake intensities of 8 and 9. The frame’s displacement responses, acceleration ones and strain distributions were measured and recorded. The structure’s force-bearing characteristics, hysteretic performance, energy dissipation performance, time-history curves of accelerations and displacements, loading capacity and stiffness degradation laws were studied and the structure’s static pushover analysis was conducted. The results showed that there is no obvious pinch phenomena in hysteretic loops, the structural energy dissipation increases significantly with increase in seismic wave amplitude; under the action of rare earthquake of 9, the arch component’s bottom located at a special-shaped joint and the bucket component located at the side column in the main hall both yield, skeleton curves don’t enter the decline stage, the whole structure has a higher loading capacity; under the action of earthquake waves, the maximum inter-story drift of the model meets the requirements of the current Chinese aseismic code, the steel frame structure has a good aseismic performance.
关键词
仿古建筑 /
钢框架结构 /
拟动力试验 /
推覆分析 /
抗震性能
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Key words
Chinese archaized buildings /
steel frame structures /
pseudo-dynamic tests /
pushover analysis /
aseismic performance
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