Abstract
Abstract. The present paper investigates the influence of the orientation of recorded horizontal ground motion components on the longitudinal reinforcement of R/C frame elements within the context of linear response history analysis. For this purpose, three single-story buildings are analyzed and designed for 13 recorded bi-directional ground motions applied along the horizontal structural axes. The analysis and design is performed for several orientations of the recording angle of the horizontal seismic components. For each orientation the longitudinal reinforcement at all critical cross sections is calculated using four methods of selecting the set of internal forces needed to compute the required reinforcement. The results show that the reinforcement calculated by three of the applied methods is significantly affected by the orientation of the recording angle of ground motion, while the fourth one leads to results which are independent of the orientation of the recording angle.
Highlights
Modern seismic codes (ASCE 41-06, EAK 2003, FEMA 356, FEMA P-750) suggest linear time history analysis as one of the methods that can be used for the seismic analysis and design of R/C structures
The purpose of the present paper is to investigate the influence of the orientation of recorded horizontal ground motion components on the longitudinal reinforcement of R/C frame elements, within the framework of linear response history analysis
The influence of the orientation of recorded horizontal ground motion components on reinforcement of R/C frame elements has been investigated within the framework of linear response history analysis
Summary
Modern seismic codes (ASCE 41-06, EAK 2003, FEMA 356, FEMA P-750) suggest linear time history analysis as one of the methods that can be used for the seismic analysis and design of R/C structures According to this method, a spatial model of the structure is analyzed using simultaneously imposed consistent pairs of earthquake records along the two horizontal structural axes (with a few exceptions, the vertical component of the ground motion is allowed to be ignored as its influence on seismic response is considered negligible). It has been shown (Kostinakis et al, 2009) that the structural response (i.e. axial stress at columns, bending moments at beams) is strongly affected by the recording angle of the ground motion (i.e. the orientation of the recording instrument) and the recording angle that yields the maximum response does not coincide with the orientation the accelerograms have recorded if the structural response is computed for accelerograms applied along the structural axes
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