MECHANICAL PROPERTIES OF ANTI-COLLISION X-TYPE DAMPER AND A NEW STATION COLUMN WITH ENERGY DISSIPATION AND COLLISION REDUCTION FUNCTIONS

An effective anti-collision device is important for the station structure column which is frequently subjected to collision. A new type of station column with collision reduction and energy dissipation functions is proposed to ensure the normal use of the structure while achieving the optimal energy dissipation capacity. LS-DYNA is used to analyze the anti-collision performance of the new energy dissipation anti-collision design of the structural column of high-speed railway station, and the main energy dissipation elements, anti-collision X-type damper and aluminum foam, are studied. The numerical simulation was carried out based on the existing classical tests, including unidirectional quasi-static loading test of steel plate, impact test of steel reinforced concrete and impact test of aluminum foam-filled thin-walled structure. The analysis results show that the numerical model established in this paper can simulate the impact force and deformation development during the test well. The numerical models of the anti-collision X-type damper and the new type of station column with energy dissipation and collision reduction functions were established to optimize the cross section of the single anti-collision X-type damper to achieve the best energy consumption. The energy absorption characteristics of the new type station column under different factors and the influence of the additional aluminum foam on the energy absorption of the new type of station column were investigated. The results show that when the anti-impact X-type damper reaches the optimal energy consumption, the damper absorbs 97% of the impact energy in the new type station column under the impact load, while only partial concrete cracks appear in the internal structure column. The energy absorption distribution of the new type station column with aluminum foam is more reasonable and the energy absorption is greatly improved, but the plastic strain of the structural column also increases accordingly. On the whole, the new type of station column with energy dissipation and collision reduction functions has good energy absorption capacity, which ensures the safety of the structural column.