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Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

本文采用简化的新构造方式,开发研制了一种适用于大吨位应用的TJⅡ型屈曲约束支撑,并确定了其承载力计算方法和刚度、节点设计的准则。利用尝试性的试验结果,改进了细部构造。采用宝钢新研制的BLY225低屈服点钢,制作了两根屈服承载力为650吨、长度为8米的足尺试件,进行了往复加载试验。试验结果表明TJⅡ型屈曲约束支撑具有很好的滞回性能和耗能能力,累计塑性变形能力远超过美国钢结构抗震规范设计规程中的要求。

To eliminate the influence of concrete discreteness, quasi-static test of the same reinforced concrete (RC) column under different loading rates was carried out by the electro-hydraulic servo test system. The displacement-controlled loading, with loading rates of 0.2mm/s and 40mm/s, respectively, was adopted. The test results show that the mechanical properties of the specimen, such as the bearing capacity, stiffness degradation, bearing capacity degradation and cumulative energy dissipation, are directly related to the loading rate. The bearing capacity and cumulative energy dissipation of the specimens are improved under the loading rate of 40mm/s. With the increase of the loading amplitude, the influence of loading rate gradually decreases. Stiffness degradation and bearing capacity degradation of the specimens are more significant under rapid loading. With the increase of loading rate, the softening stage is shortened with more obvious damage process. Besides, the ductility of the specimen and the deformation capacity are decreased. The coupling interaction of bidirectional loading accelerates the failure process of the specimens. The cracking of the concrete, the buckling of the reinforcement bar, the spalling of the concrete and the yielding of the longitudinal reinforcement bar occur in the range of lower displacement level. With the increase of loading rate, the coupling interaction of bidirectional loading is further strengthened, and the deformation capacity of the specimen is obviously reduced. [ABSTRACT FROM AUTHOR]