Analytical Study of Multistoried RCC Building with Various Bracing Systems on Seismic Response Control using Pushover Analysis Method

International Journal of Trend in Scientific Research and Development (IJTSRD)

Volume 4 Issue 6, September-October 2020 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470

@ IJTSRD | Unique Paper ID – IJTSRD35815 | Volume – 4 | Issue – 6 | September-October 2020 Page 1827

Analytical Study of Multistoried RCC Building with

Various Bracing Systems on Seismic Response

Control using Pushover Analysis Method

Shubham Mathur1, Prof. A. K. Jha2

1Research Scholar, 2Associate Professor, 1,2Department of Civil Engineering, Lakshmi Narain College of Technology, Bhopal, Madhya Pradesh, India

ABSTRACT

The seismic conduct of multi-celebrated structure outline during a tremor

movement relies on the dissemination of solidarity, mass and solidness in both

level and vertical planes. Supporting framework is only the parallel power

opposing framework. Tremor instigates sidelong powers on to the parent

components of building. Sections are the essential horizontal burden opposing

component of any multi-story. These sections alone can't counter the assault

of quake hence propping individuals were presented inside the casings of

multi-story to rise the horizontal solidness of the important structure. The

sidelong power on segments is communicated to supports through bar section

joints pivotally. Propping individuals plunges the horizontal avoidance of the

structure by clasping and yielding during hub pressure and strain separately.

Supports can be introduced inside casings in different setups like corner to

corner, X, V (chevron), rearranged V and K. This work shows that the

examination seismic execution and conduct of building outline with and

without vertical anomaly regarding boundary base shear, story relocation,

story float, , otherworldly quickening and unearthly dislodging. Five sorts of

math are taken for present investigation one standard structure edge and four

structure outlines with variety in level of vertical abnormalities. All structure

outlines are dissected by utilizing plan and examination programming ETABS

and plan according to IS 456-2000, IS 800-2007, IS 1893-2002 and 2005 for

Part 4, IS 808-1989, IS 13920-1993 and SP-16

KEYWORDS: vertical geometric irregularity, story drift, base shear, lateral

displacement, spectral acceleration, spectral displacement

How to cite this paper: Shubham Mathur

| Prof. A. K. Jha "Analytical Study of

Multistoried RCC Building with Various

Bracing Systems on Seismic Response

Control using Pushover Analysis Method"

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International Journal

of Trend in Scientific

Research and

Development (ijtsrd),

ISSN: 2456-6470,

Volume-4 | Issue-6,

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1. INTRODUCTION

The cutting edge basic defensive framework is sorted into

three significant classifications: Seismic Isolation System,

Passive Energy Dissipation Devices and Semi Active and

Active Energy Dissipation Devices. These energy dispersal

gadgets When gets introduced inside any structure abridges

reaction because of the seismicity of quake ground

movement. Every one of these gadgets have their focal points

and inconveniences yet end up being viable in improving

reaction of structure.[22]

Propping framework is only the horizontal power opposing

framework. Quake incites sidelong powers on to the parent

components of building. Sections are the essential horizontal

burden opposing component of any multi-story. These

sections alone can't counter the assault of quake accordingly

supporting individuals were presented inside the casings of

multi-story to climb the parallel firmness of the important

structure. The parallel power on sections is communicated

to supports through shaft segment joints pivotally.

Supporting individuals slips the horizontal avoidance of the

structure by clasping and yielding during hub pressure and

strain separately. Supports can be introduced inside edges in

different designs like corner to corner, X, V (chevron),

altered V and K.

The essential prerequisite of people on planet earth is food,

dress and sanctuary. Ancient people used to live on trees yet

consistently they began building up the asylums for security

against regular catastrophes like downpours, cold and so on

and furthermore from assault against wild creatures. Before

long people rew in information and they began living

respectively, shaping networks to guarantee extra security

and man turned into a social creature. Presently these

networks created and began detonating shaping towns

which later on changed into urban areas and turned into the

business places of a locale. Before long inside these business

places, land for level extension got wiped out. The social

creature began extending vertically developing multi-

celebrated structures. These multi-celebrated structure were

powerless against normal risks like tremor which was

perilous for the occupants. With the progression in designing

practices, analysts created frameworks which decreased the

impacts of seismicity on the designed structures. One such

advancement which is added to the structures is propping

framework.

RESEARCH OBJECTIVE

A. Study the effect of bracing as metallic damper through

Non Linear Dynamic Time History Analysis.

IJTSRD35815

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470


B. To study the response of building with and without

bracing system.

