A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building

IJIRST –International Journal for Innovative Research in Science & Technology| Volume 3 | Issue 10 | March 2017 ISSN (online): 2349-6010

A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building Hemant Sharma Assistant Professor Department of Civil Engineering K. J. Institute of Engineering & Technology, Savli, Vadodara Gujarat India

Abstract In this case study I have analyzed, Designed and compared the pre-engineered industrial building with the conventional building by mainly comparing the bending moments at different sections. Also I have considered different components of the pre-engineered steel building. To design and analysis the PEB and CSB I have used Staad pro v.8 as well as Indian standard codes. And finally I have compared these two structures in terms of Economy and Time saving of construction. I have tried many truss systems for cladding and roofing system purpose. In the analysis I have analyzed and designed the Purlins, Girts, Eave Struts and Bracings etc.

For the design I have considered Dead Load, Live Load and Wind Load for the location of Vadodara, Gujarat as per IS Code consideration.

Keywords: Pre-Engineered Building, Conventional Building, Staad Pro, Analysis, Design, Comparison _______________________________________________________________________________________________________ I. INTRODUCTION Pre-Engineered Building (PEB) concept involves the steel building systems which are predesigned and prefabricated. The basis of the PEB concept lies in providing the section at a location only according to the requirement at that spot. The sections can be varying throughout the length according to the bending moment diagram. This leads to the utilization of non-prismatic rigid frames with slender elements. Tapered I sections made with built-up thin plates are used to achieve this configuration.

Conventional steel buildings (CSB) are low rise steel structures with roofing systems of truss with roof coverings. The selection criterion of roof truss also includes the slope of the roof, fabrication and transportation methods, aesthetics, climatic conditions, etc. Several compound and combination type of economical roof trusses can also be selected depending upon the utility. Standard hot-rolled sections are usually used for the truss elements along with gusset plates.

Purpose The purpose of this study is to mainly compare the techniques of engineering now a day. Also the requirement of this study is to study the benefits and application of the pre-engineered industrial buildings. Also the purpose of this study is to minimize the time of construction of industrial building. So that construction rate can be increased. Also the overall cost of the building will be less.

After studying this one can be able to provide the building with large clear span and low maintenance cost as well. The erection rate will be faster and the roofing system will be energy efficient.

Use of Pre-Engineered Building The application of pre- engineered building is of wide range. It is mainly used in Industrial and Commercial building. It can be also used in institutional building, aviation and military purpose.

Mechanisms of Pre-Engineered Building The pre-engineered building and conventional building are mainly compared on the basis of Bending moment and Overall Deflection of the structure. The analysis and design has been completed in Staad Pro and with reference to the Indian Standard codes.

Components of Industrial Steel Buildings Typical assembly of a simple steel building system is shown below to illustrate the Synergy between the various building components as described below:  Primary components  Secondary components  Sheeting (or) cladding  Accessories

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A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building (IJIRST/ Volume 3 / Issue 10/ 013)

II.

METHODOLOGY

This Pre- Engineered Building has been designed in Staad pro and Used Limit state method. The Indian Standard Codes used are Is:800-2007, IS 875 (Part – I, II & III) – 1987. For the wind load design IS 875 part 3 has been used.

III. ANALYSIS & DESIGN Industrial Building Data Type of the Building Width

: :

Clear Span -CS 20.0 m C/C

Length

:

18 m C/C

Eave Height Roof Slope

: :

8m 8º

Distance to Ridge

:

9.56m

Main Frame Column Spacing Bay Spacing

: :

4 @ 5m 3 @ 6m

End Wall Type End Wall Column Sp acing

: :

Post & Beam 4 @ 5m

Fig. 1: Geometry of in Dustrial Steel Building Con Sidered as Example

Load Cases In this example, Static loads i.e., Dead loads and Live load are considered as per IS 875 (Part – I & II) – 1987.

Dynamic loads i.e. Wind load is considered as per IS 875 (Part - III) - 1987.

Static loads - (As per IS 875 (Part I & II) – 1987 a) Calculation of Dead Load  Dead load = 0.15 kN/m²  Bay spacing = 6 m  DL per meter = 0.9 kN/m  Calculation of Live Load:  Live Load = 0.75 kN/m²  Bay spacing = 6 m  LL per meter = 4.5 kN

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A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building (IJIRST/ Volume 3 / Issue 10/ 013)

Dynamic loads – (As per IS 875 (Part – I & II) – 1987) a) Calculation of Wind Loads For the calculation of wind loads following data have been adopted.

Max Bay Spacing: 6 m with Roof Slope 8º Location for Wind: Vadodara, GIDC (Basic wind speed= Vb= 44m/s) In this example, building is considered to be open terrain with well scattered obstructions having height less than 10 m with maximum dimension more than 50 m and accordingly factors K 1, K2, K3 have been calculated as per IS 875 Part III (1987).

