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**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

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**Contents: Introduction. Earthquake. Historical Background.**

Methodology. Damages of earthquake. Gantt chart & Next week plan. Conclusion and Recommendation.

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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.

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**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.

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Emirate's geology:

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**How and why Seismic happen in UAE:**

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**How and why Seismic happen in UAE:**

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**Earthquake Observations Centers**

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**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

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**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

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**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

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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.

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**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

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**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.

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**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.

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**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.

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**PGA (cm/s2) with a 10% probability of exceedance**

975 yrs return period 475 yrs return period

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**Seismic Zoning of UAE Soil conditions. PGA.**

Zones Analysis: Soil conditions. PGA. The long time span, the better the seismic hazard assessment.

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**March 2002 Fujirah earthquake**

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**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)

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**Philosophy of Design Process, (cont.)**

Median E.Q [10% probability of exceedance within 975 years period] Some cracks may occurred, But can be repair

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**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)

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Nonlin Program

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