摘要
为进一步研究混合试验方法的有效性以及高强钢组合K形偏心支撑钢框架的抗震性能,建立了一套基于OpenFresco试验平台的混合试验系统,进行了一个1∶2缩尺的3层高强钢组合K形偏心支撑钢框架结构模型的混合试验。首先通过小工况的预加载研究试验系统的有效性,分析了试验子结构的位移加载精度,作动器加载时差。然后对试件进行正式的混合试验加载,分析了高强钢组合K形偏心支撑钢框架结构在不同工况下的自振频率、位移反应、水平地震作用、滞回性能以及关键部位应变。结果表明:作动器加载位移峰值与计算位移峰值比较接近,最大相对误差为13.60%,各工况下作动器平均每步的加载时差保持在20 ms左右;随着地震波加速度峰值的增大,模型的自振频率下降,刚度出现了一定的退化。各层的变形主要产生在消能梁段的腹板处,以剪切变形为主。模型结构在多遇地震和罕遇地震作用下的最大层间侧移角分别为1/1068和1/197,符合抗震设计规范对层间侧移角限值。综上,基于OpenFresco试验平台的混合试验系统能够较好的反应结构的地震响应,高强钢组合K形偏心支撑钢框架结构具有良好的抗震性能。
A loading system of hybrid testing based on OpenFresco was established to study the effectiveness of the system. A hybrid test of a 1/2 scaled three-story high strength steel composite K-eccentrically braced steel frame (K-HSS-EBF) was conducted to investigate the seismic performance of the structure model. The effectiveness of the test system is studied by preloading the specimen under small load conditions. The displacement loading precision of the experimental substructure and the loading time difference of the actuators are analyzed. The natural frequency, displacement response, horizontal seismic force, hysteretic behavior and the strain of key parts were obtained from the hybrid test. The results show that the peak displacement of the actuator is close to the calculated peak displacement. The maximum relative error is 13.60% and the average loading time difference of the actuator was kept at approximately 20 ms under different conditions. With the increase of the seismic peak acceleration, the natural frequency decreases and the stiffness of the structure degrades slightly. The deformation of each story is mainly in the web of the energy dissipation beam, which is mainly shear deformation.The maximum inter-story drift of the model structure under the frequent and rare earthquakes are 1/1068 and 1/197, respectively, which meet the inter-story drift limit in the seismic design code for buildings. In conclusion, the hybrid test system based on OpenFresco can better respond to the seismic response of the structure and the K-HSS-EBFs have good seismic performance.
作者
李腾飞
苏明周
隋龑
马磊
韩丹
LI Teng-fei;SU Ming-zhou;SUI Yan;MA Lei;HAN Dan(Key Laboratory of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi’an Univ of Arch & Tech,Xi’an,Shaanxi 710055,China)
出处
《工程力学》
EI
CSCD
北大核心
2019年第4期100-108,124,共10页
Engineering Mechanics
基金
国家自然科学基金项目(51178382)
陕西省教育厅重点实验室项目(16JS048
16JS049
17JS061)
