INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
ANALYSIS AND DESIGN OF A MULTISTORIED BUILDING FOR
SEISMIC ZONE III BY STAAD.Pro
M.MANOJ1; K.N.S.SAI VANI1 , A.NARENDRA KUMAR2 , P.Siva Prasad3
1
Final Year B.Tech Student, 2Asst.Professor, 3 Professor & HoD
Department of Civil Engineering, Dhanekula Institute of Engineering & Technology,
Vijayawada – 521139, Andhra Pradesh
E-mail: narendrakumar.a.ce@gmail.com bandidinesh43@gmail.com diet.cehod@gmail.com
ABSTRACT:
As a developing state like Andhra Pradesh especially in Vijayawada a recent survey has evolved that
our city was in a dangerous condition and located in Seismic Zone-III.Occurance of few earthquakes
during last decades in various seismic zones has pointed to our short coming in risk reduction programs.
A survey noticed that an earthquake of Richter scale 7 occurs in Ongole (200KM far away from
Vijayawada) half part of Vijayawada city will be severely affected. It was a big situation in front of us
only due to no one are following the earth quake resistant design rules in their constructions due to
improper awareness about construction,cost,safety and durability.
Key Words: Earthquakes, Seismic Zone, Richter scale
INTRODUCTION:
An earthquake is a sudden release of energy due to shifts in the earth’s plates that has been stored in the rocks
beneath the earth’s surface which causes a trembling or shaking of the ground.
The structure can be entirely immune to damage from Earthquakes; the goal of Earthquake-resistant
construction is to erect structures that fare better during seismic activity than their conventional counterparts.
According to building codes earthquake-resistant structures are intended to withstand the largest earthquake of a
certain probability that is likely to occur at their location.
AIM:
The main aim of this project is “Analysis and Design of a Multistoried Building for Seismic zone III by Staad.pro"
Objectives:
1. The objective of design codes is to have structures that will behave elastically under earthquakes that can be
expected to occur more than once in the life of the building
2. Good planning and design will not alone aid in resisting seismic forces but good workmanship and
construction practice will add more strength for resisting the seismic forces.
3. The overall goal is to be able to design earthquake resistant structures that are Safe, Economical, and
Efficient.
Literature Review:
Das and Murthy, 2004 Sumatra earthquake concluded that infill walls, when present in a structure,
generally bring down the damage suffered by the RC framed members of a fully unfilled frame during
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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
earthquake shaking. The columns, beams and infill walls of lower stories are more vulnerable to damage than
those in upper stories.
Working plan
Statement of the Project:
A G+4 building is taken for analysis. The salient features of the building are:
1. Type of structure = Multi Storey Frame.
2. Seismic zone = III
3. Type of soil = Medium
4. No. of stories = (G+4)
5. Imposed Load = 2.0 KN/m2
6. Floor finishes = 1 KN/m2
7. Depth of slab = 120 mm
8. Materials = M 20 concrete and Fe 415 steel
9. Unit weight of RCC = 25 KN/m2
10. Beams = 300 × 450 mm
11. Columns = 300 × 500 mm
12. Wall thickness = 250mm
13. Total height = 16.5m
14. Floor height = 3.3m
15. Stilt Floor height = 3.3m
16. Plinth height = 0.9 m
DESIGN PHILOSOPHIES
a) To ensure that structures possess at least a minimum strength to withstand minor
earthquakes without damage.
b) Structures withstand a major earthquake without collapse. The basic design philosophy adopted in this
project is limit state method. An improved design philosophy to overcome the drawbacks of the working
stress method is the limit state method.
SCOPE OF STUDY
1. Provide guidelines for Earthquake Planning and Recovery
2. Provide recommendations that can mitigate the losses due to earthquake
3. Enhanced planning and design knowledge of high rise buildings.
4. Exposure to Staad.pro design software and AutoCAD software.
RECOMMENDATIONS
Standards available in their offices and all their staff should fully familiarize with the contents of these codes:
IS 1893:2002 (part-I) for seismic loads.
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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
IS 456:2000 (Indian Standard Plain and Reinforced Concrete Code of Practice).
IS 875:1987 (Part-I) for Dead Loads.
IS 875:1987 (Part-II) for Live or Imposed Loads.
IS 13920:1993 for Ductility Consideration.
METHODOLOGY
The process of analysis and design commences with analysing, planning of the structure, primarily to meet its
functional requirements. This Project is done by using Equivalent Static Lateral Force Method.
Equivalent Static Lateral Force Method
This is a linear static analysis. This approach defines a way to represent the effect of earthquake ground motion
when series of forces are act on a building, through a seismic design response spectrum. This method assumes that
the building responds in its fundamental mode. To account for effects due to "yielding" of the structure, many codes
apply modification factors that reduce the design forces. In the equivalent static method, the lateral force equivalent
to the design basis earthquake is applied statically. The design seismic forces acting on a structure as a result of
ground shaking are usually determined by one of the following methods:
1. Static analysis, using equivalent seismic forces obtained from response spectra for horizontal earthquake motions.
2. Dynamic analysis, either modal response spectrum analysis or time history analysis with numerical integration
using earthquake records.
