Triangular-plate added damping and stiffness (TADAS) devices are reliable metallic energy dissipaters for seismic upgrading used in design and retrofitting of civil structures. Conventional TADAS devices are designed with closed-ended slots. In this study, a modified form of the TADAS device is proposed with open-ended slots in order to reduce the manufacture cost, facilitate the assembling and avoid abrupt stiffness increase. Cyclic and monotonic loading tests are then conducted to investigate the mechanical characteristics of the modified TADAS devices with regular Q345 steel and low-yield point LY160 steel triangular plates. The test results show that although the hysteresis performances are stable, the cyclic hardening behavior is different between the TADAS specimens with different grades of steel. The TADAS specimen with LY160 triangular plates exhibits more significant overstrength behavior than the one with Q345 triangular plates in cyclic loading, which is unsuitable to be described by the classic Bouc-Wen model. Therefore, a modified Bouc-Wen model is proposed to describe such overstrength behavior. It is shown that the modified model is able to simulate different extent of overstrength behavior in cyclic loading, based on which the cyclic hardening behavior of the TADAS specimen with LY160 triangular plates can be well described.

中文翻译：

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不同钢种的改进型TADAS设备的测试和评估

三角形板附加阻尼和刚度（TADAS）装置是可靠的金属耗能器，可用于土木结构的设计和翻新中的抗震升级。常规的TADAS设备设计有封闭式插槽。在这项研究中，提出了一种TADAS装置的改进形式，该装置具有开放式槽口，以降低制造成本，便于组装并避免突然的刚度增加。然后进行循环和单调载荷测试，以研究带有常规Q345钢和低屈服点LY160钢三角板的改进型TADAS装置的机械特性。测试结果表明，尽管滞后性能稳定，但不同钢种的TADAS试样的循环硬化行为不同。在循环载荷下，带有LY160三角形板的TADAS标本比具有Q345三角形板的TADAS标本具有更显着的超强度行为，这不适合用经典的Bouc-Wen模型进行描述。因此，提出了一种改进的Bouc-Wen模型来描述这种超强度行为。结果表明，改进的模型能够模拟循环荷载作用下不同程度的超强度行为，在此基础上可以很好地描述带有LY160三角板的TADAS试样的循环硬化行为。