These truss structures are provided in warehouses, stores etc. In the case of this project an industrial warehouse was needed to be designed in the Butwal. The design and analysis has been done in etabs. Also, the joints in a truss are seen as revolute, which means that the torsional forces are excluded. Lastly, there are various kinds of trusses that can be used like the kingpost truss, wanem truss, pratt truss, howe trusss and many more.
At the end of this project we hoped to designed the truss structure stable and safe to provide the required open space. Design inputs and parameters: 1. Steel Sections The steel sections used for the designs are different sections available in market from Jagdamba steels. The steel sections mainly used here are: 1. For column: Hollow rectangular column of width 6.
For Truss Members: Hollow circular members of diameter mm and thickness of 3. For Purlins: Hollow circular members of diameter mm and thickness of 3. Loadings The main loadings in the steel truss are the wind loads and live load on the roof.
Basic wind speed Vb : The basic wind speed for our project site in Butwal is referenced form the Indian City nearest to it, which is Gorakhpur. K2 terrain, height and structure size factor : Only the terrain category and structure class obtained from structure size factor is needed.
The structure class is B The terrain Category is Category 2 4. Conclusion The truss designed for the space of m2, in Butwal, in an industrial area was designed as a Kingpost truss. The obtained dimensions of the truss structure are written above. Related Papers. By Mayank Barser. By hasyim asari. Estimate external loads to be applied including self weight of truss, purlins and roof covering together with wind loads. Determine critical worst combination loading.
It is usual to consider Dead loads alone and then Dead and Imposed loads combined. Analyze the frame work to find forces in all members. Select material and section to produce in each member a stress value which does not exceed the permissible value. Particular care must be taken with compression members struts or members normally in tension but subject to stress reversal due to wind uplift.
For span up to about As a guide the spacing of the roof trusses can be kept : a. C sheet -1 in 12i. Trapezoidal trusses: The configuration shown below reduces the axial forces in the chord members adjacent to supports. Economical span to depth ratio is around Fan trusses are used when the Rafter members of the roof trusses have to be subdivided into ODD number of panels.
The roof slope is normally chosen to or depending on type of roofing. A slope less than should be used with caution since the deflection decreases the inclination and if the actual roof slope becomes too small trouble with water run-off can give problems with water accumulation Ponding.
The smallest possible slope depends on the size of the snow load. In the practice of designing industrial and residential buildings, the most frequent case is use of support diagonals upwards. Triangular trusses are employed only in roofs with steep pitches.
Self weight of truss: Various Handbooks and text book furnish different formulae for the self weight of steel truss. One has to make use of it judiciously and with engineering judement.
Welded sheeted roof trusses is given approximately as: A. Mukhanov-MIR publication. The Minimum weight of truss is approximately obtained when the weight of the chords equal to that of the lattice including the gusset plate which will be the case with comparatively large truss depth to span ratio.
Element of steel frame work 1. Steel Roof Truss Tutorial. Roof Design. Steel Roof Sheeting Gutters Tender. Introduction to Steel Roof Trusses.
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