A Building Frame Experimental Study Supported On Piles

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 10 | Oct 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 460
A Building Frame Experimental Study Supported On Piles
Ch. Rajesh1, B. Kesava Rao2
1.M.Tech., Student, Department of Civil Engineering, RVR&JC College of Engineering, Guntur, INDIA
2Assistant Professor, Department of Civil Engineering, RVR&JC College of Engineering, Guntur, INDIA
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Abstract - This study uses the findings of staticverticalload
testing to illustrate the impact of beam on a model building
frame supported by a single pile buried in cohesion soil (red
soil). The impacts of the beam on the buildingframeatcolumn
bases were examined. Thematerialsusedforexperimentaltest
are aluminum specimen with length of 300 mm, 500 mm and
700 mm of diameter 20 mm as pile below the building model
frame along with pile cap of size 60mm×60mm and thickness
of 20mm and hollow rectangular steel specimen of size
50×50mmx700mm whose thickness is 3mm .The interaction
analysis is carried out on the beam, building frame and pile
which are placed on the soil. The response includes the
displacement at the bottom. The effect of the soil-structure
interaction is observed to be significant for the type of
foundation and soil considered in the present study
Key Words: Soil Structure Interaction (SSI), Building
Frame, Piles, Beam and Cohesion soil
1. INTRODUCTION
The study of soil-structure interaction (SSI) is related to
earthquake engineering. It is critical to understand that the
structural response is primarily caused by soil-structure
interaction forces that act on the structure. This is an
example of earthquake stimulation. When comparedtofree-
field ground motion, a committee of engineering research is
only interested in the study of soil-structure interaction
when these forces have a discernible effect on basement
motion. The motion recorded on the soil's surface without
the involvement of the structure is known as free-field
ground motion.
1.1 SSI
It is commonly assumed that SSI is a purely beneficial effect
that can be conveniently ignored for conservative design.
Seismic design code SSI provisions are optional and allow
designers to reduce building design base shear by
considering soil-structure interaction (SSI) as a beneficial
effect. The provisions' main idea is that the soil-structure
system can be replaced with an equivalent fixed-base model
with a longer period and, in most cases, a higher damping
ratio. The majority of design codes employ oversimplified
design spectra that achieve constant acceleration up to a
certain period and then decrease monotonically with period.
Considering soil-structure interaction makes a structure
more flexible,increasingitsnaturalperiodwhencomparedto
a rigidly supported structure. Furthermore, taking into
account the SSI effect raises the system's effective damping
ratio. The smooth idealisation of the designspectrumimplies
a smaller seismic response with increased natural periods
and effective damping ratio due to SSI, which is the main
reason for seismic design codes to reduce the design base
shear when the SSI effect is taken into account. Furthermore,
taking into account the SSI effect raises the system'seffective
damping ratio. The smooth idealisation of the design
spectrum implies a smaller seismic response with increased
natural periodsand effective damping ratio due toSSI,which
is the main reason for seismic design codes to reduce the
design base shear when the SSI effect is taken into account.
1.2 Building frame and Pile
Deformation of the foundation resting on deformablesoils is
caused by the rigidity of the foundation, superstructure,and
soil. Nonetheless, the traditional methodofanalysingframed
structures assumes that bases are either completely rigid or
completely flexible. As a result, interactive analysis is
required to evaluate the response superstructure correctly.
Numerous interactiveanalyseshavebeenconducted.Several
studies have been conducted on this subject. Many numbers
work, and comparative studies on pile foundation can be
found, but there has been little experimentation. Work on
framed analysis was reported for structures supported by
pile foundations in order to account for soil-structure
interaction. A thorough experimental investigation was
carried out in this study. Pile groups on themodel supported
the plane frame with beam. Embedded single piles.
Individual piles embedded in red sand. Thebuildingframe is
subjected to static loads (concentrated loads in the centre).
The study of a building frame supported by a single pile
embedded in red soil has not been reported elsewhere,
according to a review of the literature. As a result of this, the
red soil is collected for the study.
2. STATIC STRUCTURE INTERACTION
The dynamic interaction of structure-soil-structure was
introduced, and the research methods were discussed. A
systematic summary of the history and status of structure-
soil-structure and static interaction research that considers
adjacent structures was proposed as a reference for
researchers based on several documents. Given its
complexity and oversimplification of the model for soil and
structures, this study is still in its early stages, but it should

