Blog

A 5/8 in. x 10 in. plate must resist a service dead load of 52 kips and a service live load of 51 kips in tension. The plate is connected to a gusset with eight 7/8 in. bolts. Standard sizing is used for the bolt holes. The steel is ASTM A572 Grade 42: Fy = 42 ksi, Fu = 60 ksi. Assume that Ae = An. Using ASD, does the plate have enough strength?

The current Steel Construction Manual incorporates both LRFD and ASD.

What is the effective hole diameter to accommodate a 1-1/4 in. bolt? Use oversize hole sizing.

The Steel Construction Manual color codes LRFD design strength values as _______.

In LRFD, the load factor for the rain load in load combination 2 is ____.

What does LRFD stand for?

A flat roof is subject to the following uniformly distributed loads: a dead load of 33 psf (pounds per square foot of roof surface), a roof live load of 13 psf, a snow load of 17 psf, and a wind load of 26 psf downward. If ASD is used, determine the required load capacity (required strength), Ra.

A beam is part of the framing system for the floor of an office building. The floor is subjected to both dead loads and live loads. The maximum moment caused by the service dead load is 64 ft-kips, and the maximum moment for the service live load is 55 ft-kips (these moments occur at the same location on the beam and can therefore be combined). If ASD is used, what is the required nominal strength of the beam for a safety factor Ω of 1.70?

A 1/2 in. x 10.0 in. plate is connected to a gusset with six 1/2 in. bolts. Standard sizing is used for the bolt holes. The steel is ASTM A36: Fy = 36 ksi, Fu = 58 ksi. Assume that Ae = An. Compute the design strength for LRFD.

Plain carbon steels have higher strength and lower ductility than low-alloy steels.