C. To verify whether the passive energy dissipation used

2. LITERATURE REVIEW

Montuori R. et al. 2018 [25] expected to explore the impact

of the supporting plan on the seismic exhibitions of Moment

Resisting Frames-Eccentrically Braced Frames (MRF-EBF)

double frameworks, planned by two plan draws near: the

first is the Theory of Plastic Mechanism Control (TPMC)

while the subsequent one depends on Euro code 8 (EC8)

plan arrangements. Despite the fact that TPMC configuration

approach isn't presented in current seismic codes, it has

procured the standing of being a vigorous plan approach due

to its solid hypothetical foundation, in light of the kinematic

hypothesis of plastic breakdown reached out to the

breakdown system balance bend to guarantee a breakdown

instrument of worldwide sort. On the other hand, the plan

approach dependent on EC8 advances the use of the alleged

pillar segment chain of command standard which is

generally ready to keep away from delicate story

instruments yet doesn't guarantee the yielding of the

apparent multitude of dissipative zones, in light of the fact

that a breakdown system of worldwide sort is seldom

accomplished. Their fundamental motivation behind work is

to analyze, given the previously mentioned plan draws near,

the diverse seismic exhibitions coming about because of the

utilization of the four distinctive propping plan proposed by

codes. Therefore, 5 sound structures with 4, 6 and 8 story's

have been inspected considering four supporting plans

giving an all-out number of 12 basic plans investigated. The

seismic exhibitions have been assessed by methods for

Incremental Dynamic Analyses (IDA) completed until the

accomplishment of auxiliary breakdown and rehashed for a

bunch of ten quake ground movement. Structures whose

supports are masterminded by the reversed Y conspire have

driven in all cases to the best seismic exhibitions; both on

account of structures planned by TPMC and if there should

arise an occurrence of EC8 configuration approach,

autonomously of the quantity of storey's. In examination

with the transformed Y-conspire, the ghostly speeding up

prompting the breakdown lessens on normal of about 10%,

20% and 35% if there should arise an occurrence of K-plot, D

plan and V-plot, separately. Specifically, if there should be an

occurrence of structures planned by TPMC the outcomes got

show that V-conspire structures consistently display the

most noticeably awful exhibitions autonomously of the

quantity of stories.

M. S. Speicher et al. 2019 [26] Developed a shape memory

compound (SMA) based explained quadrilateral (AQ)

supporting framework and tentatively tried for seismic

opposing applications. Framework gives both reappearing

and damping in a versatile plan. Driven by SMA's novel

capacity to recoup strains of up to around 8% through

dissemination less stage change, the foundation of the

propping proposed thus is the capacity to change the energy

dispersal in a returning hysteretic circle using an AQ game

plan. The verbalized quadrilateral plan gives an adaptable,

reconfigurable, advantageous methods for joining nickel-

titanium (NiTi) wires and energy dispersing components.

This setup makes a framework with a customizable measure

of re-focusing and damping, which might be utilized in a

wide assortment of new and existing structures. For these

model tests, NiTi wire groups were joined with long C-

molded dampers to make a framework with a decent

equilibrium of returning and energy dissemination. The

framework was exposed to cyclic stacking to evaluate the

conduct. The framework looked after quality, malleability,

and returning in the wake of being cycled to 2% float, which

is a commonplace greatest in basic frameworks if non-basic

components are to be saved. An investigative contextual

analysis exhibited that shape memory composite

frameworks will in general convey the distortion all the

more uniformly over the tallness of the structure contrasted

with conventional frameworks, which is an alluring seismic

presentation trademark. It is imagined that, by utilizing a

similar essential supporting arrangement, a wide scope of

power disfigurement reactions can be available to an

architect.

METHODOLOGY

Step1: Modeling of Building Frame

Step 2: Analysis

Each type of frame is analyzed separately by using push over

analysis method and time history analysis method by using

STAB 2000.

Step 3: Comparison of results

A. The result acting is compare in term of theory

displacement, theory drift shear force, bending moment

etc.

B. Review the existing literature.

C. Selection of model for the case study.

D. Modeling the selected structures in different seismic

zones 4.

E. Non Linear analysis of the selected structure model and

a comparative study on the results obtained from the

analysis.

F. Finally compare the result and observation

NEED OF STUDY

A. Normal building is not stable in earthquake forces.

B. Bracing system is more effective then metallic damper.

Modeling of Building Frame

Metallic braces is the easiest and simplest way of reducing

response of building which gave rise to five models for the

analysis

A. Model In - G7RCFWOBS : G+7 storey Reinforced

Concrete Frame Without Bracing System

B. Model II - G7RCFWIVBS: G+ 7 storey Reinforced

Concrete Frame with IV Bracing System.

C. Model III - G7RCFWXBS: G+ 7 storey Reinforced

Concrete Frame with X Bracing System.

D. Model IV - G7RCFWVBS: G+ 7 storey Reinforced

Concrete Frame with V Bracing System.

E. Model V- G7RCFWEBS : G+ 7 storey Reinforced Concrete

Frame with Eccentric Bracing System

Model I is bare frame model. Model II, III and IV include

inverted V (IV), X, V and Eccentric Braced Frame

configuration of concentric bracing system. This system of

bracing is used because eccentric bracing systems consist of

a link element that undergoes inelastic deformation for

energy dissipation. This link is possibly beam element of

frame structure which is more suitable for steel structures

and not for reinforced concrete structures.



