Vibration Control Of The Building Structures With TLCD Under Explosive Load

At present,the dynamic loads acting on the structure normally include wind load,horizontal earthquake,snow load and vertical earthquake in the research on structural dynamics.When it comes to the explosion loading acting on the structure,there are few researches on the vibration reduction of the structure because of damping of the vibration control system.Nowadays,explosions and terrorist attacks in cities take place from time to time,leaving buildings in the city damaged and major casualties and property losses.To this end,it is imperative to study the anti-explosion and explosion-proof system of the building.Against the background,the author plans to make a research on the vibration control performance of TLCD under action of explosion loading by the vibration control system,the tuned liquid column damper(TLCD),which is significant for damage reduction of building due to explosion loading.Owing to simple installation,low cost,and serving as the spare water tank for the secondary disaster,TLCD is used to comprehensively analyze the dynamic response of the structure with TLCD on the top under action of the explosion loading.Details are as follow:(1)Through the introduction of the explosion phenomenon,the generation and propagation of the explosion waveform,the related characteristics and laws of the explosion shock wave,and the dynamic response and action characteristics of the structure,it is drew some conclusions that the dynamics of the structure under the explosion loading is characterized by powerful strain and pressure as well as rapid strain.In general,such problems are solved by numerical simulation software and the counterpart numerical analysis.Therefore,the AUTODYN,the nonlinear finite element software was applied to solve the interaction between the explosion shock wave and the buildings.(2)Based on the finite element numerical analysis software AUTO-DYN,the concrete constitutive model and a finite element model with the variables of the distance of starting point and the center of the front blast and the explosive equivalent.With the merits of the fluid-solid coupling of software,the author calculated the interaction between the explosion shock wave and the concrete slab of building,and extracted the data of the acceleration-time curve of the explosion shock wave.(3)The paper showed in detail the working principle and related parameters of the tuned liquid column damper(TLCD),and taking a single degree of freedom system and a multi-degree of freedom system with five-layer structure as examples,TLCD was placed at the top center of the structure,the numerical simulation of the explosion shock loading mentioned above as an external disturbance was applied to the structure to analyze the displacement response of each layer and the passive control force response from TLCD.The results indicate that if the structure is installed with the passive tuning liquid column damper on the top layer,its horizontal vibration can be controlled effectively when it is impacted by the explosive shock wave loading.However,due to different loadings,the selection of explosive equivalent will have an effect on the TLCD damping system.(4)Taking 12-layer regular symmetric structure with TLCD on the top layer as the simulation object,and to control the structure,the semi-active control was used.The explosion loading obtained by the numerical simulation served as the external disturbance to compare with the dynamic response by the passive control.We find that under action of the explosion loading,the semi-active TLCD takes advantages over the passive control in effect.After comparison of the displacement response of each layer of the structure,the damping rate of semi-active control system can be increased by 58.14%on the basis of that of the passive control.So the semi-active TLCD control has clear benefits.(5)The paper introduced working principles and parameter selection of a new electromagnetic inertial mass damper(EIMD),which was combined with TLCD owing to its good vibration control performance and small volume to make full use of advantages of each damper.In this paper,the motion equation of the TLCD-EIMD control system was deduced.The system was applied to a 12-layer structure to play a role.The explosion shock loading was used to analyze the dynamic response when controlled in passive control-passive control and semi-active control-passive control.We can draw some conclusions that the mixing control method is more practical,and the semi-active-passive control has more advantages in the steady-state region after the acceleration of the peak by the explosion loading Gaussian.