Terrain Category- 2 Class- B K1- Probability factor- 1.0, K2- Terrain, height and size factor- 0.98, K3- Topography factor- 1 1) Design Wind Speed Vz = (K1 X K2 X K3) X Vb 2) Design Wind Pressure, P : P =O.6 (Vz)² kN/m² Ratio- H/W=0.4, L/W= 0.9 3) Wind Pressure Coefficients LExternal and Internal wind coefficients are calculated for all the surfaces for both pressure and suction. Opening in the building has been considered less than 5% and accordingly internal coefficients are taken as +0.5 and -0.5.

Fig. 2: Load Combinations

The external coefficients and internal coefficients calculated as per IS 875 Part III (1987).

Wind load on individual members are then calculated as below.

F= (Cpe - Cpi) x A x P Where, Cpe, Cpi are external coefficients and internal coefficients respectively and A and P are Surface Area in m² and Design Wind Pressure in kN/m² respectively.

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A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building (IJIRST/ Volume 3 / Issue 10/ 013)

IV. DIMENSIONS OF TAPERED COLUMN

Fig. 3: Dimensions of Tapered Column

Comparison of Mom ENTS & Shear force For PEB & CSB

Fig. 4: Comparison of Mom ENTS & Shear force For PEB & CSB

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A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building (IJIRST/ Volume 3 / Issue 10/ 013)

Fig. 5: Comparison of PEB & CSB Bending Moment

Cost comparison & Conclusion The Weight of PEB and conventional industrial building is calculated after the final design. Table 3 gives the weight of plane frame Pre-Engineered building. In these tables column 1 shows the sections used. Column 2 shows the overall length of the members and column 3 shows the calculated weight.

Similarly, Table gives the weight of conventional building in which column-1 consists of members of same cross sectional properties. Column 2 and column 3 shows the sizes of the m embers and their length. As it seen in the Fig, PEB structure is designed for a clear span of 20m with column in between, as in case of conventional building, where it is not possible to provide a clear span truss and hence an interior column is provided. The conventional frame is designed using multi span truss, which is generally used for long span trusses. Results of both PEB and Conventional buildings are tabulated in the Table respectively. It can be noticed that, even though PEB structures provides clear span, it weighs minimum 27% - 30% lesser than that of conventional buildings.

Calculation of Steel for PEB and CSB Table - 1 Weight of Total Structural Steel Sections for PEB Profile Length (Meter) Weight(KN) Tapered member 1 137.36 202.069 Tapered member 4 20.24 24.805 FR ISMC 400 54.00 52.210 Tapered member 38 20.24 11.406 TOTAL 290.489 Table - 2 Weight of Total Structural Steel Sections for CSB Profile Length (Meter) Weight(KN) ST ISWB 600A 128.00 181.810 ST ISA 130X130X12 90.73 20.785 ST ISA 150X150X15 158.47 104.155 FR ISMC 400 162.00 156.629 Total 463.379

V. CONCLUSION OF THE STUDY After doing detailed analysis of PEB and CSB, there observed 37% overall material saving & cost reduction in PEB compared to CSB. REFERENCES [1] [2] [3] [4]

Dr. N. Subramanian, “Design of Steel Structures”.

S. Jagadesh kannan, V. Vanitha, “Comparison of Various Types of Roofs in PEB”, International journal of Engineering Trends and Technology (IJETT) – Volume 22 Number 8 – April 2015.

S.D. Charkha, Latesh S. Sanklecha, “Economizing Steel Building using Pre-engineered Steel Sections”, International journal of Research in Civil Engineering, Architecture & Design Volume 2, Issue 2, April-june, 2014, pp. 01-10.

Pradeep V., Papa Rao G., “Comparative Study of Pre Engineered and Conventional Industrial Building”, International journal of Engineering Trends and Technology (IJETT) – Volume 9 Number 1 – March 2014.

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A Comparative Study on Analysis & Design of Pre-Engineered & Conventional Industrial Building (IJIRST/ Volume 3 / Issue 10/ 013) [5] [6]

Aijaz Ahmad Zende, Prof. A. V. Kulkarni, Aslam Hutagi, “Comparative Study of Analysis and Design of Pre-Engineered Buildings and Conventional Frames”, IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) ISSN : 2278-1684 Volume 5, Issue 1(Jan. – Feb. 2013), pp 32-43 .

Shrunkhal V. Bhagatkar, Farman Iqbal Shaikh, Bhanu Prakash Gupta, Deepak Kharta, “A Study On Pre-Engineered Building – A Construction Technique”, International journal of Research and Applications, ISSN :2248 - 9622, Vol. 5, Issue 3, (Part-2) March 2015, pp.

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