Seismic and Wind Analysis of G+4 Story Building Resting on Slope Using Different Types of Bracing

10

VII

https://doi.org/10.22214/ijraset.2022.45628

July 2022

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com

Seismic and Wind Analysis of G+4 Story Building Resting on Slope Using Different Types of Bracing System Surya R1, Dr. R. Subhash Chandra Bose2, Pallavi H J3 1

Post Graduation Student,

2, 3

Associate professor, Department of civil engineering, ACS College of Engineering, Bengaluru

Abstract: The majority of the developments in sloping districts are compelled by nearby geography which brings about the reception of either a stage back or step back &set back setup. Because of this the design is sporadic by temperance of fluctuating segment levels at 200 incline prompting twist and expanded shear during seismic ground movement and wind influence. The powerful investigation is done utilizing reaction range technique to the step back building outlines. The unique reaction for example story removal and float, and base shear activity actuated in sections have been read up for structures of various levels and for various supporting frameworks. These outcomes show that the presentation of step back considering various kinds of bracings to the structure outlines, a superior exhibition can be seen when contrasted and step back without supporting. The best and practical supporting framework is chosen by looking at the outcomes acquired from the investigation.

Keywords: Hill slope angle,Static analysis ,Dynamic analysis,Response spectrum,analysis,step back frame, step back with bracings, story drift,Story shear.

I. INTRODUCTION Wind load is one of the critical arrangement loads for primary planning developments. For long reach ranges, tall designs and high zeniths or post structures, wind weight may be taken as a fundamental stacking, and tangled strong breeze load influences control the primary format of the development. Consequently data on the strong qualities of a huge development under wind stacking transforms into a need in planning plan and in educational survey. In the nonstop assessment project on tall designs, the examination of wind-impelled demands is named: along-wind and crosswind responses. These solicitations are achieved by different parts. A propped outline is a really impressive underlying framework usually used in structures subject to sidelong loads like breeze and seismic tension. The individuals in a supported blueprint are overall made of hidden steel, which can work capably both in endlessly pressure.

II. LITERATURE REVIEW D.J.Misal, M.A.Bagade (2016), Seismic Behaviour of Multi-Storied RCMRF Buildings Resting on Sloping Ground, These outcomes show that the presentation of step back and debilitate building outlines are more appropriate regarding experience back building outlines. Building models are investigated by Etabs programming to zero in on the impact of stretch of time, story development and base shear.

“A Review on Seismic Response of RC Building on Sloping Ground” by S. D. Uttekar, C. R. Nayak they are extremely unpredictable and unsymmetrical in even and vertical planes, and torsionally coupled. Because of the headed in a different direction of activity of plans in unpleasant districts, these plans become astoundingly capricious and unequal, because of variety in mass and power distributions on various vertical turn at each floor. Such headway in seismically skewed locale makes them acquainted with extra obvious shears and curve when stood apart from regular development.

“Influence of Slope Angle Variation on The Structures Resting on Sloping Ground Subjected to Heavy Winds” by Prof. D.N. Kakde1, Shaikh Mohd. Kasheef. In this examination study, the plans laying on inclining ground also introduced to critical breeze has been studied. The increases were all gotten done with utilizing SAP-2000. The secret show was reviewed considering the cutoff points like Base response, Time Period, and the out and out movements of the arrangement under significant breeze.

“A Review on effect of positioning of RCC shear walls of different shapes on seismic performance of building resting on sloping ground using STAAD-Pro” by M. Tech Scholar Ayush Kumar Agrawal, Prof. Nitesh Kushwaha These dividers for the most part start at establishment level and are ceaseless all through the development height. Their thickness can be basically essentially as low as 150mm, or as high as 400mm in raised structures.

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2063

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com “Effect of Slope Angel Variation on Tall Structure Resting On Sloping Ground with Soil Structure Inter-Action”, by Harish Rathod, Thushar Shetty. This study assessments the breeze reaction of plans on level and inclining region with different plan game-plans, for example, holy messenger collection of plans and the usage of X supporting on the breeze block of advancements.

III. OBJECTIVES 1) To model G+4 story building without bracings on slanting ground of slope 200 slant in ETABS programming for territory classification 2 2) To model G+4 story building with various kinds of steel bracings on slanting ground of slope 200 in ETABS programming.

3) To study behaviour of structure with different types of bracing system.

4) To compare overall outcomes obtained with and without bracings.

