PSHA Study Using EZ-Frisk Software Case Study Baychebaq Dam Site

Hadi Jarahi

doi:10.3844/ajgsp.2017.37.46

Abstract

Awareness of seismicity, is the earliest requirement in seismic design of Dam constructions. This article is devoted to study on Seismotectonic and seismicity and also seismic risk analysis of the Baychebaq reservoir dam. These studies involve detecting seismic sources and assessing seismicity parameters. According to the studies, Peak Ground Acceleration (PGA) is 0.1 gal. This PHA may be related to there activation process of Takhte Soleiman which can produce an event around 6.8 Ms in the distance of 20 km from Baychebaq dam. According to the changes of Uniform Hazard Spectrum (UHS), Spectral acceleration parameter increases from period of 0 (0.03 gal) to a period of 0.175 (0.1 gal) and then reduced slightly. Based on the results, the controlling earthquake has a magnitude of 6.1 and 6.5 Mw at a period of 0 for return periods of 475 and 2475 years.

Highlights

A level of strong ground motion can be taken to account as one of the most effective factors on the feasibility study and economic development of various structures
Baychebaq reservoir dam is located at 47.23 latitude and 36.88 longitudes
Considering Seismic Hazard Deaggregation (SHD), the controlling earthquakes is evaluated for return periods of 475 and 2475years with the Peak Ground Acceleration (PGA) and periods of 0.2, 0.5, 2 and 4 sec (Table 4 and Fig. 8 and 9)

Summary

Introduction

A level of strong ground motion can be taken to account as one of the most effective factors on the feasibility study and economic development of various structures. That’s why the seismicity analyses of project developments have always been emphasized on important structures (i.e. dams, organizations and government agencies). Baychebaq reservoir dam is located at 47.23 latitude and 36.88 longitudes (decimal degrees). The site located in northwest of Iran, Zanjan province, 40km northeast of Mahneshan city. The main aim of this Dam is to controlling the floodwater of the Qalechay River, (one of the leaves of Ghezelozan River). The dam is concrete type and its height is 120 m.

Methodology

Findings

Conclusion