be continued for its significance. A summary of the most
common major computer programs in this field of study was
attempted. Additionally, the benefits, drawbacks, and
applicability of such programs were discussed. Existing
problems and future research trends in this field were also
investigated. The interaction of soil and structure is
important in the behavior of structures under static or
loading..It has an impact on the behavior of the soil as well as
the response of the pile under load. The analysis iscriticalfor
predicting more accurate structural behavior and improving
structural safety under extreme loading conditions. The
behavior of the soil-pile system is predominantly nonlinear,
which complicates the problem. The soil-pile interaction
effect resists the load in a laterally and axially loaded pile,
which is dependent on soil properties, pile material, pile
diameter, loading type, and ground bed slope. The difficulty
in determining the influencing factors necessitates a
thorough investigation of the soil-structure interaction
problem. With the introduction of powerful computers and
simulation tools such as finite element analysis software,
analysis became easier. A detailed literature review on soil–
structure interaction analysis of laterally loaded and axial
loaded piles.
This study uses the findings of static vertical load
testing to demonstrate the impact of beam stiffness on a
model building frame supported by pile groups immersed in
cohesion soil (red soil). Investigations were conducted into
how the rigidity of the beam affected shears and bending
moments in the building frame as well as displacements at
the base of the columns along the length of pile in the axial
direction.
The properties of the red soil were defined by
conducting sieve analysis, specific gravity, relative density
and direct shear test.
Table -1: Sieve analysis of red soil
Sieve sizes Trail 1 (gm) Trail 2 (gm) Trail 3 (gm)
4.75mm 33.5 35 34
2.36mm 66.5 67.5 65.5
1.18mm 118 124.5 121
600µ 113.5 112 114
300µ 103 99.5 102
150µ 39 39.5 38.5
Pan 23 22.5 24
Soils having particle larger than 0.075mm sizearetermed as
coarse-grained soils.coarse-ghrained soils may be have
boulder, cobble, gravel and sand.the following particle
classificatio names depending an the size of the particle.
Weigh accuratley about 500grams ofoven-driedsoil sample.
Clean the sieves and pan with brush and weigh them up to
0.1 gram accuracy.Arrange the sieves intheincreasingorder
of size from top to bottom as shown in table 1 Keep the
required quantity of soil sample on the topsieveandshakeit
with mechanical sieve shaker for about 5 to 10 minutes care
should be taken tightly fit the lid cover on thetopsieve.After
shaking the soil on the sieve shaker,weigh the soil retained
on each sieve.the sum of the retained soil must tally with
original weight of soil taken. We have done sieve analysis to
to get required size material passing 2mm and reatining
1mm of sieve. Total 3 trails were done and the details were
mentioned in the below along with figure 1(a,b,c,d,e,f,g).
Fig. -1: Sieve analysis of red soil
(f)
(e)
(g)
(a) (b)
(c) (d)

Specific gravity is defined as the weight of soil solid at a
given temperature divided by the weight of an equal volume
of distilled water at that same temperature.
Specific gravity (G) =
Along the conical cap and washer, the pycnometer is
cleaned, dried, and weighed (W1).One-third of the
pycnometer is filled with oven-dried soil collected directly
from desiccators, and the weight is determined using a cap
and washer (W2). The pycnometer is filled halfway with
distilled water, stirred with a glass rod, and then filled to the
brim with more water. The screwcap is weighed after being
filled with water flush through the hole in the conical cap
(W3). The pycnometer is cleaned and filled with distilled
water until the surface of the water is flushed with the screw
cap hole, and then it is weighed (W4). The temperatureofthe
water is recorded. Figure 2(a,b,c,d) contain all of the
pertinent information.
Fig -2: specific gravity
Fig -3: Test setup
A hallow rectangular beam is taken of size length 700mm,
width 50mm and height of 50mm and is placed on the
building frame model below it pile a 30cm pile is embedded
in cohesion soil. Place a hangar at the center of the beam add
weights gradually from lower to higher load along with
hanger place three dial gauges one at center of beam and
remaining 2 dial gauges placed on both sides of pile cap. By
adding load at center of the beam the dial gauge show
deflection values and notedown. And Plotthegraphbetween
load vs deflection. As the loads gradually increases the dial
gauge shows the displacements produced in bothsidesofthe
piles and plot graph for both.
Fig. -4: Beam deflection
(b)
(d)
(a)
(c)

Fig -4: Displacements of pile left (30 cm)
Fig -5: Displacements of pile right (30 cm)
3. CONCLUSIONS
The top displacement of the frame is significantlyaffected by
soil-structure interaction. When the effect of SSI is
considered, displacement increases in the range of 97% -
230% for the conventional analysis, i.e.,fixedbasecondition.
The displacement at the top of the frame decreases as pile
spacing increases. The configuration of the pile group has a
significant impact on displacement. The series arrangement
is more rigid than the parallel arrangement. The diameter
and number of piles in a group with the same arrangement
are critical. Increases in these two parameters increase the
stiffness of the pile group, resulting in a decrease in
displacement.
REFERENCES
[1] C. R. K. Reddy, and T. G. Rao, “Experimental study of a
modeled building frame supported by pile groups
embedded in cohesion less soil,” Interaction and
multiscale mechanics, vol. 4(4), 2011, pp. 321-336.
[2] C. Ravi Kumar Reddy, and T. D. Gunneswara Rao, "Effect
of rigidity of plinth beam on soil interaction of modeled
building frame supported on pile groups," Civil
Engineering Dimension, vol. 16(1), 2014, pp. 8-17.
[3] S. S. Chandrasekaran, A. Boominathan, and G. R.
Dodagoudar. "Group interaction effects on laterally
loaded piles in clay," Journal of geotechnical and
geoenvironmental engineering, vol. 136(4), 2010, pp.
573-582.
[4] K. M.Rollins, K. T. Peterson,andT.J Weaver,“Lateral load
behavior of full-scale pile group in clay,” Journal of
geotechnical and geoenvironmental engineering, vol.
124(6), 1998, pp.468-478.
[5] Srivastava, Varnika, H. S. Chore, and P. A. Dode.
"Interaction of Building Frame with Pile Foundation."
Open Journal of Civil Engineering, vol. 6(2), 2016,
pp.195.

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