Skip to main content

Roof diaphragm


From this plan of a simple wood frame structure (1-story height), what is the maximum chord force at the east and west edges of the roof diaphragm if 110 lbs/foot lateral wind load is exerted as shown?

A. 18,340 lbs
B. 367 lbs
C. 3,670 lbs
D. 4,600 lbs

AnswerD. 4,600 is correct. The lateral wind load here is similar to a uniform load acting on a simple beam turned on its side. To find the maximum chord force at the edges of the diaphragm, use the equation for maximum moment wl²/8 ÷ building plan depth. 110 lbs per foot x (100 ft)² / 8 ÷ 30ft = 4,583.33
ARE 4.0 exam prep: SS

Comments

Post a Comment

Try These Too!

Elevator bank layouts

An office building has an elevator bank with 4 elevators where 2 cabs side-by-side are arranged opposite the other 2. Each of the elevators is 3500-pound capacity with an interior cab dimension of 6'8" x 5'4". What is the recommended corridor width at this group? A. 8 feet B. 9 feet C. 11 feet D. 12 feet Answer C. 11 feet. At 1.5-2 times the car depth (5'4), this could be a range, but 10 feet is a minimum for groups of 4 or more. Therefore C is the best choice. ARE 4.0 exam prep: BDCS
1 comment
See the answer »

Efficient columns

The radius of gyration in the Y-Y axis would be equal to that in the X-X axis in an ideally efficient column. Which of the following sections are most appropriate for both heavy loads and for which many beam connections will be necessary? A. pipe column B. square tube column C. wide-flange column D. C-shape channel E. WT shapes Answer C. wide-flange column. Pipe & square tube columns are more ideal shapes, but are appropriate for light to moderate loads. The radius of gyration of wide-flange shapes can be nearly or close to equal. ARE 4.0 exam prep: SS
Post a Comment
See the answer »

Thermal insulation

Which of the following types of thermal insulation can be blown into wall or ceiling cavities with least difficulty, but contains no adhesive properties? I. Cellulose II. Rock wool III. Vermiculite IV. Mineral wool V. Straw VI. Polyicynene Answer I, II and III are loose-fill types of insulation that can be blown. IV comes in batts, V can come in boards or bales, VI is a spray-foam that adheres to the cavity. ARE 4.0 exam prep: BS
Post a Comment
See the answer »