Variation Of Response With Incident Angle Under
Two Horizontal Correlated Seismic Components
Author(s)
A. M. Athanatopoulou, A. Tsourekas & G. Papamanolis
Abstract
The response variation with the incident angle under two horizontal translational
components of ground motion without the use of the Penzien–Watabe model –
i.e. these components can have any degree of correlation – is investigated. For
this purpose ten R/C buildings are analysed using the linear response history
method under eight earthquake records for incident angle varying from 0 to 180
degrees. The results of the analyses show that the maximum value of a response
quantity can be up to 176% larger than the value produced when the seismic
components are applied along the structural axes.
Keywords: seismic excitation, horizontal components, correlated components,
incident angle, maximum response, response variation.
1 Introduction
Seismic codes require consideration of the two horizontal and the vertical
components of ground motion. When the components are defined along the
principal axes of ground motion they are uncorrelated [9]. Standard practice is to
determine separately the peak responses of the structure due to each component
of ground motion –with the horizontal components applied along the structural
axes- and combine the peak responses according to a directional combination
rule.
In practice the principal axes of ground motion of the design earthquake are
unknown. Hence it is prudent to design for the orientation of the principal axes
that yields the maximum response. Several researches have investigated the
critical incident angle and the corresponding maximum response in the context
of the response spectrum method and using the Penzien–Watabe model,
i.e. assuming the translational components of ground motion uncorrelated
Keywords
seismic excitation, horizontal components, correlated components,
incident angle, maximum response, response variation.
Related Book
Other papers in this volume
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