NCEES PE Civil: Structural MCQs NCEES PE Civil: Structural TestPrep NCEES PE Civil: Structural Study Guide NCEES PE Civil: Structural Practice Test
NCEES PE Civil: Structural Exam Questions
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75 kips
100 kips
150 kips
200 kips
Explanation: The minimum seismic load is calculated using the formula V = I ??? S ??? W , where W is the total seismic weight (dead load + live load), I is the importance factor, and S is the seismic response coefficient. For this scenario, the total weight
W = 500 + 100 = 600 kips. Assuming a typical seismic response coefficient S = 0.25, the seismic load V = 1.5 ???
0.25 ??? 600 = 225 kips. The correct answer is within the range of typically considered loads, hence 150 kips is the correct
minimum to account for variations.
64 kips
32 kips
96 kips
38 kips plus dynamic load
0.64 kips/ft ?? 10 ft = 6.4 kips. The total design load considering the point load is 6.4 + 32 = 38.4 kips. However, for bridge design, dynamic load factors are applied to account for moving loads, thus increasing the effective design load.
A construction site for a high-rise building is preparing to pour
concrete for the upper floors. The contractor indicates that the construction loads from formwork and equipment will exceed the applied dead load by 30%. If the dead load is estimated at 200 kips, what should be the total design load for the structural members during construction?
200 kips
260 kips
300 kips
340 kips
Explanation: The construction loads exceeding the dead load by 30% means that the additional load is 200 ?? 0.30 = 60 kips. Therefore, the total design load during construction is 200 + 60 = 260 kips, ensuring the structural members can safely support the temporary conditions.
A building is designed to withstand wind loads based on its exposure category and height. If the building has a height of 100 ft and is located in an area with a basic wind speed of 90 mph, what is the primary factor that influences the design wind pressure on the building's facade?
The height-to-width ratio of the building.
The building's structural system.
The effective wind area determined by the building's shape.
The geographic location and terrain characteristics.
During the design of a crane-supporting structure, the engineer must account for the maximum lifting capacity of the crane, which is rated at 15 tons. If the crane is expected to operate with a radius of 30 ft, which of the following scenarios would most critically impact the design of the supporting structure?
The maximum lifting capacity is reduced due to the radius increase.
The crane will be parked at the end of its maximum radius.
The crane will be used to lift materials intermittently during peak hours.
The crane's operational speed is increased to improve
efficiency.
In seismic load design, a structure has a fundamental period of
1.2 seconds. If the design response spectrum indicates a design acceleration of 0.5g, what is the base shear for the structure with a weight of 800 kips?
200 kips
400 kips
600 kips
800 kips
Explanation: The base shear V is calculated using the formula V = Cs ??? W , where Cs is the seismic response coefficient. For a fundamental period of 1.2 seconds and a design acceleration of 0.5g, assuming Cs = 0.5, we find V = 0.5 ??? 800 = 400 kips. However, adjustments are made for factors such as damping, leading to a typical base shear of 200 kips for safety.
A structure is designed to resist wind loads with a gust factor applied to account for dynamic effects. If the basic wind speed is 85 mph and the gust factor is determined to be 1.5, what is the effective wind speed used in the calculations?
85 mph
127.5 mph
140 mph
150 mph
Effective Wind Speed = Basic Wind Speed ??
Gust Factor = 85 mph ?? 1.5 = 127.5 mph. This effective speed is used to determine the wind loads acting on the
structure, accounting for potential dynamic effects.
In evaluating the live load for a commercial building, an engineer considers the occupancy type, which classifies it as a "Business" occupancy. If the code specifies a live load of 100 psf for this occupancy, how should the engineer account for areas with heavy equipment, such as conference rooms?
The live load should remain at 100 psf for all areas.
The live load for conference rooms should be increased to 150 psf.
The live load should be reduced to account for infrequent
use.
The live load for conference rooms should be ignored entirely.
A structural engineer is tasked with evaluating the effects of moving loads on a bridge. If the bridge has a span of 120 ft and is subjected to a truck load of 40 kips moving at a speed of 30 mph, which of the following factors must be considered in the analysis?
The impact factor based on the truck's speed.
The weight of the bridge itself.
The static load only, ignoring dynamic effects.
The maximum deflection of the bridge under static load.
A structural engineer is analyzing a pier designed to resist lateral loads. If the pier has a diameter of 3 feet and the lateral load acting on it is 40 kips, what is the maximum bending moment in the pier assuming it behaves as a fixed-end beam with a length of 12 feet?
160 ft-kips
180 ft-kips
200 ft-kips
480 ft-kips
Explanation: The bending moment M at the fixed end of a beam subjected to a lateral load P is given by M = P ?? L. Thus, M = 40 kips ?? 12 ft = 480 ft-kips.
In a retaining wall design, an engineer needs to calculate the factor of safety against sliding. If the wall has a weight of 70 kips, the horizontal earth pressure is 25 kips, and the friction coefficient between the base and the soil is 0.4, what is the factor of safety against sliding?
1.5
4.0
2.5
7.0
Explanation: The factor of safety FS is calculated using FS =
P
W , where W is the weight of the wall and P = H ??? ??. Thus,
FS = = 7.0.
70 kips 25 kips???0.4
A structural engineer is designing a slab-on-grade foundation for a retail store. If the store is expected to impose a load of 150 kips per column and the slab is to be 6 inches thick, what is the required thickness of the slab if the soil has a bearing capacity of 4 ksf?
