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Questions Related to Structural Steel

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1. Describe the steps used for erection of structural steel?
Material received at site
Concrete bases and anchor bolts
Shims
Pre assembly at ground level
Main construction steel erection (dimension bolt)
Tightening for anchor bolt
Alignment for structural steel
Tightening for steel
Tightening for anchor bolts.
Grouting
Complete structural steel erection (secondary beams, bracing)
Calibration of whrench and device
Modification during and after erection includes cutting, welding, NDT,….etc)
Painting inspection
2. What are the defects you can except during inspection of material receving at the site?
Lamination, distortion, pitting
3. Mention the steps to check material received at the site?
1.Visual inspection
2.Dimension inspection
3.Verification of heat no and mill certificate information’s
4. How can you check the support foundation ? (location, orientation, elevation)
1.Location
2.Orientation
3.Elevation
5. What is the minimum top elevation of leveling shims?
Minimum  25mm
6. What is the acceptable variation in dimensions between the centers of two anchor bolts (within an anchor bolt group) ?
Maximum 3 mm
7. Which code you can use for check bolts used for primary structural connection?
ASTM A325 N

8. What is the minimum size of bolt used at ASTM A32 N ?
Minimum size 20mm
9.How much variation in elevation  of the top of anchor rods?
Max 13 mm
10.How many days minimum required to archive 70% concrete strength (curing time) ?
7 days minimum
11.How many bolts minimum required per connection ?
2 bolt minimum required
12.How much variation in dimension from center of any anchor bolts group to be establish coloumn line through the group ?
Equal to or less than 6mm
13.Which code you can use for welding of structural steel?
AWS D1.1
14.What are the types of joints you can use for erection of structural steel?
Snug-tightened joint. Pretension join or slip critical joint.

15 What is minimum thickness of any part of structural steel shape?
Minimum 5 mm
16.What is the vertical tolerance (alignment) for straight compression structural member?
1 mm per 1m accepted
17.What are the types of methods of bolt tightening?
Snug tightening, turn of nutpreten sioning calibrated wrench pretensioning or direct-tension indicator pretensioning
18.Complete, all bolts, nuts and washers shall be properly identified and marked with …………..
Material  grade, manufacture’s logo
19.All nuts for high strength bolts shall be …………. to reduce to torque installation .
Wax – dipped
20.All gusset and stiffener plates shall be …………..mm  minimum  thickness
10 mm minimum
21.What is the minimum height of handrails provided on walkways and platforms ?
Over 1 meter heigh
22.Complete, standard bolt holes shall not be enlarge by more than ……………. mm to make connection resulting from minor mislit
1mm

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2 Comments on "Questions Related to Structural Steel"

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Marn Steel
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Marn Steel
3 years 3 months ago

Very effective service an internationally as a Oil, Gas & structural company.

Bob Lowe
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Bob Lowe
3 years 4 months ago

Thanks for the information. These are some great question and answers. It is good to know that some defects will come from the factory or from shipping and that it is normal. I think it is really important that you perform a check on each item of material that you receive. Like you mentioned, verification of heat no. and a mill certification are important.

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