A Beginner's Guide to ASCE 7-10

Chapter 3 - D: Dead Loads

© 2012, T. Bartlett Quimby

BGASCE7-10 Section 3.3

Homework Problems

Last Revised: 11/04/2014

The homework problems reference the BGSE drawing sets.

Miscellaneous Steel Problems

Problems M3.1:   For the roof system shown in MISCDET_STL S6.1, the building width is 30 ft, the beams are W14x22 @ 6'-0" O.C., the reinforced concrete slab is 4" thick, and the roofing consists of a built-up system that includes 4" of rigid insulation and a membrane over the insulation.  A light weight suspended ceiling hangs from the roof system. 

Problem M3.1a:  Determine the average unit dead load for the roof system.
Problem M3.1b:  Draw a beam loading diagram for a typical roof beam showing only the applied dead load.

Dormitory Building Design Problems

Problem D3.1:  On the second and third floor framing plan (DORM S1) you will notice several regions that have beams in a repetitive pattern.  These beams are referred to as joists.  The floor plan has four different joist specifications:  J201, J202, J203, and J204.  The table below has some semi-randomly chosen sizes (i.e. they have not been designed yet, so these are just a guess!).  Assume that the floor slab is covered by an industrial carpet.  Interior walls are not likely to be rearranged over the life of the building and weigh approximately 10 lbs per square foot of wall surface area.  An acoustic suspended ceiling is hung from the floor above in each space.  The ceiling spaces over corridors are likely to see significant piping and wiring.

Joist	Size	Spacing	Unit DL
J201	W14x22	4'-0" O.C.
J202	C8x11.5	3'-6" O.C.
J203	W14x26	3'-0" O.C.
J204	C6x8.2	2'-0" O.C.

Complete the above by computing the unit DL for each area supported by the indicated joist.  Include a neatly drawn sketch of the a typical floor section in your computations.

Problem D3.2:  On the roof framing plan (DORM S2) you will notice several regions that have beams in a repetitive pattern.  These beams are referred to as joists.  The floor plan has four different joist specifications:  J201, J202, J203, and J204.  The table below has some semi-randomly chosen sizes (i.e. they have not be designed yet, so these are just a guess!).  Assume that the roof slab is 4" thick and is covered by 6 inches of rigid insulation, a waterproof membrane and 1" thick concrete pavers.  An acoustic suspended ceiling is hung from the floor above in each space.  The ceiling spaces over corridors are likely to see significant piping and wiring.

Joist	Size	Spacing	Unit DL
J401	W12x19	4'-0" O.C.
J402	C6x8.2	3'-0" O.C.
J403	W16x31	3'-6" O.C.
J404	C6x8.2	2'-6" O.C.

Complete the above by computing the unit DL for each area supported by the indicated joist.  Include a neatly drawn sketch of the a typical floor section in your computations.

House Design Problems

Problem H3.1:  Determine the average unit dead load for:

Problem H3.1a:  the high roof (between grids 1 and 2).  Assume that the roof trusses are spaced 2'-0" O.C.
Problem H3.1b:  the second floor between grids 1 and 2.  Assume that the floor joists are 2x10s at 16" O.C.
Problem H3.1c:  the first floor between grids 1 and 2.  Assume that the floor joists are 2x8s at 16" O.C.

Problem H3.2:  Determine the average unit dead load for:

Problem H3.2a:  A typical exterior wall.  Assume that the wall studs are 2x6s at 16" O.C.
Problem H3.2b:  A typical interior wall.  Assume that the wall studs are 2x4s at 16" O.C.