Experimental investigation of energy-based seismic response analysis for SDOF steel columns

Abstract

Earthquake Engineering is a eld of engineering which deals with seismic forces and their e ects on structures. Earthquake engineers are responsible for estimating the earthquake risk surrounding structure's region and their appropriate design to make sure that the structure can resist severe consequences of probable future earthquakes. The main purpose of the current study, aims to verify formulation of Energy-Based seismic analysis of the structures by conducting experimental tests and includes four main steps. Firstly, an algorithm which performs Energy-Based seismic analytical analysis for any Single Degree of Freedom (SDOF) a ected by a given earthquake. The algorithm also has the capability of generating input and plastic energy response spectra. Secondly, seismic experimental tests on shake table were performed using SDOF steel box-sectioned columns under dynamic loadings with two earthquake records which have similar Acceleration Response Spectrum (ARS) while their input energy spectra have obvious di erences. The third step includes di erent energy components that were calculated using the data obtained from sensors during tests, including acceleration and displacement responses along with strain data. Finally, the obtained experimental energy components values have been compared with those calculated by the analytic analyses algorithm mainly considering the input energy response spectra. Additionally, to verify the results, modal analyses have been conducted in SAP2000 for all test specimens. Totally twelve tests with elastic behavior were conducted. Six specimens were subjected to the two earthquake records with two di erent scale factors. Analytical and experimental results were compared and found out that they were very close. Thus, experimental veri ed analytical derivations of Energy-Based methodology.