5) To do displaying and reaction range examination of conduct because of wind load and seismic heaps of many floor R.C.C. structures laying above slanting ground utilizing ETABS programming. Dynamic reaction of these structures, as far as base shear and dislodging are find out and analysed inside considered arrangement as well similarly as with different setups in ETABS models.

IV. METHODOLOGY 1) A broad writing audit is completed to layout above targets for scaled-down project work.

2) A G+4 and slope of 20 degree with and without different types of bracings is selected.

3) ETABS programming is picked for displaying and examination of chosen structures.

4) To discover seismic boundaries like story drift and story displacements.

5) G+4 and 20-degree slope RCC multi-story with different types of bracings and unbraced structures are taken and dynamic investigations are to be completed utilizing product ETABS. 6) Using codal arrangement for plan, y is IS456: 2000, IS800:1998, and IS875: 2015 (Part-3) 7) To plan for M30 grade of cement and Fe550 steel.

1) 2) 3) 4) 5) 6) 7) 8) 9) 10)

V. BUILDING DETAILS Total number of storeys = 5 Grid lines in X axis = 4 Width of grid lines in y axis = 4 Distance between grids in X axis = 3m Distance between grids in Y axis = 3m Similar story ht = 3 m Bottom story ht = 3 m Seismic zone = V Soil type = II Terrain category = 2 VI. PARAMETERS CONSIDERED FOR THE BUILDING DESIGN Parameter Structure Type

Type\Value Regular Framed Building Structure

Number of Stories

5

Bottom Storey Height Top Storey Height Type of Structure

3m 3m Square

Area of Structure Beam Size Grade of Concrete

81m2 0.3 m x 0.3 m M30

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2064

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com Column Size Grade of Concrete Thickness of Slab Steel Bracings Live Load Basic Wind Speed Importance Factor Terrain Category Class of Structure Zone Response reduction factor, R Floor Finish Type of soil Concrete Density

0.4 m x 0.4 m M30 0.150m M30 ISA 200 x 200 x 25 mm 3kN\m2 Vb = 50m/s 1 2 B V 5 1 kN/m2 II (silt) 25 N/m3

VII. ETABS MODELS

Fig.3.1. Model 1: G+4 Building Without Bracings at 200 Slope

Fig.3.2. Model 2: G+4 Building With X- Bracings at 200 Slope

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2065

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com

Fig.3.3. Model 4: G+4 Building With Inverted V- Bracings at 200 Slope

Fig.3.4 Model 5: G+4 Building With Single Diagonal Bracings at 200 Slope VIII.

RESULTS AND DISCUSSIONS

A. Response Spectrum 1) Without bracings Table 4.1: Story displacement without bracings Story no

Floor ht

Location

m

X axis

Y axis

mm

mm

5

15.0

Top

6.062

5.751

4

12.0

Top

5.074

4.796

3

9.0

Top

3.468

3.247

2

6.0

Top

1.502

1.368

1

3.0

Top

0.0

0.0

Ground

0.0

Top

0.0

0.0

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2066

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com

Displacements in mm

STORY DISPLACEMENTS(EQx) 7 6 5 4 3 2 1 0

6.062 5.074 3.468 1.502 0

0

Story5 Story4 Story3 Story2 Story1 Base

Story Fig 4.1: Story displacement without bracings 2) With X Bracings

STORY DISPLACEMENTS (EQx)

Displacements in mm

3.5

2.92

3

2.555

2.5

1.843

2 1.5

0.838

1 0.5

0

0

0 Story5 Story4 Story3 Story2 Story1 Base

Story Fig 4.2: Story displacement with X-bracings Table 4.2: Story displacement with X-bracings Story no

Floor ht

Location

m

X axis

Y axis

mm

mm

5

15.0

Top

2.92

0.01

4

12.0

Top

2.555

0.01

3

9.0

Top

1.843

0.01

2

6.0

Top

0.838

0.011

1

3.0

Top

0.0

0.0

Ground

0.0

Top

0.0

0.0

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2067

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com Max Displacements due to Wind Loads mm 30.981 26.181 28.506 25.989 26.065

Types Of Bracings Without bracings With x bracings With v bracings With inverted v bracings With single diagonal bracings 3) With V Bracings

Displacements in mm

STORY DISPLACEMENTS (EQx) 4

3.487

2.899

2.126 0.919

2

0

0

0 Story5 Story4 Story3 Story2 Story1 Base

Story

Fig 4.3: Story displacement with V-bracings

4) With inverted V- Bracings

STORY DISPLACEMENTS (EQx) Displacements in mm

2.723 2.355 1.689 0.649

0

0

5 0

Story

Fig 4.4: Story displacement with inverted V-bracings B.

