Developing a Seismic Damage Evaluation Model for Tehran’s Buildings in a GIS Environment
How to Use These Models
To estimate destruction for an individual building, firstly, the earthquake magnitude at the location of building should be calculated by use of attenuation relationships in term of PGA, PGV or PGD. In the second step, by use of building properties, respective fragility curve should be identified and then by use of that curve the probability of excess of destruction from a predefined percentage should be obtained. For example, to calculate the 0-30% destruction probability for a masonry building when the PGA=0.2, by use of figure 1 (which is for masonry building) the probability would be 74%.
Research Attitude
Different efforts have been conducted to develop the mentioned models for Tehran. Japan International Cooperation Agency (JICA, 2000) has developed a fragility curve for Tehran, using available data from Manjil earthquake (1990). Jalalian (2006) has also developed fragility curves for Tehran. These curves are good for masonry buildings however not accurate for other types of building due to data shortage during model development.
With these in mind, it is essential to develop a more proper fragility curves for Tehran. In this research, it is intended to develop a fragility curve for Tehran by adopting the offered fragility curve in Hazus software (Hazus Technical Manual) to Tehran, with respect to the two above mentioned curves. The developed model will then be implemented in GIS environment.
Conclusion
In this paper, the scientific basic applied in seismic destruction of buildings as well as role of GIS in developing an appropriate model for this purpose were studied.
In addition, the method of developing a primary model for damage evaluation of buildings in Tehran, which is still underway, was defined. The primary model is being completed on the basis of the aforementioned method.
More accurate studies to reach a more developed model to replace the primary model will be done in our future study.
References:
- Zare, M., P.-Y. Bard, M. Ghafory-Ashtiany, Attenuation Law for the Strong Motions in Iran, 3rd Int. Conf. on Seismology and Earthquake Engineering (SEE3), Tehran, 1999
- Jalalian, M. (2006). ” Deriving of Empirical Vulnerability Functions for Iran”, a MSc Thesis, University of Technology, Tehran, Iran.
- Hazus99 Technical Manual (1999), Federal Emergency Management Agency, Washington, USA.
- JICA (2000). “The Study on Seismic Microzoning of the Greater Tehran Area in the Islamic Republic of Iran", a report from Center for Earthquake an Environmental Studies of Tehran (CEST) and Japan International Cooperation Agency (JICA), Tehran Municipality, Tehran, Iran.