1. Seismic analysis and design of
a structure in the UAE
Student Name:
Huda Al-Hayyass
Iman Salem
Nada Bakri Al Naser
Fatima Al-Hosani
Amna Mohamed.
Muna Abdulla
Advisor's Name: Prof. Ahmed Ghobarah

2. Contents: Introduction. Earthquake. Historical Background.
Methodology.
Damages of earthquake.
Gantt chart & Next week plan.
Conclusion and Recommendation.

3. Introduction
UAE is one of the developing countries, and it's famous of buildings, so earth quake will affect seriously in this buildings. In the last few years Earthquakes strike in the UAE as evidenced by the damaging earthquakes near :
Masafi in early 2002,The magnitude 5.1.
Dubai 27/2005 ,The magnitude 6.1.
Problems:
UAE didn't have organization for recording earthquake values, its only uncoordinated efforts.
UAE didn't have Seismic Design Codes.

4. The municipality compulsion to use Seismic Design Codes such as:
New Zealand
British Code
Uniform Building Code
NEHRP
International Building Code
Eurocode 8
Objectives:
Apply earthquake engineering concepts to study, analyze and design a reinforced concrete structure in the UAE .
develop anew special codes for UAE.

5. Emirate's geology:

6. How and why Seismic happen in UAE:

7. How and why Seismic happen in UAE:

8. Earthquake Observations Centers

9. The Earthquake magnitudes were known and recorded in UAE:
Location
Year
unknown
Dubai, Abu-Dhabi
1924
1925
1930
5.1
North Emirates
1994
5.9
1999
Masafi
2001

10. The Earthquake magnitudes were known and recorded in UAE:
Location
Year
4-5.1
Masafi, Dubai, Sharjah, Ajman, Ras Al-Khaima, & Um-
Qwain.
2002
unknown
Ras Al Khaimah
2003
Fujairah
Masafi
2.7
Dibba/Fujerah
2004
6.1
Dubai
2005

11. Comparing the magnitude and effects of earthquakes.
Earthquake Effects
Richter Scale Magnitude
Basically unable to be felt, but is recorded by seismology labs.
Less than 3.5
Usually felt, but causes minimal damage.
Between 3.5 and 5.4
May cause slight damage to well-designed buildings, but can cause significant damage to poorly built structures over a small region.
Between 5.4 and 6.0
Destructive over an area up to 60 miles in diameter
Between 6.1 and 6.9
Considered a major earthquake. Causes serious damage over a larger area.
Between 7.0 and 7.9
Very significant earthquake. Causes serious damage over an area over 100 miles in diameter.
Greater than 8.0

12. Methodology
In order to design and construct a structure in such regions, seismic hazard analysis must be predicted. (By determining the peak ground acceleration [PGA]).
Seismic hazard analysis:
The probability of future seismic loading that the structure is likely to be exposed to during its lifetime.

13. Seismic Hazard Analysis Methods
Deterministic approach:
Used to determine the maximum credible E.Q motion at a given site.
It’s simple and usually used when:
The tectonic features of the region are well defined.
The seismic activity is relatively high.
Probabilistic approach:
Quantifies the uncertainly and take into consideration the probability of E.Q occurrence.
It’s used to predict and forecast the implication of future uncertainly

14. Comparison between the two methods
The probabilistic approach takes into account:
The uncertainties in the level of magnitude of E.Q.
The hypocentral location.
Its recurrence relation and its attenuation relation.
All these points gives more realistic values for E.Q parameters for the probabilistic approach as compared to the deterministic approach.
In our project, the probabilistic approach will be used.

15. Steps of probabilistic seismic hazard analysis
The main steps and parameters of the probabilistic seismic hazard assessment :
Historical and instrumental seismic data.
Seismic source model that based on geological and seismological.
Estimated recurrence relationships and the assessment of the maximum magnitudes.
Attenuation of the strong ground motion.
Recurrence forecasting.

16. Attenuation Relations
There are many factors affects the reduction amount of PGA, which are:
Magnitude of E.Q.
Length of E.Q (period).
Distance of site considered from E.Q hypo central.
Soil characteristics of the site.
Frequency of the signal reaches the building.
Natural frequency of the building.

17. PGA (cm/s2) with a 10% probability of exceedance
975 yrs return period
475 yrs return period

18. Seismic Zoning of UAE Soil conditions. PGA.
Zones Analysis:
Soil conditions.
PGA.
The long time span, the better the seismic hazard assessment.

19. March 2002 Fujirah earthquake

21. Philosophy of Design Process
In designing a regular building subjected to an earthquake, we design for:
Small E.Q [10% probability of exceedance within 475 years period]
Building should not be affected
(No cracks will occur)

22. Philosophy of Design Process, (cont.)
Median E.Q [10% probability of exceedance within 975 years period]
Some cracks may occurred,
But can be repair

23. Philosophy of Design Process, (cont.)
Extreme E.Q [10% probability of exceedance within 1900 years period]
Major damages on the building
But the building will not collapse
or fail. (No People will be killed)

24. Nonlin Program