Example 6.14. The central bottom chord member of roof truss is 4 m long, carries an axial tension 250 kN and supports a moveable differential chain hoist of 4 kN capacity including impact. The member is composed of 2 angles 100 mm x 75 mm x 10 mm @ 13 kg/m with the longer legs up and placed back on either side of 10 mm gusset plates. The outstanding shorter legs at the bottom provide necessary track for the hoist. The angles are tack riveted at1 m centers with 20 mm dia. rivets. Check the efficiency of the section provided. The permissible tensile stress in axial tension and bending are 150 MPa and 165 MPa respectively. The permissible stress in compression for flangeless beams unsupported laterally may be taken as Fram wiki 3300 N/mm, subject 1/b to a maximum of 140 N/mm, where l = unsupported length of the member and b is the combined thickness of the angles.

Example 6.14. The central bottom chord member of roof truss is 4 m long, carries an axial tension 250 kN and supports a moveable differential chain hoist of 4 kN capacity including impact. The member is composed of 2 angles 100 mm x 75 mm x 10 mm @ 13 kg/m with the longer legs up and placed back on either side of 10 mm gusset plates. The outstanding shorter legs at the bottom provide necessary track for the hoist. The angles are tack riveted at1 m centers with 20 mm dia. rivets. Check the efficiency of the section provided. The permissible tensile stress in axial tension and bending are 150 MPa and 165 MPa respectively. The permissible stress in compression for flangeless beams unsupported laterally may be taken as Fram wiki 3300 N/mm, subject 1/b to a maximum of 140 N/mm, where l = unsupported length of the member and b is the combined thickness of the angles.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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