Research On Effect Of Shear Wall Thickness Variation On Seismic Performance Of Shaft Tower Structure

Well tower is an important industrial structure within the mine floor industrial sites,which is in the critical path connecting the upper and lower mine production processes. Atpresent, more and more well tower structures are using reinforced concrete frame shear wallstructures. Frame shear wall structure is recognized as a better ductility structure, althoughframe shear shaft tower is widely used in mining, but its seismic response characteristicsremains to be studied. This paper studied well tower frame shear wall double symmetricalstructure.In this paper, modeling based on the actual size of the well tower structure SAP2000analysis software, analysis of the seismic response characteristics at different shear wallthicknesses and then analyzed. modal analysis is adopted in linear elastic stage, responsespectrum analysis using pushover analysis of elastic-plastic stage.Four well tower models for modal analysis showed that the increase of the thickness ofthe shear wall in the case of other conditions do not change, which continues to reducevibration period and reduces the magnitude smaller, and the model’s formation stiffness alsoincreased stiffness model type vibration modes increases as the order increases. Linear elasticphase modal response spectrum analysis, the structure of the maximum floor displacement: Xat48.8m, Y at26.6m, indicating the weak parts of the structure under the tower at the site.With the increase in the thickness of the floor, both the shear displacement and angulardisplacement has the layer decreases, indicating shear wall thickness increases with thestrength of the weak parts of the shaft tower structure has been strengthened, and the overallstrength of the shaft tower structure is also increasing. Average load is applied along the Ydirection in pushover analysis, the base shear capacity of four models with shear wallthickness increased shaft tower structure at the same time continue to improve inter-layerfloor displacement and angular displacement shaft tower structure are reduced, the first shaft tower structure appear sequentially plastic hinges time delays, and weak layer is at about26.6meters. With the increase of thickness of shear wall, basal shear capacity of well towerstructure is increase, and floor displacements and inter-story drift of shaft tower structure arereduced.The weak position of shaft tower structure appears in the Y direction at26.6m linearelastic stage and elastic-plastic stage, at the basic and the shear strength of weakest part isconstantly improving with increasing thickness, and the overall strength is improving, whichcoincide with conclusion of response spectrum analysis.