3504 - Midterm Quizlet

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School

Louisiana State University *

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Course

3504

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

pdf

Pages

3

Uploaded by LieutenantMetal7366

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CM 3504 Midterm Study online at https://quizlet.com/_c6z8c2 1. A residential floor system (LL=50 psf, DL=10psf) is to be installed with 16' long No. 1 Southern Pine joists. Which choice of joists will NOT work for this floor? 2X10@16" 2. What is the minimum Design Live Load for public rooms in a Hotel? 100psf 3. A structural joint is formed between 2X8 and 6X8 Douglas Fir-Larch wood members connected by 5 20d common wire nails. What is the lateral load capacity of the connection? 850 lbs 4. Timber joists spanning 19' are to be used to support an upper story floor, as shown. The total (live+dead) distributed load on the floor is 67 psf. What design load should be applied to the circled joist to evaluate the design considerations? w= 201 lb/ft W= 7638 lb 5. 2X8 No. 1 Fb= 1200 lb/in^2 6. 2X10 No. 1 Repetitive members Ft= 854 lb/in^2 7. 4X12 No. 1 Fb= 1100 lb/in^2 8. 10x16 dense No. 1 Fv= 170 lb/in^2 9. Determine the allowable bending stress (Fb) and al- lowable Compression parallel to the grain (Fc) for a Douglas Fir-Larch 2X10 No. 1 and better, used in repetitive framing with snow loading. Fb= 1746 lb/in^2 Fc= 1782 lb/in^2 10. Select the best choices of dimensional lumber floor joists for the following spans. Make choice for all applicable grades, No. 1 through No. 3 using Southern Pine Span Tables. No. 1 = 2X8 No. 2 = 2X10 No. 3 = 2X12 11. Select the smallest adequate column sections of Dou- glas Fir-Larch No. 1 for the following data: Axial Load: 118 Unbraced Length: 10 10X12 1 / 3
CM 3504 Midterm Study online at https://quizlet.com/_c6z8c2 12. Select the smallest adequate column sections of Dou- glas Fir-Larch No. 1 for the following data: Axial Load: 123 Unbraced Length: 12 14X14 13. Select the smallest adequate column sections of Dou- glas Fir-Larch No. 1 for the following data: Axial Load: 150 Unbraced Length: 20 None 14. Select the smallest adequate column sections of Dou- glas Fir-Larch No. 1 for the following data: Axial Load: 168 Unbraced Length: 14 14X14 15. Select the smallest adequate column sections of Dou- glas Fir-Larch No. 1 for the following data: Axial Load: 98 Unbraced Length: 10 12X12 16. A simple beam is to be selected of Douglas fir-larch, No. 2. The beam has a span of 14ft with a uniformly distributed load of 1400 lbs/ft. Determine the size of the beam with the least cross-sectional area based on bending stress. M= 34.3k-ft Initial Sreq= 470in^3 Final Selection= 6X24 17. A simply supported 14ft long 4X12 Douglas fir-larch No. 1 joist with a uniformly distributed load of 250 lb/ft is supported by the top plate of a 2X8 wall. What is the bearing stress at the support? 110 lb/in^2 18. Find the actual deflection of a 15ft long 10X16 wood beam with E=1,700,000 psi and Fb= 1600 psi, carrying a total uniformly distributed load of 20 kips. Find the maximum deflection for this beam under its maximum loading. Actual Defl.= 0.30in Max. Defl.= 0.5in 19. 50 ksi steel, by Calculation: Select the lightest W sec- tion for a beam 16ft in length with a superimposed total uniformly distributed live load of 98 kips and a total uniformly distributed dead load of 50 kips. Lightest W= W24X55 Lightest W, (d of 12 inches or less)= W12X79 20. 2 / 3
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