ANALISIS FAKTOR EFISIENSI DAN PERILAKU KELOMPOK TIANG AKIBAT BEBAN LATERAL MENGGUNAKAN METODE FINITE DIFFERENCE DAN METODE ELEMEN HINGGA (ANALYSIS OF THE EFFICIENCY FACTOR AND THE BEHAVIOR OF PILE GROUPS DUE TO LATERAL LOAD USING FINITE DIFFERENCE METHOD AND FINITE ELEMENT METHOD)
Abstract
The lateral loading capacity of a pile group is not the sum of the lateral capacity of each
pile. So, in a pile lateral loading capacity calculation, an efficiency factor or the reduction factor
is needed. This study also analyzes the behavior of pile groups due to lateral load. The behavior of
pile groups is the interaction between the piles and pile group. Factors affecting a pile group one
pile are given lateral load are depending on the pile's position in the group, the distances between
piles, the number of piles and mast head clamp conditions. Lateral load on the mast head causes
deflection of on the pile head and bending moments occur along the pile. This study is conducted
to determine the efficiency factor, deflection and bending moment on the single pile and pile group
3, 6, and 9 with a distance of 4D, 5D and 6D when they receive a static lateral load on wedged
mast head (fixed head).
The calculation of lateral load uses the Broms, Elastic Solutions (Reese and Matlock)
methods and PLAXIS 3D Foundation Version 1.6. Lateral load is given with the loading direction
of the X-axis. The limitation of movement on the pile head is within 6 mm. The study of the
efficiency factor, mast deflection and bending moment factors is conducted using the Finite
Difference method and the finite element method using PLAXIS 3D Foundation Version 1.6.
The lateral efficiency factor based on the allowable deflection, using the Finite Difference
Method of increasing pile distance, the value of the pile group efficiency factor will be enlarged
and close to one which is the efficiency factor of the single pile. Based on the calculation of Finite
Element Method using PLAXIS 3D Foundation Version 1.6 efficiency factor to the pile distance
the greater the distance between the piles in a pile group the greater the efficiency factor and the
efficiency factor to the number of piles the greater the number of piles in a pole group the smaller
the efficiency factor . The results of Finite Difference Method and PLAXIS 3D Foundation Version
1.6 calculation, the greater the distance between piles, the movement of the pile will approach the
single pile. The result of the calculation of PLAXIS 3D Foundation Version 1.6 of the number of
three-pile multiples in the pile group with square and rectangular pile caps will result in the
relative maximum relative moment values in each pile group due to lateral loads based on the
permit deflection. The effect of the number of piles on the behavior of the pile group due to lateral
load variations with the existing pile spacing using the Element Method Up to PLAXIS 3D
Foundation Version 1.6 is linear where the more piles in the pile group the deflection and bending
moment will be smaller. In groups of 3 piles, with a load of 1000 kN to 4000 kN load there was a
deflection increase of 34% - 56% and pile bending moments of 32% - 56%. In groups of 6 piles,
with a load of 1000 kN to 4000 kN load there was a deflection increase of 35% - 48% and pile
bending moments of 34% - 61%. In groups of 9 piles, with a load of 1000 kN to 4,000 kN load
there was a deflection increase of 25% - 40% and pile bending moments of 36% - 58%. The
correlation of the pile deflection with the bending moment is the greater the deflated pile then the
bending moment will also be greater.
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- Civil Engineering [4205]