Comparison of Max Displacements B/W types of Bracing Systems: Table 4.5: Comparison of Max Displacements B/W types of Bracing Systems

Max Displacements in mm

Comparision B/W Types of Bracing Sysytems 40 30 20

30.981

26.181

28.506

25.989

26.065

10 0 WITHOUT BRACINGS WITH X BRACINGS WITHWITH V BRACINGS INVERTED WITH SINGLE V BRACINGS DIAGONAL BRACINGS Bracing Systems

Fig 4.5: Comparison of Max Displacements B/W types of Bracing Systems

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2068

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com C.

Base Shear Table 4. 6: Comparison of Base Shear Max Base She ar in kN -131.9634 -121.676

Types of Bracings Without Bracings With X Bracings With V Bracings With Inverted V Bracings With Single Diagonal Bracings

-124.9347 -123.9485 -121.9634

BASE SHEAR(Wx) -116

BASE SHEAR IN kN

-118 -120 -122

-121.676

-124 -126

-121.9634 -124.9347

-123.9485

-128 -130 -132 -134

-131.9634

Fig 4.6: Comparison of Base Shear IX. CONCLUSION A. Storey Displacemts 1) It is obtained from analysis that the building with X-bracings will reduce 15.49% of story displacement than the model without the bracings.

2) It is obtained from analysis that the building with V-bracings will reduce 9.03% of story displacement than the model without the bracings.

3) It is obtained from analysis that the building with inverted V-bracings will reduce 16.11% of story displacement than the model without the bracings.

4) It is obtained from analysis that the building with Single Diagonal bracings will reduce 15.86% of story displacement than the model without the bracings.

From the above obtained results it is concluded that the bracing system reduces the story displacement by an average percentage of 14.122% and it is concluded that the best and economical bracing system suitable for the building is Single Diagonal Bracings, based on the economical aspect.

B. Story Shear / Base Shear 1) It is obtained from analysis results that base shear obtained for building model without bracing is 7.79% more than building model with X-bracings.

2) It is obtained from analysis results that base shear obtained for building model without bracing is 5.32% more than building model with V- bracings.

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2069

International Journal for Research in Applied Science & Engineering Technology (IJRASET) ISSN: 2321-9653; IC Value: 45.98; SJ Impact Factor: 7.538 Volume 10 Issue VII July 2022- Available at www.ijraset.com 3) It is obtained from analysis results that base shear obtained for building model without bracing is 6.09% more than building model with inverted V-bracings.

4) It is obtained from analysis results that base shear obtained for building model without bracing is 7.57% more than building model with single diagonal bracings.

From the above obtained results regarding the Base Shear it is concluded that all the type of bracing system reduces the base shear on an average percentage of 6.6925% and the best suitable system of bracing from the sloping ground of 200 Single Diagonal Bracing System, based on the economical aspect.

REFERENCES [1] [2] [3] [4] [5] [6] [7] [8] [9]

“Seismic Behaviour of Multi-Storied RCMRF Buildings Resting on Sloping Ground” by D.J.Misal.

“Study of Seismic Behaviour of Multi-Storied R.C.C. Buildings Resting on Sloping Ground and Considering Bracing System” by D. J. Misal, M. A. Bagade.

“A Review on Seismic Response of RC Building on Sloping Ground” by S.D.Uttekar, C.R.Nayak.

“Influence Of Slope Angle Variation On The Structures Resting On Sloping Ground Subjected To Heavy Winds” by Prof. D.N. Kakde1, Shaikh Mohd.

Kasheef.

“A Review on effect of positioning of RCC shear walls of different shapes on seismic performance of building resting on sloping ground using STAAD-Pro”

by M.Tech Scholar Ayush Kumar Agrawal, Prof.Nitesh Kushwaha.

“Effect of Slope Angel Variation on Tall Structure Resting On Sloping Ground with Soil Structure Inter-Action” by Harish Rathod S, Thushar Shetty.

IS 456: (2000) Indian Standard Code of Practice for Plain and Reinforced Concrete, Bureau of Indian Standards, New Delhi.

IS 875: (Part 3): 2015 Design Loads (other than Earthquake) For Buildings and Structures. Bureau of Indian Standards – Code of Practice, New Delhi.

IS 800:1998 Indian standard code of practice for steel, Bureau of Indian Standards, New Delhi.

©IJRASET: All Rights are Reserved | SJ Impact Factor 7.538 | ISRA Journal Impact Factor 7.894 |

2070