NEAR- FIELD EARTHQUAKES EFFECT ON HORIZONTAL AND VERTICAL RESPONSE SPECTRA

Strong earthquakes of the past decade have revealed destructive effects of motions in vicinity of faults. Hence, in this paper, characteristics of near field ground motions have been considered in horizontal and vertical directions. In this consideration, the record averages have been compared with Uniform Building Code (1997): International Conference of Building Officials, Structural Design Provisions (UBC97) and European Standard (2001): Design of Structures for Earthquake Resistance (Eurocode 8) spectra in 2 levels. In addition, the ratio of vertical to horizontal spectra has been computed and compared with the assumed value of 2/3 in some code provisions.

کلیدواژه ها:

horizontal spectrum ، vertical spectrum ، nearfield ، forward directivity effect ، filing step ، UBC97 ، Eurocode 8 ، bridge