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Statement (I): In pin-jointed roof trusses, purlins are kept above nodes in the top chord.

Statement (II): The top chord is continuous through the nodes of the truss. 


1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true

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Correct Answer - Option 2 : Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Statement I: True

Purlins are beams used on trusses to support the sloping roof system between the adjacent trusses. They are placed in an inclined position over the main rafters (top chord) of the trusses.

To avoid bending in the top chord, it is theoretically desirable to place purlins at panel points however; they are placed at very closed intervals for the economic point of view.

They may be designed as simply supported by considering maximum BM to be WL2/8 and may be designed as continuous by considering maximum moment be WL2/10.

Statement II: True

Typical components of a truss  are shown in the following figure:

Components

Functions

Struts 

Stiffen the bridge laterally

Portal Bracing

Transfer the wind and seismic load from the top of end posts to bearing.

Bottom Floor Beams

Resist the Load coming from bridge deck up to some extent by bending action  and remaining load  gets transferred to bridge piers

Top and Bottom Lateral Bracings

Prevent the buckling of the top chord and bottom chord respectively. The top chord is continuous through the nodes of the truss.

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