Steel-structures Questions Set 7:
Effect on concrete when water content decreases?
Solution:
A column member of length l, which cannot sway, has a rigid foundation at its bottom and is held with heavy beams at the top. The effective length of the column is:
Solution:
The nominal bearing strength of a bolt is given by the formula:
Vpb = 2.5 kb d t fu
Where kb depends on which of the following factors?
Solution:
In a fillet weld, the direct shear stress and bending tensile stress are 50 MPa and 150 MPa respectively. As per IS:800 2007, the equivalent stress (in MPa up to two decimal places) will be _________.
Solution:
A diamond section with unequal diagonals, the shorter being b and longer h, is used as a beam. If the shorter diagonal is placed parallel to the XX-axis, the shape factor of the section will be:
Solution:
Calculate the design wind speed for a site in a city with a basic wind speed of 50 m/s, risk coefficient = 1, topography factor = 1, the terrain has closely spaced buildings, and the height of the building (class A) is 15 m.
Solution:
A mild steel flat subjected to a tensile force of 84 tonnes is connected to a gusset plate using rivets. If the forces required to shear a single rivet, to crush the rivet, and to tear the plate per pitch length are 5,000 kg, 8,000 kg, and 6,000 kg respectively, then the number of rivets required is:
Solution:
A strut in a steel truss is composed of two equal angles ISA 150 mm × 150 mm with a thickness of 10 mm, connected back-to-back to the same side of a gusset plate. The cross-sectional area of each angle is 2921 mm2, and the moment of inertia (Ixx = Iyy) is 6335000 mm4. The distance of the centroid of the angle from its surface (Cx = Cy) is 40.8 mm. What is the minimum radius of gyration of the strut?
Solution:
Consider the following stipulations in designing a laced column:
1. Single lacing systems on opposite planes shall preferably be in the same direction so that one is the shadow of the other.
2. Lacing bar can be a flat or angled section.
3. The slenderness ratio of the lacing bars for compression shall not exceed 145.
4. Laced compression members are to be provided with tie plates at ends.
Which of these observations is/are correct?
Solution:
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