Static Analysis and Design of G+20 RCC Framed Structure by using ETABS Software

Abstract

Practical knowledge is an important and essential skill required by every engineer. For obtaining this skill, an apartment building is analyzed and designed, seismic zone II with (G+20) stories having a car parking facility provided at basement floor. The building has a shear wall around the lift pit. The modelling and analysis of the structure is done by using ETABS and the designing was done. Design of slab, stair case are done manually. The design methods involve load calculations manually and analyzing the whole structure by ETABS. The design methods used in ETABS are limit state design confirming to IS code of practice. From analysis, the parameters like storey displacement, storey drift, base shear and story shear, bending moments are determined and also comparative study is done for both the methods

Introduction

I. INTRODUCTION

It is not an easy task to build a beautiful and strong building which can withstand against harshed conditions. We all know that today technology has achieved milestones in every field, and that's why even civil engineering needs to be upgraded. This has led to several changes in how civil engineers work and perform. Not just the use of technology has made lives way easier but has also because of the development of some really helpful software, encouraged civil engineers to give their best. “etabs-extended 3d analysis of building systems”, is a engineering software. It is an engineering software that is used in construction and planning and designing of buildings. It has provided a very different options and opportunities to make structures efficiently and in less time with full safety. It is loaded with an integrated system consisting of modeling tools, code-based load analysis,  solution to the problems techniques. It can handle the complex and big building models and associated requirements. Etabs software is widely in use nowadays for construction of buildings. 

A. Multi-Storey Building

A multi-story building is a structure that upholds at least two stories over the ground. There is no formal restriction on the height of such a building or the number of floors a multi-story building may contain, though taller buildings do face more practical difficulties. But, from a structural engineer's point of view the tall building or multistoried building can be defined as one that, by virtue of its height, is affected by lateral forces due to wind or earthquake or both to an extent that they play an important role in the structural design. Tall structures have fascinated mankind from the beginning of civilization. The Egyptian Pyramids, one among the seven marvels of world, built in 2600 B.C. are among such antiquated tall designs. Such designs were built for protection and to show pride of the populace in their civilization. The development in present day multistoried structure development, which started in late nineteenth 100 years, is expected to a great extent for business and private purposes. The development of the high-rise building has followed the growth of the city closely. The process of urbanization, that started with the age of industrialization, is still in progress in developing countries like India. Industrialization causes migration of people to urban centers where job opportunities are significant. The land available for buildings to accommodate this migration is becoming scarce, resulting in rapid increase in the cost of land. Thus, developers have looked up the sky to make profits. The result is multistoried buildings, as they provide a large floor area in a relatively small area of land in urban centers.

B. About ETABS

ETABS is an engineering software product that caters to multistory building analysis and design. Displaying apparatuses and formats, code-based load remedies, examination strategies and arrangement procedures, all direction with the lattice like calculation novel to this class of design. Fundamental or high-level frameworks under static or dynamic circumstances might be assessed utilizing ETABS.

For a refined appraisal of seismic execution, modular and direct-coordination time-history investigations might couple with P-Delta and Large Displacement impacts. Nonlinear connections and concentrated PMM or fiber pivots might catch material nonlinearity under monotonic or hysteretic conduct. Instinctive and coordinated highlights make uses of any intricacy functional to carry out. Interoperability with a progression of plan and documentation stages makes ETABS an organized and useful instrument for plans which range from straightforward 2D casings to expand present day tall structures.

C. Importance of Seismic Analysis

Seismic study is a very important study. It helps in understanding the behavior of structures of various types subjected to earthquake loads, and how we can protect the inhabitants of that structure in the event of an earthquake Seismic concentrate additionally assists with understanding the different kinds of seismic waves that start, assisting us with planning the zones of continuous quakes and stable zones. The study of seismic activity of a particular zone helps in establishing minimum standards of safety for that zone, making life easier to continue post-earthquake.

D. Aim and Objective

The objectives are as listed below:

• The objective is to design the G+20 building (structural system) by using ETABS
• To prepare a 3D model of a multi-storey RCC building using ETABS software.
• Analyze building for seismic analysis and Dead load, Live load and Earthquake load using static method and dynamic method structure.
• Comparison of static and dynamic methods, displacement, story drift, base shear
• To design the building against the effect of seismic forces or to make the structure earthquake resistant.
• To get the knowledge and to design the structural elements like beams, columns, slabs

II.  DESIGN PHILOSOPHY

A. Structure Details And Materials

1. Type of Structure Building    = G+20 Residential
2. Depth of foundation = 2m Below GL.
3. Depth of plinth =1.5 m
4. Floor to floor height    = 3.m
5. Seismic Zone = II Zone
6. Importance Factor= 1
7. Response Reduction Factor    = 5
8. Soil Type   = Medium Type II
9. Live load    = 3 KN /M2
10. Thickness of wall = 300mm and 150mm
11. Column size = 600 x 600mm
12. Beam size = 300 x 600mm
13. Grade of concrete M35 , grade of steel fe 415
14. Safe bearing capacity 300 kn/m2
15. Slab =150 mm ,  Shear Wall = 250mm
16. AAC blocks having unit weight 6 kn/m2  

