为改进被动式调频TLCD的减振特性，提出了半主动变刚度TLCD减振系统，基本原理是将调频TLCD的弹簧设置成可调谐状态，在振动过程中，根据减振系统的需要适时调整调频弹簧的开关状态。减振系统的刚度由两部分组成，一部分是液体振动的恢复力，另一部分由变刚度装置的弹簧提供。由Lagrange方程建立起半主动变刚度TLCD的运动方程，以一个单自由度结构体系为算例，分析了可变刚度对系统控制性能的影响。外荷载频率与结构的频率比取不同值，比较了被动TLCD、半主动变阻尼TLCD和半主动变刚度TLCD的减振频带。考虑TLCD的频率和结构的实际频率之间存在一定的误差时，研究了半主动变刚度TLCD的减振性能。最后，通过一个五层结构的算例，分别在谐波和地震波作用下，验证了半主动变刚度TLCD对多自由度结构体系的减振特性。研究结果表明，半主动变刚度TLCD具有更宽的减振频带，在TLCD的频率和结构振动的频率存在误差时，仍能保持较好的减振效果。

To improve the control performance of passive adjustable frequency Tuned Liquid Column Dampers (TLCD), Semi-active Variable Stiffness Tuned Liquid Column Damper (SAVS-TLCD) is presented in this paper, with the online adjustable stiffness of additional springs. The state of additional stiffness can be ON or OFF according to the requirements of the control system during the vibration process. The stiffness of the vibration control system includes two parts, on of which is provided by the restore force of liquid motion and another one of which is provided by the spring of the variable stiffness device. The equation of motion of the SAVS-TLCD is derived by the Lagrange equation. The influence of variable stiffness on the control performance is numerical analyzed through a single degree of freedom structure. The frequency widths of reduction are compared for passive TLCD, semi-active variable damping TLCD and semi-active variable stiffness TLCD with different frequency ratios of external load to the structure. The control performance of SAVS-TLCD is also studied on the condition that there is a little error between the frequency of TLCD and the structure. The control performance of SAVS-TLCD to multiple degree of freedom system is verified by a five-story structure subjected to harmonic and earthquake excitations. The results indicate that SAVS-TLCD has larger frequency width of reduction and can still be effectiveness though there is a little error between the frequency of TLCD and the structure.