{"id":3030,"date":"2023-10-12T09:36:10","date_gmt":"2023-10-12T06:36:10","guid":{"rendered":"https:\/\/en.coeng.uobaghdad.edu.iq\/?p=3030"},"modified":"2023-10-12T09:36:10","modified_gmt":"2023-10-12T06:36:10","slug":"examination-of-ph-d-thesis-in-civil-engineeing-department","status":"publish","type":"post","link":"https:\/\/en.coeng.uobaghdad.edu.iq\/?p=3030","title":{"rendered":"Examination of ph.D.thesis in civil Engineeing Department"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]thesis in the Department of Civil Engineering. The title of his research is “Numerical Modeling and Analysis of Pile-Soil Interaction under Earthquake Using the Hypoplasticity Model.” The defense took place on Thursday, September 28, 2023, under the supervision of Dr. Bashra Suhail Zabar.<\/p>\n

The thesis committee included the following members:<\/p>\n

Dr. Amal Abdulghani Hussein (University of Baghdad \/ College of Engineering) – Committee Chair.<\/p>\n

Dr. Amjad Hamad Khalil (University of Baghdad \/ College of Engineering) – Committee Member.<\/p>\n

Dr. Mahmoud Ziyab Ahmed (University of Baghdad \/ College of Engineering) – Committee Member.<\/p>\n

Mr. Amar Abdulhassan Sheikha (University of Baghdad \/ College of Engineering) – Committee Member.<\/p>\n

Dr. Azraa Mohammed Jawad Hassan (University of Kufa \/ College of Engineering) – Committee Member.<\/p>\n

Dr. Bashra Suhail Zabar (University of Baghdad \/ College of Engineering) – Thesis Supervisor.<\/p>\n

 <\/p>\n

The analysis of soil-pile-structure systems subjected to seismic stress using an
\nefficient model (the hypoplasticity model) is the goal of this study. The
\nhypoplasticity constitutive model is implemented using the UMAT subroutine,
\nwhich is then incorporated as a dynamically linked library (DLL) in the PLAXIS 3D
\nfinite element program. This model predicts with accuracy the soil response to
\nvarious soil densities, stress levels, and loading conditions. The software and
\nmodel&#39;s ability to simulate soil-pile interaction was validated with related prior
\nexperiments and numerical modeling results conducted using different
\nconstitutive models.
\nA parametric study was carried out to investigate the importance of the analysis
\nof soil-pile interaction under seismic excitation using a hypoplasticity soil model
\nby considering the impact of soil stratification, soil stiffness, soil type, the
\nfrequency of the input motion, pile spacing (S\/D), and the slenderness ratio (L\/D).
\nSuch analyses are valuable in leading to a better understanding of the details of
\npiled foundations under seismic excitation loads and simplifying and making
\nunderstandable the complex nature of the seismic analysis.
\nThe numerical analysis results exhibited that increasing pile spacing to (S\/D=3 and
\nS\/D=4) compared to basic spacing S\/D=2, increase the settlement of piled
\nfoundation system embedded in homogenous dry loose sandy soil by 13% and 22<\/p>\n

%, whereas, increasing pile spacing, reveal that a less significant vertical response
\nwas observed in the case of stratified soil (three layers) as compared to the cases
\nof homogenous (one layer) and stratified soil (two layers) under the impact of
\nstrong motion (Kobe,0.82g). The numerical analysis, also exhibited that an
\nincrease in spacing among piles to (S\/D=3 and S\/D=4) compared to the basic
\nspacing S\/D=2, increases the horizontal displacement of piled foundation
\nembedded in saturated loose sandy soil by (34 and 54) % and (3 and 5) % for Kobe
\nand Upland earthquakes motion respectively.
\nThe effect of earthquake intensity and duration on liquefaction potential in terms
\nof pore water pressure ratio has appeared more prominent in strong motion
\nKobe, where the soil has exhibited initial liquefaction and pore water pressure
\nratio ranges between (1.22 and 1.48) which exceeds the value of 1 for different
\npile lengths and spacing. On the other hand, in the Upland earthquake, the
\noccurrence of initial liquefaction seems unclear since the average maximum pore
\npressure ratio, ru, ranges between (0.67 and 0.77).[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_gallery interval=”3″ images=”3031″ img_size=”large”][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text]thesis in the Department of Civil Engineering. 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