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Floor Framing - Elements of Architectural Structures - Assignment, Exercises of Structural Design and Architecture

AMET UniversityStructural Design and Architecture

Its assignment for Elements of Architectural Structures. Some points of assignment are: Floor Framing, Columns, Loading, Column Bases, Major Moment Resistance, Member Restraint Menu, Load Factors, Load Combinations, Neglecting, Bending Stress

Typology: Exercises

2011/2012

Uploaded on 12/22/2012

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Assignment #6
Problems: all but 6A, B & C from Ambrose & Tripeny, Chapter 5, pgs 207, 208, 213.
Note: Problems marked with a * have been altered with respect to the problem stated in the text.
6A) The floor framing plan is subject to uniform distributed loads of: dead load = 45 psf, live
load = 120 psf. Determine the resulting reactions by the beams & load on the columns. (load
tracing)
Partial answer to check with: RB2 = 16706.25 lb, RG3@G1 = 10395 lb,
RG1@C1 =12529.7 lb, PonC2 =20,822.8 lb.
6B) Verify the reactions on the columns of problem 7D by constructing a 3D model in
Multiframe4D (View 3D) and loading G1, B2 and G2 only. Use the standard steel section you
have been assigned. Submit the file on Vista and provide a print of the bending moment and
axial force diagrams. Be careful to make joints on all the girders at the location of beam
supports. Model the column bases as fixed. Do not use panels, but put on linearly distributed
loads. Model the beam ends only as a pin-type supports using the member restraint menu and
release (check) the major moment resistance, Mz’, for each end.
6C) The compressive force in a column to each service (unfactored) load are: D = 465 kN,
L = 290 kN, Lr = 65 kN, W = 110 kN, E = 245 kN. Determine the design load for the column
based on LRFD using ASCE-7 load combinations (pg 164). (load factors)
Partial answer to check with:
max{651, 1054.5, max{952, 750}, 1056.5, 1093, max{663.5, 594.5}} kN.
Problem 5.4.B. USE US UNITS. A simple beam of Douglas fir-larch, select structural grade,
has a span of 18 ft [5.49 m] with two concentrated loads of 4 kips [13.34 kN] each placed at
the third points of the span. Neglecting its own weight, determine the size of the beam with the
least cross-sectional area based on bending stress. (bending stress and design)
Partial answers to check with: Sreq’d
192 in3(or 180 in3 if < 4” wide)
MORE NEXT PAGE
(20%)
(5%)
(12%)
(15%)
C2
G4
dead load = 45 psf
live load = 120 psf
B1
C1
C3
C4
18 ft
C1
C4
C3
14 ft
8.5 ft
opening
6 ft
B1
G3
G1
B2
G2
G4
12 ft
G2
G3
B2
G1
decking
decking
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pf2

Partial preview of the text

Download Floor Framing - Elements of Architectural Structures - Assignment and more Exercises Structural Design and Architecture in PDF only on Docsity!

Assignment

Problems: all but 6A, B & C from Ambrose & Tripeny, Chapter 5, pgs 207, 208, 213. Note: Problems marked with a * have been altered with respect to the problem stated in the text.

6A) The floor framing plan is subject to uniform distributed loads of: dead load = 45 psf, live load = 120 psf. Determine the resulting reactions by the beams & load on the columns. (load tracing) Partial answer to check with: RB2 = 16706.25 lb, RG3@G1 = 10395 lb, RG1@C1 =12529.7 lb, PonC2 =20,822.8 lb.

6B) Verify the reactions on the columns of problem 7D by constructing a 3D model in Multiframe4D (View 3D) and loading G1, B2 and G2 only. Use the standard steel section you have been assigned. Submit the file on Vista and provide a print of the bending moment and axial force diagrams. Be careful to make joints on all the girders at the location of beam supports. Model the column bases as fixed. Do not use panels, but put on linearly distributed loads. Model the beam ends only as a pin-type supports using the member restraint menu and release (check) the major moment resistance, Mz’, for each end.

6C) The compressive force in a column to each service (unfactored) load are: D = 465 kN, L = 290 kN, Lr = 65 kN, W = 110 kN, E = 245 kN. Determine the design load for the column based on LRFD using ASCE-7 load combinations (pg 164). (load factors) Partial answer to check with: max{651, 1054.5, max{952, 750}, 1056.5, 1093, max{663.5, 594.5}} kN.

Problem 5.4.B. USE US UNITS. A simple beam of Douglas fir-larch, select structural grade, has a span of 18 ft [5.49 m] with two concentrated loads of 4 kips [13.34 kN] each placed at the third points of the span. Neglecting its own weight, determine the size of the beam with the least cross-sectional area based on bending stress. (bending stress and design)

Partial answers to check with: S req’d  192 in^3 (or 180 in^3 if < 4” wide)

MORE NEXT PAGE

C

G

dead load = 45 psf live load = 120 psf B

C

C4 C

C

18 ft

C

C4 (^) C

14 ft

8.5 ft

opening

6 ft

B

G

G

B

G

G

G2 12 ft

G3 B

G

decking

deck

ing

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Problem 5.5.B. USE US UNITS. A 10 x 14 beam of dense select structural grade is loaded symmetrically with three concentrated loads of 4300 lb [19.13 kN], each placed at the quarter points of the span. Is the beam safe for shear? (shear stress) Partial answers to check with: fv = 75.4 psi < picked allowable (be careful picking because it is not a 2x!)

_Problem 5.7.B_*. USE US UNITS. For this problem, include the beam weight and consider deflection to be limited to L/240 of the beam span. Wood is Douglas fir-larch with density of 32 lb/ft^3. An 8 x 12 beam of dense No. 1 grade is 12 ft [3.66 m] in length and has a concentrated load of 5 kips [22.2 kN] at the center of the span. Investigate the deflection using superpositioning. (beam diagrams and formulas)

Partial answers to check with: midspan = 0.192 in+ 0.006 in < 0.6, in OK

(Be careful to only convert enough feetsome power^ to inchessome power!)

Problem 5.7.D .* USE METRIC UNITS (1 in^4 = 416 x 10-9^ m^4 ) For this problem, neglect the beam weight and consider deflection to be limited to L/240 of the beam span. Wood is Douglas fir-larch. An 8 x 14 beam of select structural grade has a span of 16 ft [4.88 m] and a total uniformly distributed load of 8 kips [35.6 kN]. Investigate the deflection. (E = 11,721,500 kPa) (beam diagrams and formulas and design)

Partial answers to check with: midspan = 7.2 mm < 20.3 mm, OK

Problem 5.9.C. Using Douglas fir-larch, No. 2 grade, pick the joist size required from Table 5.10 for the stated conditions. Live load is 40 psf; dead load is 10 psf; deflection is limited to L/360 of the span under live load only. (beam diagrams and formulas and design)

Joist Spacing (in.)

Joist Span (ft)

16 16

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