—The objectives of structural seismic design against various seismic risk levels (weak, moderate, severe and maximum credible earthquakes) are different. However in seismic design codes, only the design base earthquake ground motion (severe earthquake) is usually proposed. This research attempts to determine conversion coefficients of design base earthquake ground motion (10% probability of occurrence) to other earthquake acceleration levels (2%, 5%, 20%, 50% and 64%). For this purpose, two susceptible areas of Sari (Elburz zone in North of Iran) and Fereidoonshahr (Zagros zone in west part of Iran) were chosen and their design accelerations relevant to the various seismic levels were determined. Major fault systems of the sites were reviewed and modeled using suiTable attenuation parameters. The conversion coefficients are (0.2, 0.28, 0.64, 1.51 & 2.41) and (0.36, 0.43, 0.74, 1.33 & 1.88) for Sari and Fereidoonshahr, respectively.
—Seismic risk analysis, seismic factors, maximum horizontal acceleration, Seismic risk levels, Sari, Fereidoonshahr.
The authors are with Shahid Rajaee Teacher Training University, Faculty of civil engineering, Tehran, Iran (e-mail: email@example.com).
Cite: Mussa Mahmoudi and Shahram Seyedi, "Evaluation of Conversion Coefficients of Design Base Acceleration to Accelerations of Other Seismic Risk Levels," International Journal of Engineering and Technology vol. 9, no. 3, pp. 216-221, 2017.