TY - GEN

T1 - Methodology for the parametric analysis and seismic design of isolated elevated water tanks

AU - Baquedano, P. A.

AU - Gran, F.

AU - Fernández-Dávila, V. I.

PY - 2006

Y1 - 2006

N2 - This paper describes a methodology of analysis and seismic design for the study of 828 parametric models of reinforced concrete elevated water tanks with seismic isolation in the base. Thus it was possible to estimate the interest responses such as, for example, the fundamental period of vibration, maximum lateral displacement, maximum shear forces and maximum bending moment, through a set of curves of normalized responses whose errors do not exceed 10% for all cases. This continuous special structure similar to an inverted pendulum was discretized using the lumped mass criterion. The modeling was made using uni-dimensional elements considering flexure and shear effects. The support of the tank was partitioned into ten elements and the tank into five elements. The isolation system is conformed by a rigid girder that connects the superstructure (tank and support) with the isolators, which are located in the circular perimeter of the base support. The elastic parameters were grouped in the following order: a) elevated tank: slenderness ratio (HD), diameters ratio (RD), diameter - thickness ratio (DE), water mass - structure mass ratio (RM), b) Isolation system: slenderness ratio (RHa) c) Water: the water-structure interaction effect was considered using Housner's method. The sensitivity analysis of the structural models, allowed us to observe that the maximum moments and the maximum shear forces are equivalent to 50% of the maximum responses obtained in their similar fixed base, and that the relative lateral displacements are lower than 1,2 % which means that the structure moves in the shape of rigid block.

AB - This paper describes a methodology of analysis and seismic design for the study of 828 parametric models of reinforced concrete elevated water tanks with seismic isolation in the base. Thus it was possible to estimate the interest responses such as, for example, the fundamental period of vibration, maximum lateral displacement, maximum shear forces and maximum bending moment, through a set of curves of normalized responses whose errors do not exceed 10% for all cases. This continuous special structure similar to an inverted pendulum was discretized using the lumped mass criterion. The modeling was made using uni-dimensional elements considering flexure and shear effects. The support of the tank was partitioned into ten elements and the tank into five elements. The isolation system is conformed by a rigid girder that connects the superstructure (tank and support) with the isolators, which are located in the circular perimeter of the base support. The elastic parameters were grouped in the following order: a) elevated tank: slenderness ratio (HD), diameters ratio (RD), diameter - thickness ratio (DE), water mass - structure mass ratio (RM), b) Isolation system: slenderness ratio (RHa) c) Water: the water-structure interaction effect was considered using Housner's method. The sensitivity analysis of the structural models, allowed us to observe that the maximum moments and the maximum shear forces are equivalent to 50% of the maximum responses obtained in their similar fixed base, and that the relative lateral displacements are lower than 1,2 % which means that the structure moves in the shape of rigid block.

UR - http://www.scopus.com/inward/record.url?scp=84865853783&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84865853783

SN - 9781615670444

T3 - 8th US National Conference on Earthquake Engineering 2006

SP - 9306

EP - 9315

BT - 8th US National Conference on Earthquake Engineering 2006

T2 - 8th US National Conference on Earthquake Engineering 2006

Y2 - 18 April 2006 through 22 April 2006

ER -