Evaluation of Response Modification Factor of Multiple Story Steel Buildings

Abstract

Response modification factor (R) is a significant design parameter of steel structures under seismic loads. Thus, determine the factor benefits the design process. This study aims to evaluate the values of response modification factors of multiple story steel buildings with considering various damping ratios. Different types of steel structures, from 4-to 12-story buildings, with various damping ratios were first analyzed using SAP software. The results from SAP, then, have been used to calculate the response modification factors using existing models. Results indicate that the use of damper increases significantly the response modification factors of steel structures, e.g., the factor of structures with dampers are 22 -110% higher than the structures without dampers. The height of structures and the number of viscous dampers was found to have significant effect on the response modification factor.

Effect of Fixed-Base and Soil Structure Interaction on the Dynamic Responses of Steel Structures

“…In addition, the modal characteristics of the structure are modified by inertial interactions such as the damping factors and the vibrations in the modal frequencies. Simplified analytical and theoretical methods have been used in the literature to study inertial interaction [10][11][12][13]. Laboratory and field test data have been validated by numerical modeling for the analysis of soil-foundation interaction [14,15].…”