Analysis of interaction inside the pile group subjected to arbitrary horizontal loading
Analiza interakcije šipova u grupi opterećenoj horizontalnim opterećenjem proizvoljnog pravca
Author
Marjanović, MilošMentor
Vukićević, MirjanaCommittee members
König, DiethardJocković, Sanja
Lelović, Selimir
Santrač, Petar B.
Metadata
Show full item recordAbstract
The analysis of pile groups subjected to horizontal loading in one of two orthogonal directions is
a common problem in geotechnical engineering. However, the above analysis should sometimes
be extended with the additional cases of horizontal loading, in arbitrary direction. Although the
full scale experiments can provide the best insight into the above problem, they are expensive
and therefore not feasible solution. Instead, numerical (i.e. finite element) analysis usually
remains the ultimate tool for large scope studies.
The main objective of this research is the improvement of the analysis methodology of pile
group for the case of arbitrary static horizontal loading. Its influence is investigated numerically
to check for the existence of the "critical" pile group configurations and soil conditions, that
may lead to the failure of the foundation structure and superstructure itself.
To reach the above objective, apriori sensitivity analysis of the considered problem and
ide...ntification of the main problem parameters are conducted in the first phase. After that, series
of complex 3D numerical models for laterally loaded pile group analysis have been generated
using PLAXIS 3D. Model validation is done by the back-calculation of available experimental
results. Parametric study of pile groups with various configurations under arbitrary horizontal
loading is performed, with an emphasis on pile force distribution, bending response and pile
group efficiency.
Modelling and simulation processes and the optimization of the calculation time were improved using the originally developed codes in Python. The use of multiple computers was
allowed by using the author’s scripts developed within the thesis. The above research resulted
in thousands of numerical simulations, whose findings provided the improved design methodology of pile groups under arbitrary static horizontal loading.
Analiza ˇsipova u grupi izloˇzenoj horizontalnom optere´cenju u nekom od dva ortogonalna pravca
je uobiˇcajen problem u geotehnici. Medjutim, navedena analiza ponekad se mora proˇsiriti dodatnim sluˇcajevima horizontalnog optere´cenja, u proizvoljnom pravcu. Iako eksperimenti na
realnim konstrukcijama mogu pruˇziti najbolji uvid u navedeni problem, oni predstavljaju skupo
(i samim tim neizvodljivo) reˇsenje. Umesto toga, numeriˇcka analiza (npr. primenom metoda
konaˇcnih elemenata) obiˇcno postaje primarni alat za studije velikog obima.
Glavni cilj ovog istraˇzivanja je poboljˇsanje metodologije za analizu grupe ˇsipova za sluˇcaj
proizvoljnog statiˇckog horizontalnog optere´cenja. Njegov uticaj je razmatran numeriˇcki kako
bi se utvrdilo postojanje "kritiˇcne" konfiguracije ˇsipova u grupi i uslova tla, koja moˇze dovesti
do loma temeljne konstrukcije i samog objekta.
Radi ostvarenja gore navedenog cilja, u prvoj fazi sprovedena je uvodna analiza osetljivosti
razmatranog pro...blema i identifikacija glavnih parametara problema. Nakon toga, generisane
su serije sloˇzenih 3D numeriˇckih modela za analizu boˇcno optere´cenih grupa ˇsipova u PLAXIS
3D. Validacija modela izvrˇsena je povratnim proraˇcunom na osnovu dostupnih eksperimentalnih rezultata. Sprovedena je parametarska studija boˇcno optere´cenih grupa ˇsipova razliˇcitih
konfiguracija, sa akcentom na raspodelu sila u ˇsipu, odgovor ˇsipa pri savijanju i efikasnost grupe
ˇsipova.
Postupci modeliranja i simulacije, kao i optimizacija vremena proraˇcuna, poboljˇsani su primenom originalnih programa u Python-u. Upotreba viˇse raˇcunara za proraˇcun omogu´cena je
primenom autorovih programa razvijenih u okviru ove teze. Navedeno istraˇzivanje rezultovalo je u hiljadama numeriˇckih simulacija, ˇciji su rezultati doveli do poboljˇsanja metodologije
proraˇcuna ˇsipova u grupi usled proizvoljnog statiˇckog horizontalnog optere´cenja.
Faculty:
Универзитет у Београду, Грађевински факултетDate:
30-09-2020Projects:
- Towards development of sustainable cities: influence of traffic induced vibrations on buildings and humans (RS-MESTD-Technological Development (TD or TR)-36046)