DOI : 10.17577/IJERTCONV10IS06053
- Open Access
- Authors : Mirshad E M, Dr. Susan Abraham
- Paper ID : IJERTCONV10IS06053
- Volume & Issue : ICART – 2022 (Volume 10 – Issue 06)
- Published (First Online): 22-06-2022
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License:
This work is licensed under a Creative Commons Attribution 4.0 International License
Effect of Bracing Location in PEB Under LTERAL Loads
Mirshad E M
Post Graduate Student Department of Civil Engineering
Sree Narayana Guru College of Engineering and Technology
Payyannur , Kannur , Kerala , India
Dr. Susan Abraham
Head of the Department Department of Civil Engineering
Sree Narayana Guru College of Engineering and Technology
Payyannur , Kannur , Kerala , India
Abstract In Industrial building to cover and shelter a large area without supports, different steel structural roofing system becomes the most effective and economical instead of a concrete structure. Pre engineering building (PEB) is new type of building framing system adopted in the industrial building, the concepts is steel framing system, supporting members and roof covering are connected each other. The aim of this research work is to optimize the bracings for Pre Engineering Building (PEB) and analyse the behaviour of structure under different loads by using Etabs software. Present study is to analyse and design a PEB structure for different bracing location and finding the best location using Etabs software.
Keywords PEB, Bracing
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INTRODUCTION
Industrial buildings, a subset of low-rise buildings is normally used for steel plants, automobile industries, utility and process industries, thermal power stations, warehouses, assembly plants, storage, garages, small scale industries, aircraft hangar, etc. . Mostly industrial buildings are constructed with steel material. Ordinary steel structure are made up of truss as a roofing system with roof top covering, it is called as conventional steel building (CSB). Technological improvement over the year has contributed immensely to the enhancement of quality of life through various new products and services. One such revolution was the pre-engineered buildings.
Pre engineering building (PEB) is new type of building framing system adopted in the industrial building, the concepts is steel framing system, supporting members and roof covering are connected each other. Pre-engineered steel buildings can be fitted with different structural accessories including mezzanine floors, canopies, fascias, interior partitions, etc. and the building is made waterproof by use of special mastic beads, filler strips, and trims. This is a very versatile building's systems and can be finished internally to serve many functions and accessorized externally to achieve attractive and unique designing styles. It is very advantageous over conventional buildings and is helpful in the low-rise building design. They PEB sections are used according to the bending moment requirement and are generally built up sections.
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OBJECTIVES
The industrialization leads to the development of new advancement in the construction of industries. Large column free area and lower cost enhance the use of PEB in industrial building construction. The main objectives of the study are
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To analyse and design a pre-engineered building
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To analyze PEB structure under wind load.
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To optimize the bracing for lateral loads.
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To compare and evaluate the effectiveness of steel brace at different location.
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SUMMARY OF LITERATURE REVIEW
From literature review, it is found that PEB have better performance compared to conventional steel structure and addition of bracing provide stability to the structure. They have good aesthetic view. In PEB the excess steel is avoided by tapering the section and is done as per the bending moment requirements in the structure. It is also seen that the weight of PEB depends on the Bay Spacing, with the increase in Bay Spacing up to certain spacing, the weight reduces and further makes the weight heavier.
