A project report on, “Comparative study of simulation tools Staad V8, Etabs 2013, and Strap 2014 for seismic analysis of plan and vertical geometrically irregular building using Indian Standard Codes” Prepared in partial fulfillment of Study oriented project, Course code: CE G611 Computer Aided Analysis and Design Submitted by, Mr. Mandar Ganbavale (2013H143013H) Under guidance and supervision of Dr. Chandu Parimi Assistant Professor, Department of civil engineering. Birla Institute of Technology and Science, Pilani. Hyderabad Campus. (2014- 2015)
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A project report on,
“Comparative study of simulation tools Staad V8, Etabs
2013, and Strap 2014 for seismic analysis of plan and
vertical geometrically irregular building using Indian
Standard Codes”
Prepared in partial fulfillment of
Study oriented project,
Course code: CE G611
Computer Aided Analysis and Design
Submitted by,
Mr. Mandar Ganbavale (2013H143013H)
Under guidance and supervision of
Dr. Chandu Parimi
Assistant Professor, Department of civil engineering.
Birla Institute of Technology and Science, Pilani.
Hyderabad Campus.
(2014- 2015)
ii
Comparative study of
simulation tools Staad V8,
Etabs 2013, and Strap 2014
for seismic analysis of plan
and vertical geometrically
irregular building using
Indian Standard Codes
iii
CERTIFICATE This is certified that the project entitled
“Comparative study of simulation tools Staad V8, Etabs
2013, and Strap 2014 for seismic analysis of plan and
vertical geometrically irregular building using Indian
Standard Codes”
Submitted by,
Mr. Mandar Ganbavale (2013H143013H)
In partial fulfillment of the requirements of course code CE G611 Study Oriented
project, BITS Pilani, Hyderabad campus for the academic year 2014-2015. It is the record of
their own work carried out under our supervision and guidance.
Dr. Chandu Parimi
(Assistant professor, Department of Civil Engineering)
Birla Institute of Technology and Science, Pilani. Hyderabad Campus.
2014-15.
iv
ACKNOWLEDGMENT
Firstly, I would like to thank the curriculum of BITS, Pilani for giving me this
opportunity in doing Study oriented project.
I sincerely appreciate Dr. Chandu Parimi for giving me opportunity to work on this
topic. I am grateful for his support and guidance that have helped me to expand our horizon of
thought and expression.
I am also thankful of my friends for their help in sharing the information about
various aspects of this project.
Mr. Mandar Ganbavale
(2013H143013H)
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CHAPTER 1
INTRODUCTION
1. Objectives
The main purpose of this study oriented project is to detailed study the simulation tools
for seismic analysis and designing of structures.
Comparison of simulation tools STRAP, STAAD pro, ETABS and SAP 2000 for seismic
analysis of Plan and Vertical geometrically irregular multi-storey building.
2. Vertical and Plan irregular multistory buildings
According to IS 1893:2002 (Clause 7.1), there are mainly two types of irregularities,
Plan Irregularity
Vertical Irregularity
a. Plan irregularity –
Plan irregularity also of five types as follows:
i. Torsion Irregularity – To be considered when floor diaphragms are rigid in their
own plan in relation to the vertical structural elements that resist the lateral forces.
Torsional irregularity to be considered to exist when the maximum storey drift,
computed with design eccentricity, at one end of the structures transverse to an
axis is more than 1.2 times the average of the storey drifts at the two ends of the
structure.
ii. Re-entrant corners - Plan configurations of a structure and its lateral force
resisting system contain re-entrant corners, where both projections of the structure
beyond the re-entrant corner are greater than 15 percent of its plan dimension in
the given direction.
iii. Diaphragm Discontinuity - Diaphragms with abrupt discontinuities or variations
in stiffness, including those having cut-out or open areas greater than 50 percent
of the gross enclosed diaphragm area, or changes in effective diaphragm stiffness
of more than 50 percent from one storey to the next.
