This research includes a numerical study using Finite Element Method aims to
evaluate the ability and accuracy of using Non-destructive Impact Response Method in the
assessment of length and cross-sections of intact concrete pile (not deformed) in
both time
and frequency domains. Therefore, an appropriate numerical model depends on the
modeling of both impact force (impulsive load) and distributing medium (pile + soil) and
insert them in computing software ABAQUS was carried out. The numerical model was
verified corresponding to field measures obtained from literature review and the results
showed good agreement between measures and numerical results. Furthermore, the model
was applied on a typical example in order to study vibration distribution in the pile due to
impulsive load applied on pile top. Mechanical response curve of intact pile was obtained.
Then, both of length and cross-section area of the pile were determined. Finally,
parametrical study of most important factors (stiffness of soil surrounding the pile and
length of pile embedded in the soil) effect on vibration distribution resulted from impulsive
load applied on pile top. The parametrical study was carried out in two domains; first one
was time domain depending on the direct analysis of particle displacement and velocity
and the second was frequency domain depending on analysis of pile mechanical response
curve. The results of this research enables to use the proposed numerical model to
numerically obtain the time history of particle displacement and velocity in addition to the
curve of mechanical response computed in the pile top and forms reference diagrams
which is used later to compare with similar diagrams resulted from field test of executed
piles. As a result, pile integrity test and detecting of defects in the piles if any. In addition,
the limits of the use of both analysis methods adapted in research and choose the best
between them according to the case study.
طريقة العناصر المنتهية
Finite element method
اختبار سلامة الأوتاد
تجارب الصدم غير المخربة
السجلات الزمنية للإهتزازات
تابع قابلية الحركة
منحني الإستجابة الميكانيكية للوتد
المجالين الزمني و الترددي
Pile Integrity Test
impulsive load
nondestructive impact tests
vibration time history
mobility function
pile mechanical response curve
time and frequency domains
ABAQUS
المزيد..