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METHODOLOGY
Building Dimensions
40m x 100m
Type Of Roofing
G.I Sheet
Location Of Building
Bangalore
Bay Spacing for centre
7.727 m
Bay Spacing for gable end
7.500 m
Number of bays
13 No.
Wind Speed
33 m/s
Roof Slope
1in10
Clear eave height
5 m
Max eave height
7 m
Purlin Spacing
1.5 m c/c
Column Section(PEB)
Tapered
Rafter Section(PEB)
Tapered
The structure contain single storey PEB industrial warehouse. The plan is prepared using auto CADD. All the supports are pinned. Two types of models are analysed using ETABS software. The specification of structure are
Fig.1. Roof Plan
Fig 2. Elevation
Fig 3. Main frame section along grid 2 to 13
Fig 4. Main frame section along grid 1 to 14
Fig 5. Cross sectional view of various Tapered Sections assigned for PEB
TABLE 1. Section properties
Description
Taper 1
Taper 2
Taper 3
Taper 4
Depth of section at start node (mm)
400
800
700
900
Depth of section at end node (mm)
750
700
900
700
Width of top flange (mm)
300
350
300
300
Thickness of top flange (mm)
16
16
16
30
Width of bottom flange (mm)
300
350
300
300
Thickness of bottom flange (mm)
16
16
16
20
TABLE 2. Section properties
Member 1
Depth of section (mm)
700
Top flange width (mm)
300
Top flange thickness (mm)
16
Web thickness (mm)
8
Bottom flange width (mm)
300
Bottom flange thickness (mm)
16
Bracing: Box 100x100x8 mm
TABLE 3. Section properties
Purlin (cold formed Z section)
Web depth (mm)
230
Flange width (mm)
75
Thickness (mm)
2.6
Radius (mm)
21.4
Lip depth (mm)
20
Angle of lip (degree)
90
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MODEL 1
The first model of the study consists of the Pre-engineered building with bracing location as shown
Fig 6. 3D model
Fig 7. Deflection
Fig 8. Bending moment diagram
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MODEL 2
Fig 10. 3D model
Fig 11. Deflection
Fig 9. Base reaction
Fig 12. Bending moment diagram
Fig 13. Base reaction
TABLE 4. Load and load combinations
1
Dead
2
Collateral Load
3
Live
4
EL X
5
EL Y
6
WL 1
7
WL 2
8
WL 3
9
WL 4
10
0.9(DL+CL)-1.5ELX
11
0.9(DL+CL)-1.5ELY
12
0.9(DL+CL)+1.5ELX
13
0.9(DL+CL)+1.5ELY
14
0.9(DL+CL)+1.5RSX
15
0.9(DL+CL)+1.5RSY
16
0.9(DL+CL)+1.5WL1
17
0.9(DL+CL)+1.5WL2
18
0.9(DL+CL)+1.5WL3
19
0.9(DL+CL)+1.5WL4
20
1,5(DL+LL+CL)
21
1.2(DL+LL+CL)+0.6 WL1
22
1.2(DL+LL+CL)+0.6WL2
23
1.2(DL+LL+CL)+0.6WL3
24
1.2(DL+LL+CL)+0.6WL4
25
1.2(DL+LL+CL+ELX)
26
1.2(DL+LL+CL+ELY)
27
1.2(DL+LL+CL+RSX)
28
1.2(DL+LL+CL+RSY)
29
1.2(DL+LL+CL+WL1)
30
1.2(DL+LL+CL+WL2)
31
1.2(DL+LL+CL+WL3)
32
1.2(DL+LL+CL+WL4)
33
1.2(DL+LL+CL-ELX)
34
1.2(DL+LL+CL-ELY)
35
1.5(DL+CL)
36
1.5(DL+CL+ELX)
37
1.5(DL+CL+ELY)
38
1.5(DL+CL+RSX)
39
1.5(DL+CL+RSY)
40
1.5(DL+CL+WL1)
41
1.5(DL+CL+WL2)
42
1.5(DL+CL+WL3)
43
1.5(DL+CL+WL4)
44
1.5(DL+CL-ELX)
45
1.5(DL+CL-ELY)
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RESULTS
The different load combinations are applied and the base reactions, deflection, shear force and bending moments are obtained.
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MODEL 1
TABLE 6. Deflection
TABLE 5.Analysis result
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MODEL 2
TABLE 7. Analysis result
TABLE 8. Deflection
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CONCLUSIONS
The PEB is analyzed and designed under different load and load cases. The result shows that the bracing and its location has significant effect on the structure and its performance.
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REFERENCES