FUNCTIONAL DESIGN
Functional design is the basic design step in any construction because the structure must and should satisfy the
functional requirement of the consumer.
STRUCTURAL DESIGN
Structural design is an art and science of understanding the behaviour of structural members subjected to loading
conditions and designing them with economical, safe, serviceable and durable structure.
Stages in Structural Design: The process of structural design involves the following stages:
A. Structural planning
B. Computation of loads
C. Methods of analysis
D. Design of Structural elements
After getting an architectural plan of the buildings, the structural planning of the building frame is done.
Structural Planning based on the structural member’s location, orientation and dimensions.
The loads calculation basis actual seismic force that
should be generated in the structure will be
computed. And distributed.
Gravity Loads of Frame A2-B2-C2
Gravity Loads of Frame A1-B1-C1
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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
Gravity Loads Frame A1-A2-A3-A4-A5
Gravity Loads of Frame A3-B3-C3
Gravity Loads Frame B1-B2-B3-B4-B5
Bending Moment along Y&Z Direction
Seismic Load Calculation: Fundamental time period T is obtained by using the following
Formula:
Ta = 0.075 h0.75 [IS 1893 (Part 1):2002, Clause 7.6.1]
Ta = 0.075 h0.75 [IS 1893 (Part 1):2002, Clause 7.6.1]
Zone factor, Z = 0.16 for Zone III (IS: 1893 (Part 1):2002, Table 2
Importance factor, I = 1 (residential building) Medium soil site and 5% damping)
In X – Direction Sa/g = 2.5 → Ah = 0.04
In Z – Direction Sa/g = 2.125 → Ah = 0.03
Design Seismic Base Shear Vb = Ah W
Vb = 0.04×12642.39= 505.69 KN (In X direction)
Vb = 0.03×12642.39 = 379.27 KN (In Z direction)
W = Seismic weight of all the floor
Ah = Horizontal Acceleration
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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
Horizontal Loads at Different Floor Levels in X-direction
Wᵢhᵢ²/
Wih i2
Storey Wi (KN) h i(m) ∑Wᵢhᵢ² Vi (KN)
600842.13 0.413 208.84
5 2206.95 16.5 208.84
454567.76 0.312 157.77
4 2608.86 13.2 366.61
255694.36 0.176 89.00
3 2608.86 9.9 455.61
113641.94 0.078 39.44
2 2608.86 6.6 495.05
28410.48 0.019 9.60
1 2608.86 3.3 504.65
∑Wᵢhᵢ²= 1453156.67
Total
Horizontal Loads at Different Floor Levels in Z-direction
Wᵢhᵢ²/
Wih i2
Storey Wi (KN) h i(m) ∑Wᵢhᵢ² Vi (KN)
600842.13 0.413 156.63
1 2206.95 16.5 156.63
454567.76 0.312 118.33
2 2608.86 13.2 274.96
255694.36 0.176 66.75
3 2608.86 9.9 341.71
113641.94 0.078 29.58
4 2608.86 6.6 371.29
28410.48 0.019 7.20
5 2608.86 3.3 378.49
1453156.67
Total ∑Wᵢhᵢ² =
DESIGN OF STRUCTURAL MEMBERS
Structural elements are
Reinforcement Details of Beam
Reinforcement Details of Slab
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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
Reinforcement Details of Column
Structure under seismic load
CONCRETE TAKE OFF
CONCRETE TAKE OFF (FOR BEAMS AND
COLUMNS DESIGNED ABOVE)
TOTAL VOLUME OF CONCRETE = 150.56
CU.METER
BAR DIA WEIGHT
(In mm) (In KN)
-------- --------
8 21152.24
10 16101.25
12 29994.89
16 2202.81
Reinforcement Details of Pile Cap 20 2377.51
25 975.17
------------
Analysis and Design using Staad Pro TOTAL= 72803.86 KN
References
Earthquake Resistant Design of Structures
by Pankaj Agarwal
Earthquake Resistant Design of Structures
by S.K.Duggal.
IS 1893-2002, Part I Earthquake Resistant
Design.
IS 875, part 1, 1987(dead loads for building
and structures)
IS 875, part 2, 1987(imposed loads for
buildings and structures)
IS 456:2000 (reinforced concrete for
Load case generation general building construction)
Conclusions:
By this way Analysis and Design of a Multistoried
Building for Seismic zone III by Staad.pro. We can
further proceeds dynamic analysis also.
Finally we concluded that all the Civil Engineers,
Designers and Consumers try to follow The
Earthquake Resistant Design Principles in any
structural construction for a better way of living .
Seismic load generation
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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTING SCIENCE ISSN NO: 0972-1347
Volume 5, Issue 7, July 20187 78 http://ijics.com/