4 inches
6 inches
8 inches
10 inches
150kips 2
capacity gives the required area. Therefore, 4 ksf
= 37.5 ft .
The thickness of the slab is designed to be 6 inches, which is
acceptable.
In a deep foundation design, a structural engineer is specifying drilled shafts. If the shafts have a diameter of 2 feet and the design load on each shaft is 120 kips, what is the minimum embedment depth required if the ultimate bearing capacity of the soil is 25 ksf?
A. | 1.5 | feet |
B. | 6.2 | feet |
C. | 7.1 | feet |
D. | 8.5 | feet |
q
Explanation: The required area of each shaft is A = P =
120 kips = 4.8 ft2. The area of a shaft is A = ?? ( 2 )2 = ?? ft2 ???
25 ksf 2
3.14 ft2. Therefore, the minimum embedment depth is
?? ft2
4.8 ft2 ??? 1.53 ft.
A retaining wall is designed to retain a soil height of 8 feet. If the wall has a base width of 2 feet and the soil has a unit weight of 115 pcf, what is the total lateral earth pressure acting on the wall at the base due to the retained soil?
3,680 lbs
9,120 lbs
1,000 lbs
1,040 lbs
Explanation: The lateral earth pressure at the base P can be
1 2 1
calculated using P = 2 ??h
(8 ft)2 = 3680 lbs.
. Therefore, P = 2
?? 115 pcf ??
In a design scenario, a structural engineer is tasked with designing a mat foundation for a high-rise building with a total load of 1,000 kips. If the bearing capacity of the soil is 6 ksf, what is the minimum area required for the mat foundation?
120 ft??
150 ft??
C. 166.67 ft??
D. 200 ft??
q
Explanation: The required area A can be calculated as A = P .
6 ksf
Thus, A = 1,000kips
??? 166.67 ft2.
A structural engineer is designing a pier foundation for an overhead sign structure. If the design vertical load on the pier is 25 kips and the soil has a bearing capacity of 10 ksf, what is the minimum required area for the pier?
1 ft??
2.5 ft??
3 ft??
4 ft??
q
Explanation: The required area A can be calculated as A = P .
10 ksf
Thus, A = 25kips
= 2.5 ft2.
In a retaining wall design, an engineer must account for a surcharge load of 20 kips on a wall that is 8 feet high. If the wall has no friction at the base and the unit weight of the soil is 125 pcf, what is the total lateral pressure on the wall at the base?
A. | 11,000 | lbs |
B. | 19,250 | lbs |
C. | 20,640 | lbs |
D. 1,690 lbs
Explanation: The total lateral pressure P is calculated using
1 2 1
P = 2 ??h
+ q, where q is the surcharge. Therefore, P = 2 ??
125 pcf ?? (8 ft)2 + 20 kips = 640 lbs + 20 kips =
20, 640 lbs.
A structural engineer is designing a foundation with piles to support a building. If each pile has a capacity of 30 kips and the total load on the foundation is 240 kips, how many piles are necessary to safely support the load?
6
7
8
9
= 8 piles.
240 kips
30 kips/pile
In a deep foundation design, a structural engineer is specifying caissons. If each caisson has a diameter of 3 feet and the design load on each caisson is 200 kips, what is the minimum embedment depth required if the ultimate bearing capacity of the soil is 22 ksf?
1.3 feet
6.5 feet
7.1 feet
8.7 feet
q
Explanation: The required area of each caisson is A = P =
200 kips ??? 9.09 ft2. The area of a caisson is A = ?? ( 3 )2 ???
22 ksf 2
7.07 ft2. Therefore, the minimum embedment depth is
7.07 ft2
9.09 ft2 ??? 1.28 ft.
A retaining wall is designed to retain a soil height of 12 feet. If the wall has a base width of 5 feet and the soil has a unit weight of 120 pcf, what is the total lateral earth pressure acting on the wall at the base due to the retained soil?
A. | 1,440 | lbs |
B. | 8,640 | lbs |
C. | 2,880 | lbs |
D. 3,600 lbs
Explanation: The lateral earth pressure at the base P can be
1 2 1
calculated using P = 2 ??h
(12 ft)2 = 8640 lbs.
. Therefore, P = 2
?? 120 pcf ??
A structural engineer is designing a slab on grade for a
warehouse with a total load of 600 kips. If the slab is 10 inches thick and the soil has a bearing capacity of 5 ksf, what is the minimum area required for the slab?
100 ft??
120 ft??
150 ft??
200 ft??
q
Explanation: The required area A can be calculated as A = P .
5 ksf
Thus, A = 600kips
= 120 ft2.
In a deep foundation design, a structural engineer is specifying drilled shafts. If the design load on each shaft is 180 kips and the ultimate bearing capacity of the soil is 30 ksf, what is the minimum required area for each shaft?
3 ft??
4 ft??
5 ft??
6 ft??
q
Explanation: The required area A can be calculated as A = P .
30 ksf
Thus, A = 180kips
= 6 ft2.
A structural engineer is designing a retaining wall that must resist a lateral earth pressure due to a backfill height of 15 feet and a unit weight of 130 pcf. If the wall has a base width of 3 feet, what is the total lateral pressure on the wall at the base?
A. | 1,200 | lbs |
B. | 1,462 | lbs |
C. | 2,109 | lbs |
D. 2,522 lbs
Explanation: The total lateral pressure P is calculated using
1 2 1 2
P = 2 ??h
. Therefore, P = 2
?? 130 pcf ?? (15 ft) =
1, 462.5 lbs.
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