Through analyzing and researching the potential damages caused by blasting slungshot,blasting vibration,backlash and touchdown quake in collapsing of this building,many preventional measures were taken accordingly which insured the safety of nearby architectures and public service.

The directional blasting of 100-meter reinforced concrete chimney without backlash is introduced.

A structural optimal design methodology of a magneto-rheological(MR) damper for gun recoil application was presented based on electro-magnetic finite element analysis and Bingham plastic flow model.

A brick-structured chimney with a height of 45 meters was successfully demolished without recoil through directional blasting in complicated environment.

A gun recoil magneto-rheological(MR) damper for a gun test application is studied in this paper.

The change of the seat angle affects significantly the tangential force,the efficiency of the force,and action efficiency.

The relations of recoil mass to output force and recoil force was obtained based on the experiments.

In order to effectively reduce recoil force transferred from a type of automatic gun to carriage,it is necessary to set up the buffering device between receiver and cradle.

As an effective way of reducing the recoil force,the key technology of the floating mechanism is how to match properly the relation between floating mechanism configuration parameters and automatic mechanism kinematic parameters.