Seismic isolation is proven to be an effective technology for seismic protection of building structures, equipment, and industrial facilities. The majority of the existing isolation systems and techniques are related to horizontal ground motions, whereas there are only a few vertical isolation systems. The main reason is because of the conflict concerning the demand for isolation stiffness. More specifically, a vertical isolated system must have sufficient vertical rigidity to sustain the weight of the isolated object/system and retain the static vertical deflection in reasonable limits. On the other hand, the isolated system must also have enough flexibility to isolate the accelerations. In order to overcome this difficulty, a novel vertical seismic absorber system is proposed, that combines negative stiffness-driven absorbers with inerters. The inerter manages to reduce the frequency of the system, without weakening the structure or increasing the seismic load. At the same time, the effective damping is significantly increased with the KDamper. This way, the dynamic behavior of the system is improved, in terms of absolute accelerations, and simultaneously, the static settlements are retained at any desired level. The design of the vertical seismic absorber is based on engineering criteria, and the excitation input is selected according to the seismic design codes. The dynamic performance of the vertical seismic absorber is also evaluated with real earthquake records, using a realistic displacement-dependent configuration for the realization of the negative stiffness element. Finally, the detuning phenomena are observed and discussed via sensitivity analysis.

地震隔离已被证明是对建筑结构，设备和工业设施进行地震防护的有效技术。现有的大多数隔离系统和技术都与水平地面运动有关，而只有很少的垂直隔离系统。主要原因是由于有关隔离刚度需求的冲突。更具体地说，垂直隔离系统必须具有足够的垂直刚度，以承受隔离物体/系统的重量并将静态垂直挠度保持在合理的范围内。另一方面，隔离的系统还必须具有足够的灵活性以隔离加速度。为了克服这个困难，提出了一种新颖的垂直减震器系统，该系统将负刚度驱动的减震器与惰性气体结合在一起。惰轮设法降低系统的频率，而不会削弱结构或增加地震负荷。同时，使用KDamper可以显着提高有效阻尼。这样，就绝对加速度而言，改善了系统的动态性能，同时，静态沉降保持在任何所需的水平上。立式减震器的设计基于工程标准，并根据抗震设计规范选择激励输入。垂直减震器的动态性能也可以通过真实的地震记录进行评估，并使用与位移有关的实际配置来实现负刚度元素。最后，通过灵敏度分析观察并讨论了失谐现象。