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iv. Out-of-plane offsets - Discontinuities in a lateral force resistance path, such as
out-of-plane offsets of vertical elements.
v. Non-parallel Systems - The vertical elements resisting the lateral force are not
parallel to or symmetric about the major orthogonal axes or the lateral force
resisting elements.
b. Vertical Irregularity –
Plan irregularity also of five types as follows:
i. Stiffness Irregularity -
1. Soft Storey - A soft storey is one in which the lateral stiffness is less than
70 percent of that in the storey above or less than 80 percent of the average
lateral stiffness of the three storeys above.
2. Extreme Soft Storey - A extreme soft storey is one in which the lateral
stiffness is less than 60 percent of that in the storey above or less than 70
percent of the average stiffness of the three storeys above. For example,
buildings on STILTS will fall under this category,
ii. Mass Irregularity - Mass irregularity shall be considered to exist where the
seismic weight of any storey is more than 200 percent of that of its adjacent
storeys. The irregularity need not be considered in case of roofs.
iii. Vertical Geometric Irregularity - Vertical geometric irregularity shall be
considered to exist where the horizontal dimension of the lateral force resisting
system in any storey is more than 150 percent of that in its adjacent storey.
iv. In-Plane Discontinuity in vertical elements resisting lateral force - An in-plane
offset of the lateral force resisting elements greater than the length of those
elements.
v. Discontinuity in capacity – Weak storey - A weak storey is one in which the storey
lateral strength is less than 80 percent of that in the storey above, the storey lateral
strength is the total strength of all seismic force resisting elements sharing the
storey shear in the considered direction.
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CHAPTER 3
COMPUTER TOOLS
1. STRAP –
STRAP is one of the most comprehensive and versatile structural analysis and design
software systems available on the market today. It's also the easiest to use, due to its superb graphic
user interface (GUI) and context-sensitive help system. It offers the engineer a powerful but
affordable tool for analysis and design of a wide range of skeletal and continuum structures such as
buildings, bridges, shells, towers and more.
STRAP uses graphical input for the generation of models and loads. Every drawing on the
screen can be printed, imported into other documents, or (through DXF) into drawings. Complete
analysis and design can be performed for any structure without ever referring to joint or beam
numbers. Load combinations can be created after analysis is performed. Combinations can be
changed instantly without solving the model again.
STRAP comes with design modules for designing reinforced concrete, post-tensioned
concrete and structural steel (hot-rolled and cold-formed). For the engineer interested in dynamic
effects, STRAP also includes modules for modal analysis, seismic response spectra calculations
according to many codes and time history response calculations.
The learning curve to start using STRAP is practically non-existent. The program's flow is
similar to the analysis and design process performed by hand. During the execution of every action
the prompt line at the bottom of the screen guides us through. Combine this with the context-sensitive
help.
2. STAAD Pro –
STAAD.Pro allows structural engineers to analyze and design virtually any type of
structure through its flexible modeling environment, advanced features and fluent data
collaboration. Flexible modeling is provided by a state-of-the-art graphical environment and the
design supports over 70 international codes and over 20 U.S. codes in 7 languages.
An array of advanced structural analysis and design features are included such as nuclear
certification for 10CFR Part 50, 10CFR 21, ASME NQA-1-2000, time history and push over
analysis and cable (linear and non-linear) analysis.
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Efficiencies are gained through the ability to maintain and streamline current workflows
with fluent data collaboration. STAAD.Pro integrates with other Bentley products such as
STAAD.foundation and ProSteel and OpenSTAAD is provided for integration with third party
programs. Increased client base and therefore business growth can be realized in using
STAAD.Pro to serve a broad spectrum of structural design projects and a global market.
3. SAP 2000 –
From its 3D object based graphical modeling environment to the wide variety of analysis
and design options completely integrated across one powerful user interface, SAP2000 has
proven to be the most integrated, productive and practical general purpose structural program on
the market today. This intuitive interface allows you to create structural models rapidly and
intuitively without long learning curve delays. Now you can harness the power of SAP2000 for
all of your analysis and design tasks, including small day-to-day problems. Complex Models can
be generated and meshed with powerful built in templates. Integrated design code features can
automatically generate wind, wave, bridge, and seismic loads with comprehensive automatic
steel and concrete design code checks per US, Canadian and international design standards.
Advanced analytical techniques allow for step-by-step large deformation analysis, Eigen
and Ritz analyses based on stiffness of nonlinear cases, catenary cable analysis, material