WorksheetsReinforced Concrete Design Assessment 3
Total questions: 17
Worksheet time: 13mins
According to the discussion, what is the minimum stiffness requirement for bracing elements in a story?
Equal to the stiffness of all the columns
At least 12 times the stiffness of all the columns in the direction of evaluation
Half the stiffness of all the columns
At least 4 times the stiffness of all the columns in the direction of evaluation
If the second order effects exceed 5 percent of the first-order end moments, what should be done according to the NSCP 2015?
Ignore the second order effects
Use only the first-order end moments
Calculate and include the second order moments
Reduce the column height
If the stability index Q equals 0.04, what does this indicate about the frame?
The frame is sway.
The frame is non-sway.
The frame is slender.
The frame is stable.
Given the following calculation for the joint at the top of a column: 1.4×10142.1×1014 = 1.5 What does the result 1.5 represent in the context of column design?
The load capacity of the column
The ratio of column stiffness to beam stiffness at the joint
The height of the column
The width of the column base
What is the purpose of using a monograph in the design of columns as shown in the material?
To determine the height of the column
To read the appropriate k value for sway and nonsway frames
To calculate the load capacity of the column
To measure the width of the column base
If the calculated value of l/r is 22.47, what conclusion can be made regarding slenderness?
Slenderness cannot be neglected.
Slenderness can be neglected.
The column is unsafe.
The column is overdesigned.
Which equation is used to estimate the second-order effect for sway frames according to NSCP 2015?
M1 = M1s + δnsM1ns
M1 = M2s + δsM2ns
M2 = M1ns+ δsM2s
M1 = M1ns + δsM1s
Which expression is commonly used in hand calculations for the sway moment magnification factor?
δs = 1 / (1 - Q)
δs = 1 / (1 - 0.75Q)
δs = Q / (1 - Q)
δs = 1 / Q
Given the following values: Pu = 3447 kN, M1 = 221.541 kN·m, M2 = 297.904 kN·m, what is the value of the factor Cm?
1.00
2.10
0.30
0.75
What is the depth of the equivalent stress block if β1 = 0.85 and c = 600 mm?
706 mm
480 mm
510 mm
500 mm
When calculating the force at each layer of bars, Fsi, what adjustment is made if the bar is in compression?
The force is doubled.
The force is ignored.
The force is adjusted to account for the displaced concrete.
The force is divided by two.
In the context of structural analysis, what does the term 'effective length' refer to?
The length used for buckling calculations
The actual length of the member
The length of the member after deformation
The length of the member under load
Factor βdns may be assumed to be 0.6. What is the other common way of calculating this factor?
Divide dead load by live load for a given combination.
Divide transient gravity loads by transient lateral loads for a given combination.
Divide dead load by transient gravity loads for a given combination.
Divide dead load by transient lateral loads for a given combination.
What is the maximum area of longitudinal reinforcement as per NSCP Section 410.6.1.1?
1% Ag
4% Ag
6%Ag
8%Ag
Provided that the diameter of the longitudinal bar db=25 mm, diameter of transverse bar dt=12 mm, and minimum width of the column h=600, what is the maximum spacing of ties per NSCP Section 425.7.2.1?
576 mm
400 mm
600 mm
300 mm
NSCP Section 406.2.5.1 allows an approximation of the radius of gyration r of the column in the direction of the frame. What is it?
0.25h
0.27h
0.30h
0.32h
The second-order moments should not exceed __ of first-order moments.
20%
30%
40%
50%
