Bearing capacity of footing on layered soils

مقدم أطروحة جامعية

Sadiq, Umar Sharif

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2004

الملخص الإنجليزي

Geotechnical engineers are familiar with the uncertainties and inaccuracies in analytical methods.

The use of probability theories to assess risk and reliability of designs represents a rational approach and recent contributions have added to the theoretical basis of reliability assessment.

Statistical^ methods can be of great value to the designer since it is possible to express many of the decision uncertainties in term of numerical probabilities.

In this study the probabilistic approach that deals with ultimate bearing capacity for multilayer soil system is introduced with specific condition (continuous footing applied on submerged layered soils).

The uncertainty variables (random variables) that have been studied of three main types ; •Soil properties that include the soil strength parameters of the fiist layer (c1, ɸ1, Y1) and the soil strength parameters of the second layer (c2, ɸ2, Y2) Geometry probkm that includes thickness of the first layer below tooting (h1), width of footing (bw) and depth'of excavation (d).

Actual load (p).

Each random variable was defined by its mean (μ) and standard deviation (σ) and was assumed to have a normal distribution behavior The First Order Second Moment Method (F.O.S.M) was used in this thesis.

The approach is applied to numerical examples for different soils and it was shown that the probability of failure (Pf) is more reliable than traditional factor of safety (F.s) and hence (Pf) is recommended in this thesis to substitute (F.s) in the design of foundation on two layers soil system .

A parametric study is made and the effect of each design paiameter is investigated through four cases which represent most of site conditions.

In general it was found that the actual load is more important than all other parameters while the parameters (c, ɸ) comes in second degree of importance.

It was shown that each parameter defined through reliability index has different effect.

التخصصات الرئيسية

الهندسة المدنية

الموضوعات

• الميكانيكا
• فيزياء التربة
• ميكانيكا التربة

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305761