Response Modification Factor of Shaft Supported Concrete Elevated Water Tanks

The purpose of this paper is determination of response modification factor of shaft supported concrete elevated water tanks using nonlinear static (pushover) and nonlinear dynamic analysis. At First, using incremental nonlinear time history analysis, the seismic capacity curve is obtained and structural response modification factor has been computed. Then response modification factor is computed using pushover analysis with several load patterns. Shear effect on structural behavior is evaluated using the new procedure. Finally, using the proposed analytical procedure, the response modification factor is calculated. In the analytical method the effects of, type of loading, plastic hinge in shaft and effect of stiffness variability in height of shaft is considered. The result represents the validity of the proposed analytical procedure.