Comparative Analysis Of Different Irregular Building With Regular Building
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This document presents a comparative analysis of the seismic behavior of regular and irregular buildings through finite element modeling and time history analysis. Three 9-story building models are analyzed: a regular structure, and two irregular structures with and without a slab at the first story. The irregular structures show higher story displacements and lower story stiffness than the regular structure. Additionally, increasing the thickness of the first story slab in one irregular model reduces story displacements and drift compared to the other irregular model without a slab. In conclusion, structural irregularities affect seismic response quantities like base shear, stiffness, displacements and drift, with increased structural robustness at irregular locations helping to improve performance.
![International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 218
Comparative Analysis Of Different Irregular Building With Regular
Building
[1] Piyush Mishra [2] Er. Prince Yadav
[1] M.tech student, Institute of engineering and technology, Lucknow
[2] Asst. Professor, dept. of civil engineering, Institute of engineering and technology, Lucknow
---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract – This study comprises state-of-art knowledge
in the seismic response of vertically irregular building
frame, During severe seismic shaking irregular building
may suffer disproportionate damage or collapse that can
be minimized by increasing robustness. The prime
objective of this study is to find out the how irregular
buildings shows there behavior when the seismic loads or
effects with real time seismic data apply on the structure.
Analysis is going to be done with finite element analysis
using time history data in the E-TAB 2016 software, and
in seismic zone IV.
Key Words: Verticle irregularity, time history
analysis.
1. INTRODUCTION
Presence of asymmertricity in the reinforced concrete
increases seismic vulnerability; In areas in the word that
experience a high frequency of the earthquake,
considering irregularity is an integral part of the process
of earthquake engineering or structural designing
irregularities arise during an earthquake. Weakness in the
structure can be caused by discontinuities in the mass,
stiffness, or geometry. Vertical irregularity of a structure
becomes the primary cause of failure during an
earthquake. Zones with vertical irregularity are carefully
evaluated and developed with the appropriate treatment
when such structures are built in high seismic zones, such
as zone IV or zone V. Soil structure interaction's seismic
consequences must be taken into account. Three models—
Model 1 (regular), Model 2 (story-1, without slab), and
Model 3 (story-1, slab with double thickness) were taken
into consideration for analysis in the current study.
The comparative analysis of regular and irregular
structure will be based on the base shear, story stiffness,
Story displacement & drift analysis
Earthquake is the greatest anticipated lateral force that
results from ground acceleration and depends on the kind
of soil. Story Stiffness, or the total stiffness of all
permanent members participating in a certain story.
Here we are going to compare and analyze the different
type of buildings with there stiffness, base shear, story
displacement and drift index values. In modeling we used
the E-TAB 2016 for structural seismic analysis, we also
used the Finite Element Method with the Time History
input data. When it comes to irregular structure design
Time history method gives the best results for lateral force
distribution with actual ground acceleration data that has
been experienced in the past
2. OBJECTIVE
Main objective of the paper is to know the behavior of the
structure under different parameters
To know the behavior of the structure with
different geometric conditions
To know the story stiffness of the structure for
both regular and irregular
To know the base shear conditions in the both
the cases
To find out the Story Displacement difference
between symmetric & asymmetric building
To show the differences in Drift index for both
cases
3. METHDOLOGY
The present work is carried out to understand the
behavior of structure, when we use the irregular
building instead of regular building. There are step by
step procedures involved in the modeling and
analysis of the structure
Irregularities in buildings
Irregularities can be defined in two major parts, they
are:
1- Plan irregularity
2- Vertical irregularity](https://image.slidesharecdn.com/irjet-v9i837-221028100945-dd860d4b/85/Comparative-Analysis-Of-Different-Irregular-Building-With-Regular-Building-1-320.jpg)
Comparative Analysis Of Different Irregular Building With Regular Building