B. Load and Details

1. Internal wall under primary beam = 5.4 kn / m
2. External wall under primary beam =5.61 kn / m
3. Parapet wall = 5.61 kn / m
4. Super impose load on floor = 4 Kn/m2
5. Live load = 3 kn / m2
6. Live load on terrace and head room =  1.5 kn / m2
7. Earthquake load = as per 1993 part 1 2016
8. Wind loads  auto select in etabs

C. E TABS Modelling and Analysis

III. ANALYSIS  RESULT AND DISCUSSION

In this there are some important modal checks are perform, base reactions are calculated as per program calculated ,moment Diagram, Shear Force  Diagram,  auto wind load application , auto seismic load application ,story displacement , story stiffness etc   also Auto Design of member of structure by Etabs is performed.

1. Analyze the Structure and Check the Behavior 
2. Analyze the Model by Run Analysis
3. Check Analysis Run Log to check that Model does not run into Instability
4. Check Storey Drift Limitation as per CL.7.11.1.1 of IS 1893 (Part 1) : 2016
5. Check Torsional Irregularity as per C1.7.1 and Table 5 of IS 1893 (Part 1) : 2016

Conclusion

1) This project has given an opportunity to re-collect and co-ordinate the various methods of designing and engineering principles which we have learnt in our earlier classes. 2) E tabs software provides adequate strength durability, serviceably ,along with the economy 3) E tabs is based on limit state method 4) Displacement is more as the story increases thus the 20th story is having high displacement 5) The forces and support reaction are minimum as the response factor is taken zone 2 6) Failed beams and columns can be resized by selecting definite beam and columns 7) As the story height increases then the bending moment for beams and columns will also increases 8) Replacement of AAC blocks instead of conventional bricks will reduces the dead load and affect the shear force and bending moment to reduce 9) The dimensions of beams and columns should be increases to resist the seismic load 10) By using ETABS, the analysis and design work can be completed within the stipulated time. 11) The analysis and design results obtain from software are safe when compared with manual calculations as per Is 456 2000 design. 12) Usage of ETABS software minimizes the time required for analysis and design. 13) In ETABS steel reinforcement adapted is adequate when compared to staad pro, this benefits the economicvalue of steel during construction

References

[1] Analysis of g+30 high rise buildings by using etabs for various frame sections in zone iv and zone v, a pavan kumar reddy, r master praveen kumar, international journal of innovative research in science engineering and technology vol.6, issue 7, july 2017. [2] Analysis and design of g+5 residential building by using etabs, k naga sai gopal, n lingeshwaran, international journal of civil engineering and technology(ijciet) vol.8 issue 4, april 2017. [3] Analysis and design of a multi storied residential building of (ung-2+g+10) by using most economical column method, m mallkarjun, dr p v surya prakash, international journal science engineering and advance technology vol.4 issue 2, feb 2016 [4] Sesimic analysis and design of multi story building using etabs, Rinkesh R Bhandarkar, Utsav M Ratanpara & Mohammed Qureshi, I [5] IS 456 2000 code of practice for plain and reinforced concrete [6] IS 875 - 1987 code of practice for design loads for buildings and structures-dead loads [7] IS 875 - 1987 code of practice for design loads for buildings and structures-imposed loads [8] Is 1893 - 2002 part 1 criteria for earthquake resistant design of structures [9] Is 875 - 2015-part 3 code of practice for design loads for buildings and structures-wind loads [10] Structural analysis II by S S BHAVIKATTI – Vikas publications [11] Design of reinforced concrete structures by N KRISHNARAJU – CBS publications [12] Earthquake resistance design of structures by PANKAJ AGARWAL, MANISH SHRIKHANDE-PHI LEARNING pvt.ltd [13] P. Srikanth Reddy, C.V. Siva Rama Prasad, Dr. S. K. RAO and Y. Vijay Simha Reddy, Blast Resistant Analysis and Design Techniques For RCC Multistorey Building Using ETABS, International Journal of Civil Engineering http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=9&IType=1 [14] Maheedhar, B. R., Kumar, M. A., Nagarjuna, S., & Prasad, C.V. Siva Rama Prasad. Analysis and Design of g+ 12 storey building with shear wall effect with two basements, International journal if engineering and technology, vol.5, issue .5, May- 2018

Copyright

Copyright © 2023 Tushar D Patil, Rohan P Joshi, Kaustubh M Manudhane, Abhijit A Shinde, Vipul S Tekawade, Dr. Vidya R Saraf. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.