Structure Engineering notes for GATE and PSUs - part 11

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How have you been? Here is our next part for your preparation of GATE and PSUs examinations.

• The allowable tensile stress in structural mild steel plates for steel tank is assumed as 105.5 MPa on net area.
• Steel tanks are mainly designed for water pressure.
• Box type sections should preferably by used at places where torsion occurs.
• The capacity of the smallest pressed steel tank is 1950 litres.
• The bracing between two columns of a steel tanks will be designed to resist horizontal shear due to wind or earthquake + 2.5% of column loads.
• The minimum thickness of plates in a steel stack should be 6 mm.
• Maximum pitch of rivets, used in steel stacks, is limited to 10t, where t is the thickness of the thinner plate being connected.
• The diameter of base of conical flare of a steel stack is more than d, where d is the diameter of the cylindrical part.
• Hudson's formula gives the dead weight of a truss bridge as a function of bottom chord area.
• If the loaded length of span in metres of a railway steel bridge carrying a single track is 6m, then impact factor is taken as between 0.5 to 1.0.
• If the floor is supported at or near the bottom but top chords of a bridge are not braced, then the bridge is called half through bridge.
• The centrifugal force due to curvature of track is assumed to act on the bridge at a height of 1.83 m above the rail level.
• The effect of racking forces is considered in the design of lateral braces.
• When the secondary stresses are taken into account along with primary stresses, then the allowable stress is increased by 96/3%.
• The portal bracing in a truss bridge is used to transfer load from top of end posts to bearings.
• The sway bracing is designed to transfer 50% of the top panel wind load to bottom bracing.
• The bracing provided in the plane of the end posts is called portal bracing.
• The portal bracing is designed for wind force + 5/4% of the compression force in two end posts.
• The pin of a rocker bearing in a bridge is designed for bearing, shear and bending.
• The least dimension in case of a circular column of diameter D is taken as 0.88D.
• In case of timber structures, the form factor for solid circular cross-section is taken as 1.18.
• In case of timber structures, the simple bending formula M-f.z may be applied for rectangular beams up to 300 mm depth.
• The elastic strain of the steel is about 1/12 strain at the initiation of strain hardening and 1/200 of maximum strain.

All information is learned through books and practical exercises.

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