Research On Multi-stage Vertical Vibration Reduction Of Super High-rise Structure Of Metro Cover Structure

The super-high-rise structure of a subway top cover is used as the research object in this paper,and the vibration control effect of multi-stage vibration reduction measures,as well as the propagation rule of subway vibration wave,are researched using shaking table test and numerical simulation.The following are the key points and conclusions of this paper:Considering the control goal of super-high-rise structure vibration comfort,the subject team came up with three ways to reduce vibrations: a flexible material wrapped around the first pile,a mattress layered under the second structural foundation transfer plate,and foundation isolation measures of the upper cover.For the upper structure’s foundation vibration isolation tests,a 1:30-scale shaking table test model was made.By measuring the subway vibration wave’s excitation,the vibration-isolating effect of the isolation layer and the rule for how vibrations travel along the upper structure floor were studied.After the isolation mount is set,the results show that the peak acceleration response at the top of the isolation layer is somewhat lower than that at the bottom of the isolation layer.The vibration response of different floors in a structure with vibration isolation is lower than in a structure without vibration isolation.Based on the research of foundation vibration isolation test of upper structure and using numerical analysis,the vibration-reducing effects of three damping measures under the action of respectively and the whole structure are studied further.The results show that the vibration-reduction and tension measures around the pile not only limit the internal friction on the side of the pile,but also reduce the risk of tunnel structure settlement and,to that extent,isolate the subway vibration from the pile foundation.After the cushion is put under the transfer plate of the upper structure’s foundation,it has a small impact on damping,but it does have some effect on low-frequency vibration.After the foundation vibration isolation measures are put in place,the upper structure floor’s high-frequency vibrations are greatly reduced,and the middle and low floors have better resonance isolation than the middle and high floors.Compared to a structure that doesn’t isolate vibrations,the upper building’s vibration reaction is much lower when multi-stage initiatives to minimize vibrations are considered.From a spectrum point of view,it has a big effect on reducing high-frequency vibration.