- 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 218 Comparative Analysis Of Different Irregular Building With Regular Building [1] Piyush Mishra [2] Er. Prince Yadav [1] M.tech student, Institute of engineering and technology, Lucknow [2] Asst. Professor, dept. of civil engineering, Institute of engineering and technology, Lucknow ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – This study comprises state-of-art knowledge in the seismic response of vertically irregular building frame, During severe seismic shaking irregular building may suffer disproportionate damage or collapse that can be minimized by increasing robustness. The prime objective of this study is to find out the how irregular buildings shows there behavior when the seismic loads or effects with real time seismic data apply on the structure. Analysis is going to be done with finite element analysis using time history data in the E-TAB 2016 software, and in seismic zone IV. Key Words: Verticle irregularity, time history analysis. 1. INTRODUCTION Presence of asymmertricity in the reinforced concrete increases seismic vulnerability; In areas in the word that experience a high frequency of the earthquake, considering irregularity is an integral part of the process of earthquake engineering or structural designing irregularities arise during an earthquake. Weakness in the structure can be caused by discontinuities in the mass, stiffness, or geometry. Vertical irregularity of a structure becomes the primary cause of failure during an earthquake. Zones with vertical irregularity are carefully evaluated and developed with the appropriate treatment when such structures are built in high seismic zones, such as zone IV or zone V. Soil structure interaction's seismic consequences must be taken into account. Three models— Model 1 (regular), Model 2 (story-1, without slab), and Model 3 (story-1, slab with double thickness) were taken into consideration for analysis in the current study. The comparative analysis of regular and irregular structure will be based on the base shear, story stiffness, Story displacement & drift analysis Earthquake is the greatest anticipated lateral force that results from ground acceleration and depends on the kind of soil. Story Stiffness, or the total stiffness of all permanent members participating in a certain story. Here we are going to compare and analyze the different type of buildings with there stiffness, base shear, story displacement and drift index values. In modeling we used the E-TAB 2016 for structural seismic analysis, we also used the Finite Element Method with the Time History input data. When it comes to irregular structure design Time history method gives the best results for lateral force distribution with actual ground acceleration data that has been experienced in the past 2. OBJECTIVE Main objective of the paper is to know the behavior of the structure under different parameters To know the behavior of the structure with different geometric conditions To know the story stiffness of the structure for both regular and irregular To know the base shear conditions in the both the cases To find out the Story Displacement difference between symmetric & asymmetric building To show the differences in Drift index for both cases 3. METHDOLOGY The present work is carried out to understand the behavior of structure, when we use the irregular building instead of regular building. There are step by step procedures involved in the modeling and analysis of the structure Irregularities in buildings Irregularities can be defined in two major parts, they are: 1- Plan irregularity 2- Vertical irregularity
- 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 219 In plan irregular buildings, five types irregularity present, they are: ● Torsion Irregularity ● Re-entrant Corners. ● Diaphragm Discontinuity. ● Out-of-Plane Offsets. ● Non-parallel Systems. In vertical irregular buildings also five types rregularity present they are: ●Stiffness. Irregularity ●Soft Storey ●Extreme Soft Storey. ●Mass Irregularity. ●Vertical Geometric Irregularity. Modelling For modelling and anlysing E-TAB 2016 software has been used , here I have been created three model having 9- story building with model Type-1 Regular bulding, Model type-2 Irregular building have no slab at story 1, Model Type-3 irregular building with double depth of slab on story 1
- 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 220 Structural Properties :- Plan dimension 16 X 15 m2 No. of stories 9 Floor to floor height 3000 mm Beam size 250X500 mm Column size 450X450 mm Thickness of slab 150 mm Zone IV Zone factor 0.24 (IS 1893:2016) Importance factor 1 (IS 1893:2016) Response reduction factor 5 (IS 1893:2016) Grade of concrete M30 Grade of steel Fe415 Density of concrete 25kN/m3
