DESIGN OF A SIMPLE STEEL BUILDING Figure 1 shows a new steel building located in
ID: 1712657 • Letter: D
Question
DESIGN OF A SIMPLE STEEL BUILDING Figure 1 shows a new steel building located in a western suburb of Brisbane. This building has been in use for a few years relation to the use of imported steel sections for the main load carrying members of this building. There are uncertainties in relation to the steel grade used and design calculations, and thus on the structural safety of this building under severe storms like those experienced by Brisbanites in 2014. We are unable to locate the original design calculations and drawings. Hence there is a need to verify the adequacy of the steel structural system used in this building (see Figure 1). Attached project brief and figure provide the details of this steel structural system. Your group (four members) has been asked to investigate the structural adequacy of this steel structural system, and to recommend suitable structural improvements if found inadequate. The main beam (I-sections) shown in Figure 1 can be considered to be a series of steel beams with an overhang, and simply supported by two CHS columns. These beams are spaced at 10 m and their central span and overhang (without tapered section) are 15 m and 3 m, respectively. The secondary beams (Channel sections) that support the roofing system are spaced at 5 m as shown in the figure. These secondary beams can be considered to be simply supported at the ends. A series of purlins are attached to the top flange of the secondary beams at approximately 1 m spacing. The columns of 7 m height supporting the main beams are made of CHS. The structural steel sections used are considered equivalent to 610UB125 (main beams), 380PFC (secondary beams) and 219x8.2 CHS (columns), and their steel grade is considered to be only Grade 250 (yield stress fy 250 MPa) The design actions for the strength limit state of this building were calculated using Australian action codes. They can be considered as follows. . The permanent action due to the self-weight of roofing system is estimated as 0.10 kPa. . The imposed action on the roof shown in Figure 1 can be taken as 0.25 kPa . The wind action on the roof is generally uplift. This action is taken as 2.5 kPa. · The serviceability design wind action is 40% of that given for the strength limit state. now, however, some concerns have been raised recently inExplanation / Answer
1)
Members are Column, beam ( main and secondary beam) ,and purlins
connections are bolt connections' and simply supported.
load path is purlins to secondary beam to the main beam to the column to the foundation.
main load carrying members are main beams and columns.
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