Structural Design Specifications Questions

Serviceability limit for sway: the maximum horizontal deflection of a column of actual length L under lateral forces may be permitted up to what limit (order-of-magnitude design guideline)?

Concrete statistics: if Δ denotes the deviation of each individual test strength from the sample mean for n results, choose the correct expression for the sample standard deviation.

Reinforced concrete detailing: the cover to the main reinforcement may be reduced by up to one-third of the specified cover but not less than which absolute minimum?

For overall stability against overturning in structural engineering (e.g., retaining walls, shear walls, chimneys), the resisting weight or anchorage should provide a minimum restoring moment equal to what multiple of the overturning moment due to dead load alone?

For plain (unreinforced) concrete in sea water or in structures directly exposed to sea water (severe to very severe exposure), which minimum grade should be specified?

For reinforced concrete members immersed in sea water or exposed to heavy sea spray (adverse marine conditions), what is the maximum permissible nominal cover to reinforcement?

For webs of standard steel sections, identify the incorrect statement about gross web area definitions for rolled I-beams, channels, and plate girders.

A solid slab has overall depth 20 cm and effective depth 15 cm. What is the maximum permissible horizontal spacing between parallel main reinforcement bars in the slab?

For steel compression members, the maximum permissible slenderness ratio for single-angle discontinuous struts connected by a single rivet or bolt is limited to which value?

A 24-hour load test is performed on a flexural member. If l is the effective span in metres and D is the overall depth in mm, acceptance requires the measured maximum deflection (in mm) to be less than which expression?

In reinforced concrete beams, bars are not to be bundled in direct contact if the bar diameter exceeds which limit?

For 15 cm cube compressive strength at 7 days, what should be the minimum ratio f7(M 20) : f7(M 40) expected from standard curing and testing?

For exposed concrete surfaces, what is the minimum duration of moist curing typically specified to achieve adequate early hydration and durability?

In reinforced concrete compression members (columns), what is the minimum lap splice length for a bar, expressed as a multiple of bar diameter φ, as per standard detailing practice?

In concrete mix classification for reinforced concrete design, which grade is generally not used for reinforced concrete (R.C.C.) structural members?

For reinforced concrete columns under axial load with inevitable eccentricity, the design eccentricity shall be taken as the distance from the assumed load application point to the centroid of the section, subject to a minimum of how many millimetres?

In steel fabrication using fillet welds, the permissible gap between flange plates and web plates should not exceed which maximum value?

In steel beam behavior, the dispersion of load from the flange into the web is commonly assumed to spread uniformly at what angle θ to the flange plane?

For a simply supported reinforced concrete beam where the ratio of effective span l to overall depth D is ≥ 1 and ≤ 2, what lever-arm approximation should be used for design?

For a riveted joint not exposed to weather, what is the recommended distance from the rivet line to the nearest plate edge, expressed as a multiple of the thickness t of the thinner outside plate?