Figure 1:-D SAP2000 Modeled Building

The above figure 2 shows G +7 Simple Building model In Sap2000. With beam size 300 X 400 mm and column size 400 X 500

mm this reinforced concrete building having M20 grade of Concrete and Fe415 high density steel. To study the response of

building with and without bracing system.

Figure 2: Sectional Properties of Beam

The above figure 3 shows Simple Beam cross section. With beam size 300 X 400 mm this reinforced concrete building having

M20 grade of Concrete and Fe415 high density steel.

Figure 3: Sectional Properties of Column



The above figure4.4 shows Simple Column cross section. With Column size 400 X 500 mm this reinforced concrete building

having M20 grade of Concrete and Fe415 high density steel.

Assumed Data for Models

Building = G + 7 Storey

Slab Thickness = 120 mm

Live Load = 3 kN/m2

Floor Finish = 1 kN/m2

Concrete Grade = M20

Concrete Density = 25 kN/m3

Steel Grade = Fe415

Steel Density = 7850 kN/m3

Earthquake Used = North Ridge, Imperial Valley, Kern & North Ridge

DESIGN OF EXPERIMENTAL SET-UP & INSTRUMENTATION

SAP2000 models for bracings:

3-D and elevation view five models created are depicted in Figure 4.

Figure 4: 3-D and Elevation View of Bare Frame Structure

The above figure7.1 shows G+7 Simple Building model In Sap2000. With beam size 300 X 400 mm and column size 400 X 500

mm this reinforced concrete building having M20 grade of Concrete and Fe415 high density steel. This model noted as bare

frame for further notification. This modeled noted as G+ 7 storey’s Reinforced Concrete Frame without Bracing System

(G7RCFWOBS)

ANALYSIS OF RESULTS

Table compares the effect of bracing on displacement of each storey with bare frame for earthquake of four different

intensities.

Table: 1. Displacements occurred at various stories with different patterns of bracing for Imperial Valley Time

History

Displacements (mm)

Earthquake Time

History

Storey

No.

Bare

Frame

EB Brace

Frame

IV Brace

Frame

X Brace

Frame

V Brace

Frame

Imperial Valley

1 0.0 0.0 0.0 0.0 0.0

2 44.0 28.6 15.6 14.1 27.3

3 113.9 68.8 38.9 35.2 67.1

4 183.7 109.9 63.0 58.6 107.6

5 245.2 149.7 86.2 82.9 146.3

6 299.4 185.8 107.4 106.6 181.3

7 343.7 215.9 125.5 128.3 211.0

8 375.7 238.8 139.6 146.9 234.2



Figure 5: Displacement comparison for bare frame and braced frame model for Imperial Valley earthquake

A comparison is made between shear force values of bare frame and different configuration of bracing utilized for four different

ground motion in Table 2. It becomes very essential to monitor the shear force magnitude in to justify whether braced element

not only reduce storey drift and displacement but also lower the level of demands on the lateral force resisting element.

Table: 2. Shear Force induced in columns of various stories with different patterns of bracing for Imperial Valley

Time History

Shear Force (kN)

Earthquake Time

History

Storey

No.

Bare

Frame

EB Brace

Frame

IV Brace

Frame

X Brace

Frame

V Brace

Frame

Imperial Valley

1 636.0 432.3 225.6 198.8 415.7

2 479.6 183.1 107.4 92.0 204.9

3 436.9 174.0 101.1 73.3 181.4

4 377.9 147.2 87.0 62.2 149.7

5 340.6 115.7 71.0 50.7 117.5

6 268.4 78.2 52.4 35.0 81.7

7 164.4 53.6 32.8 21.1 58.3

8 44.1 40.4 15.9 12.6 43.2

Figure 6: Shear Force comparison for bare frame and braced frame model for Imperial Valley earthquake

CONCLUSIONS

Through the Non Linear Dynamic Time History Analysis of

bare frame and braced frames led to the following

conclusions

1. An improvement in performance of structure was seen

through the fabrication of metallic bracings inside the

bare frame.



2. Metallic braces helped reducing the displacement at

each storey to about 40% averagely.

3. X and chevron braces were more effective as compared

to V and diagonal brace in controlling the storey

displacement.

4. The maximum amount of shear force was found in

bottom storey column and reduced for higher storey

column.

5. Metallic bracings helped in reducing the shear demands

on column members and was found least in case of X

and Chevron brace than V and diagonal brace.

6. The moment in columns also reduced effectively for X

and Chevron brace than V and diagonal brace which was

found to be maximum in bottom storey column.

7. The whole work concluded that the performance of

structure could be elevated through metallic bracings

which lowered the demands on the primary lateral loads

resisting members thereby safeguarding the elements.

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Analytical Study of Multistoried RCC Building with Various Bracing Systems on Seismic Response Control using Pushover Analysis Method