Evaluation of Response Modification Factor of RC Shaft Support of Elevated Tank in Thailand

Abstract

Nowadays, building structures are designed to resist earthquakes in Thailand based on the Seismic resistant building design standards (DPT 1301/1302-61). They determine the response modification factor, R, which is an essential variable in the design of various structural systems but not including the elevated tank structure, especially the reinforced concrete shaft support of elevated tank. There is only R value as a guideline for the analysis of buildings. For example, R values of the ordinary reinforced concrete shear wall equaled to 4. From the study, the R values of elevated tank from the standard construction in Thailand, both 300 cubic meters and 500 cubic meters, which is reinforced concrete shear wall system, were 6.46 and 6.27, respectively. These values are greater than R value that is recommended for reinforced concrete shear wall system in design standards.