Abstract
Majority of steel structures are used for low-rise single storey buildings mainly for industrial purpose. Steel structures are preferred for industrial buildings due to its higher strength to weight ratio as compare to RCC structures and steel structures also gives more free internal space by allowing long clear span between columns. Pre-engineered building (PEB) is a modern age concept of utilizing structural steel and optimizing the design by ensuring the economical integrity of the structure. The structural members are designed and fabricated in the factory under controlled environment to produce optimum sections by varying the thickness of the sections along the length of the member as per the bending moment requirement. The aim of the research paper is to analyses and design a PEB car showroom of two storey (G+1) using STAAD Pro in accordance to British standards (BS 5950-1:2000) and Euro codes (EC3 EN-1993-1) with wind and seismic analysis. In order to achieve the above aim of the project, two models of the car showroom were created namely British Standard (BS) model and Euro code (EC) model using STAAD Pro. The member property for BS model is assigned with tapered frame sections while the EC model is assigned with universal standard section frames. The load cases were assigned to the models for analysis include dead load, live load, wind load and seismic load. Wind load and seismic load being the critical dynamic loads that will be analyzed for the stability of the structure against lateral forces. The results from the analysis and design of the two models were within the allowable limits for ultimate and serviceability limit state since the internal stresses in all the members satisfies the unity check ratio requirements for both design codes. The dynamic analysis results suggest that EC model has higher resistance to seismic loading as compare to BS model since the maximum displacement with time in X-direction for EC model is 8.83 mm and for BS model is 10.5 mm. The total weight of the structure for BS model is 1125.431 kN and for EC model is 1214.315 kN, which makes EC model 7.9% heavier than BS model. Moreover, the total weight of all the portal frames for BS model is 457.26 kN and for EC model is 574.725 kN, which makes tapered frame sections to utilize and reduce the amount of steel by 25.7%. Therefore, BS model proved to be an economical model when compared to Euro code.
Highlights
IntroductionSteel buildings are not known for high rise structures but instead majority of steel structures are low rise with
The amount of steel used for standard sections for all the portal frames in Euro code model is 25.7% more than the amount of steel that was used for all tapered frame sections in British standard model
The peak wind pressure was calculated as 1.78 kN/m2 by using a basic wind speed of 35 m/s based on British Standard (BS) EN 1991-1-4:2005 and seismic analysis was done by time history method using El - Centro data
Summary
Steel buildings are not known for high rise structures but instead majority of steel structures are low rise with. Oman is a well-developed country and its economy mainly depended on exporting petroleum products, but as the country is facing economic crisis due to depletion of crude oil reserve, the country tends to divert its economical vision toward boosting the business sector. This only means that more industries and factories are required to manufacture local products and to export them in order to stabilize the economy of the country. This encourages construction of Pre-engineered building in the country for both small and large scale industries
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