The Effect of the Earthquake Incidence Angle on SeismicDemand of Reinforced Concrete Structures

Because of the uncertainty of the location of the epicenter of the next earthquake, the ground motion records should be applied at any direction relative to the structure which needs to be analyzed. The structural demand produced by Non-Linear Time-History Analyses (NLTHA) varies in function of the incidence angle of the seismic input. This study evaluates the seismic directionality effects by subjecting four three-dimensional reinforced concrete structures to different scaled and un-scaled bi-directional ground motion records oriented along nine incidence angles, whose values are between 0 and 180 degrees, with an increment of 22.5 degrees. The NLTHA performed applying the ground motions along the principal axes underestimate the structural demand prediction, especially when plan-irregular structures are analyzed. The ground motion records generate the highest demand when applied in the most flexible structural direction and a high energy content of the records increases the structural demand corresponding to this direction.

[1]  Enrico Spacone,et al.  FIBRE BEAM–COLUMN MODEL FOR NON‐LINEAR ANALYSIS OF R/C FRAMES: PART I. FORMULATION , 1996 .

[2]  Julio J. Hernández,et al.  Structural Design for Multicomponent Seismic Motion , 2002 .

[3]  Asimina Athanatopoulou,et al.  Critical orientation of three correlated seismic components , 2005 .

[4]  R. Park,et al.  Flexural Members with Confined Concrete , 1971 .

[5]  Joel P. Conte,et al.  Probabilistic seismic response analysis of a 3-D reinforced concrete building , 2013 .

[6]  Julian J. Bommer,et al.  THE USE OF REAL EARTHQUAKE ACCELEROGRAMS AS INPUT TO DYNAMIC ANALYSIS , 2004 .

[7]  Joseph Penzien,et al.  CHARACTERISTICS OF 3-DIMENSIONAL EARTHQUAKE GROUND MOTIONS , 1974 .

[8]  C. Cornell,et al.  Disaggregation of seismic hazard , 1999 .

[9]  Ricardo A. Medina,et al.  Influence of angle of incidence on seismic demands for inelastic single-storey structures subjected to bi-directional ground motions , 2007 .

[10]  Ross B. Corotis,et al.  The variability of deformation demand with ground motion intensity , 2012 .

[11]  Mahmood Hosseini,et al.  STUDYING THE EFFECT OF EARTHQUAKE EXCITATION ANGLE ON THE INTERNAL FORCES OF STEEL BUILDING'S ELEMENTS BY USING NONLINEAR TIME HISTORY ANALYSES , 2008 .

[12]  F. Mollaioli,et al.  ON THE CORRELATION BETWEEN ENERGY AND DISPLACEMENT , 2002 .

[13]  J. Bommer,et al.  Relationships between Median Values and between Aleatory Variabilities for Different Definitions of the Horizontal Component of Motion , 2006 .