- 4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 221 Some of loading properties at building is describe below. There are various type of loading properties used in the structure are as follows Dead load of slab 3.75 kN/m2 Floor finish load 1.0 kN/m2 Roof finish load 1.0 kN/m2 Live load 3.0 kN/m2 (IS 1893:2016) There is one more fundamental to be added for valuable contribution i.e. Time History Data to be used for seismic valuation Time history data is always taken from the past experience of the seismic wave and that help in analyzing the real time valuation of structure designing TIME HISTORY DATA Depth (Km) 46.0 Magnitude 7.8 Region Iran-Pakistan-Border-Region All details taken from IMD Station Code DCE Station Lat. 28.795 N Station Long. 77.118 E Station Height (m) 208.0 Site Class CVs30 between200m/sec to375m/sec Record Time 16.04.2013 10:49:13.829 Sampling Rate 200Hz Record Duration 169.970Sec. Direction E-W (E-positive) Max. Acceleration 1.521cm/sec2 4. RESULT & OBSERVATIONS 4.1 STIFFNESS VALUE FOR REGULAR & IREGULAR BULDINGS As per observation of graph results shows that stiffness in the irregular building with double depth of slab at story 1 is 16.74% is more than regular building (model 1) & 23.92% more than the irregular building with no slab on story 1 (model 2) 4.2 BASE SHEAR VALUE FOR HARD SOIL As per observation of graph results shows that base shear in the irregular building with double depth of slab at story 1 is 3.80% is more than regular building (model 1) & 14.23% more than the irregular building with no slab on story 1 (model 2)
- 5. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 222 4.3 STORY DISPLACEMENT VALUE FOR HARD SOIL As per observation of graph results shows that story displacement in the irregular building with double depth of slab at story 1 is 7.76% is more than regular building (model 1) & 36.41% more than the irregular building with no slab on story1(model2) 4.4 DRIFT INDEX VALUE FOR ROCK/HARD SOIL As per observation of graph results shows that base drift index in the irregular building with double depth of slab at story 1 is 12.66% is less than regular building (model 1) & 9.12% less than the irregular building with no slab on story 1 (model 2) 5. CONCLUSIONS As we all know that base shear on super structure is all depend on the soil condition (stiffness of soil) as per observation maximum value of base shear gives in model -3 and model-2 shows lowest values than the model-1 & Model-3 Maximum value of base shear will be found at peak height of the structure , also base shear decreases as the stiffness of the soil decreases As we know story stiffness is the sum of stiffness of all permanent member present, as per observation maximum value of base shear gives in model -3 and model-2 shows lowest values than the model-1 & Model-3 Maximum value of stiffness is observed at the base of the structure As we know displacement of structure is observe with reference to base , as per observation maximum value of base shear gives in model -3 and model-2 shows lowest values than the model- 1 & Model-3
- 6. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 223 As per observations drift index in the irregular building with double depth of slab shows lowest value for drift index and regular building shows lesser value than the irregular with no slab on story 1, here model 2 shows lowest value among all of them 6. REFERENCES 1- Jinu Mary Mathew, Cinitha A, Umesha P K, Nagesh R Iyer and EapenSakaria (2014), “Seismic response of RC building by considering soil structure interaction” International Journal of Structural & Civil Engineering, Res. ISSN 2319 – 6009 Vol. 3, pp 160-172 2- Jiang Xinliang and Zhang Yanan (2013), “Influence of Structure Plane Size on Seismic Response of Soil-Structure Interaction”, World Earthquake Engineering, Vol.19 No.5.pp 345-350 3- Cinitha.A, Umesha P. K and Nagesh R. Iyer (2015), “Soil structure interaction analysis for seismic response of an asymmetric RC building”, International Conference on Computer Modeling and Simulation., pp 1-6 4- Shehata E. Abdel Raheem, Mohamed M. Ahmed and Tarek M. A. Alazrak (2015), “Evaluation of soil–foundation–structure interaction effects on seismic response demands of multi-story MRF buildings on raft foundations”, Advance Structural Engineering., pp 11-30 5- IS 1893(Part 1):2002, Criteria for Earthquake Resistant Design of Structures-General provisions and Buildings, Bureau of Indian Standards, New Delhi. 6- Shreya Thusoo, Karan Modi, Rajesh Kumar, Hitesh Madahar, “Response of Buildings with Soil Structure Interaction with Varying Soil Types” , International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, Volume-09, No-4,2015. 7- Kuladeepu M N, G Narayana, B K Narendra, “ssi effect on dynamic behavior of 3Dbuilding frames with raft footing”, IJRET: International Journal of Research in Engineering and Technology eISSN:2319-1163 |pISSN:2321-7308. 8- Renu Raghuveeran, Hashifa Hassan P, “Seismic Soil Structure Interaction Effects on RC Bare Frames Resting on Pile-Grid Foundation”, International Journal of Scientific and Research Publications, Volume5, Issue10, October 2015 1ISSN2250- 3153. 9- Mr. Rahul Sawantand. M.N. Bajad (2016), “Effect of Soil-Structure Interaction on High Rise RC Building”. IOSR Journal of Mechanical and Civil Engineering (IOSRJMCE), Volume 13, Issue1,pp85-91 10- Nitish Kumar. S,Praveen J. V. “Study of Soil Structure Interaction Effect on Multi-Story RCFrame Structures Resting Over Raft Foundation under Earthquake Caused Agitation”, InternationalJournal of Engineering Research & Technology (IJERT), ISSN: 2278-0181, Vol. 5 Issue 06, June-2016