Seismic Risk Assessment of Reinforced Concrete Frames at Al-Najaf City-Iraq Using Geotechnical Parameters

The angle of internal friction value (φ) is used to describe the soil resistance to shear failure. It is estimated experimentally either from Direct Shear Test or Triaxial Stress Tests. Because of the high cost needed for conducting field tests, it has become essential to find alternative and practical methods to predict soil characteristics for non-spatial data areas. The objective of this study is to specify the best interpolation method to predict the angle of internal friction and use it to produce geotechnical maps for parts of An-Najaf province-Iraq; these parts are the city centre An-Najaf and Kufa city. Furthermore, the study describes the strength and type of soil strata. The results show that the Local Polynomial Interpolation (LPI) is the ultimate and the most significant method to interpolate the angle of internal friction. Moreover, the angle of internal friction φ values is ringing between (20-46) degrees, which represent medium to dense soil resistance to shear, while the mean values of φ ranged between 34.3 - 36.18 and represent good resistance to shear failure. This indicates that the Density of Sand is medium to dense, and N60 values range from 10-50. This kind of map would ease the engineers and decision-makers to decide the suitability of the construction site to carry loads, and the selection the foundation type. The benefits also extend to selecting urban expansion alternatives and for the delimitation of future trends for land-use-development processes in the metropolitan area of An-Najaf city, mainly at local and regional scales.

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Geotechnical Maps for Angle of Internal Friction of An-Najaf Soil-Iraq Using GIS

Al-Mamoori

Kareem

Al-Maliki³

et al. 2021

ejuow

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Reliability Analysis of Anchored Geotechnical Structures for the Design Limit States

Al-Mamoori

Al-Maliki²,

El-Tawel

2020

ejuow

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Reliability has been considered of magnificent importance in engineering design specially in geotechnical engineering due to the unpredictable conditions of soil layers. It is essential to establish well- designed failure modes that could guarantee safety and durability of the proposed structure. This study aims to suggest a reliability analyses procedure for retaining walls by the mean of a reliability index β using the specifications of AASHTO Bridge Design 2002, Eurocode 7, and DIN EN 1993-5 norms. Two failure modes; Tensile failure of tendon (G1) and Failure by bending (G2) were studied and compared by using equation of the Design Limit State (DLS) and by taking some basic geotechnical parameters as Random Variables RV. The analyses demonstrated that the reliability index β and probability of failure Pf are the most important parameter in the reliability analysis. Also, the suitable height (H) for the retaining structure (for all angles ϴ) equals to 6 m and the most critical angle is ϴ= 45º to prevent the failure by tensile of tendon. While the bending failure reliability analysis shows that all heights of retaining structure are suitable. After comparing the two cases it was found that (G1) is more dangerous than (G2).

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Seismic Risk Assessment of Reinforced Concrete Frames at Al-Najaf City-Iraq Using Geotechnical Parameters

Cited by 2 publications

References 20 publications

Geotechnical Maps for Angle of Internal Friction of An-Najaf Soil-Iraq Using GIS

Geotechnical Maps for Angle of Internal Friction of An-Najaf Soil-Iraq Using GIS

Reliability Analysis of Anchored Geotechnical Structures for the Design Limit States

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