A Comparative Study on Performance of Conventional and Pre-Engineered Steel Frames Subjected to Crane Load

Abstract

Conventional steel frames are low rise steel frames with roofing systems of truss and roof coverings. Standard hot rolled sections are used for truss elements which are usually much heavier than what is actually required as per the design. Pre–Engineered steel frames are the steel frames in which excess steel is tapered as per the bending moment requirements. In present study, conventional (pratt type) steel roof truss and pre-engineered (portal type) steel roof frame with crane load is considered for an industrial warehouse construction located in Davangere city. 2D Modelling of both conventional and pre-engineered steel frame with crane load is done using STAAD Pro. software. Both the steel frames are subjected to different combinations of Dead load (DL), Live load(LL), Crane Load(CL) and Wind load(WL) as per IS 800 (2007) codal provisions. For the factored bending moments and shear force, referring IS 800 (2007) codal provisions, crane gantry girder is designed as a laterally unsupported member having a combination of I and channel sections. The members of both conventional and pre-engineered steel frames with crane load are designed for the worst load combination as per IS 800(2007) codal provisions. It is concluded that about 25% reduction in quantity of steel can be achieved by choosing pre-engineered steel frame than the conventional steel frame.

Introduction

I. INTRODUCTION

Steel is one of the most commonly used building materials, as it plays the most prominent role especially in industrial sector and where there is a need of faster rate of construction over a huge area. Industries require larger area as there is a usage of  heavy equipment and machines. Even steel structures are used to transport the goods from one place to another within the warehouse by using cranes. As steel is strong, hard, and ductile and fire resistive material, it is very suitable for rapid construction especially in industrial sector. One more advantage of steel structures is it can be easily dismantled and shifted to anywhere around the site. Design of steel structures contains design of secondary members like bracings, tie rods, column base, purlins etc. Roof truss used in factories, cinema halls, transmission towers, chimney, warehouses, railways, crane girder, bridges etc. Are some of the steel structures. In the present study, both csb and peb frames are considered subjected to crane load. Dead load(dl), live load(ll), wind load(wl) and different load combinations are applied and designed both the frame for the worst load combinations. Crane load is also calculated by manual calculations and added to the supporting columns. Last part of the paper depicts the quantity of steel required for both the frames and the comparison between the cost. The paper aims at explaining the advantages of using peb over csb.

II. PROBLEM STATEMENT

In the present paper, conventional (i.e. Pratt truss) and Pre–Engineered (i.e. portal type) industrial steel frames subjected to crane load are considered for an industrial building located at Davangere City. Dead Load (DL), Live Load (LL), Crane Load(CL) and Wind Load (WL) are applied on both the frames as per IS 875–Part 1 (1987), IS 875–Part 2 (1987) and IS 875–Part 3 (2015) codal provisions respectively. The developed 2D models are analysed using STAAD Pro. software for various load combinations as specified by IS 800 (2007) codal provisions. The members of both the frames are designed for the worst load combination as per IS 800 (2007).

The total mass of steel required for both the conventional and Pre–Engineered steel frames(except the mass of connections, purlins and crane) is calculated and cost comparison is made to check the economy achieved in using Pre– Engineered steel frames over the conventional steel frames.

III. PARAMETERS CONSIDERED FOR MODELLING

Conventional and Pre–Engineered steel frames suitable for Davangere city is considered for modelling in STAAD Pro. software. Table 1 shows the details of conventional and Pre–Engineered steel frames subjected to crane load. Figure 1 shows the plan details of Conventional and Pre–Engineered steel frames.

Figure 15 shows the graphical representation of the quantity of steel required for both the frames.

Conclusion

It is observed that about 25% reduction in quantity of steel is achieved by choosing pre-engineered steel frame than the conventional steel frame. As per the current market rate, the price of steel is assumed to be around Rs. 85 per kg. Hence the cost of steel (except the mass of connections, purlins and crane gantry girder) required to erect both conventional and pre-engineered steel frames subjected to crane load is graphically represented

References

[1] SP 6–1 (1964), “Structural Steel Sections”, Bureau of Indian Standards, New Delhi, India. [2] IS 456 (2000), “Indian Standard Code of Practice for Plain and Reinforced Concrete”, Bureau of Indian Standards, New Delhi, India. [3] IS 800 (2007), “Indian Standard Code of Practice for General Steel Construction”, Bureau of Indian Standards, New Delhi, India. [4] IS 875–Part 1 (1987), “Indian Standard Code of Practice for Design Loads (Other than Earthquake) for Buildings and Structures. Part 1 Dead Loads – Unit Weights of Building Materials and Stored Materials”, Bureau of Indian Standards, New Delhi, India. 56 [5] IS 875–Part 2 (1987), “Indian Standard Code of Practice for Design Loads (Other than Earthquake) for Buildings and Structures. Part 2 Imposed Loads”, Bureau of Indian Standards, New Delhi, India. [6] IS 875–Part 3 (2015), “Indian Standard Code of Practice for Design Loads (Other than Earthquake) for Buildings and Structures. Part 3 Wind Loads”, Bureau of Indian Standards, New Delhi, India

Copyright

Copyright © 2022 Dhanya M S, Dr. Chidananda G. 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.