1. Structural Systems Design of the Lincoln Fire Department Headquarters Michelle Burback Structural Engineering Capstone and Senior Honors Project

2. Objective Building Site in Lincoln, Nebraska Architectural Floor Plans To design both gravity and lateral load systems in accordance with the local codes of Lincoln, Nebraska

3. Building Layout Truck Bay Living Quarters

4. Gravity Loads Design Loads: Flat roof snow load: 25 psf Floor live load: 100 psf Floor dead load: 45 psf North Framing plan for the living quarters

5. Composite deck: 2VLI19 deck with 4” concrete slab Steel beams: W16x40, W18x40, W21x44 Girders: W14x34, W21x73 Columns: W12x106, W10x33 Firehouse Gravity System

6. Truck Bay Gravity System Steel deck (non- composite): NR22 Open-web joists: 40LH09 Girders: W10x26 Columns: W10x33 http://www.google.com/imgres?q =open+web+steel+joist&rlz=1R2 SKPB_enUS345&biw=1350&bih= 539&tbm=isch&tbnid=fOOtR- eAI9IU9M:&imgrefurl=http://cr4.globalspec.com/thread/37723&d ocid=xOdOkUIKmlhTJM&imgurl =http://cr4.globalspec.com/PostI mages/200905/ImageDeck.jpg_ OpenImageResource_4F228AE9- 0FFE-7816- 8DB492F6EC80ED2E.jpg&w=40 0&h=255&ei=Lvp5UaGvGMHhrA Hl1YGIDQ&zoom=1&iact=hc&vp x=2&vpy=242&dur=270&hovh=1 79&hovw=281&tx=132&ty=142&p age=2&tbnh=152&tbnw=246&sta rt=20&ndsp=19&ved=1t:429,r:20,s:0,i:147 (Delhi)

7. Lateral Loads Firehouse: Masonry shear walls Truck Bay: Masonry shear walls and braced frame Truck Bay Firehouse

8. Truck Bay Lateral System Flexible roof diaphragm Masonry shear walls at north end Braced frame at south end North

9. Firehouse Lateral System Wind pushes on exterior walls Exterior walls transfer load to floor or roof diaphragm Floor/roof act as rigid diaphragms Diaphragms transfer load to masonry shear walls

10. Shear Wall Design 8” CMU walls f’ m = 1500 psi Fully grouted Designed as unreinforced detailed masonry Vertical: 1 No. 4 bar every 10 feet, around openings, movement joints, and corners Horizontal: two longitudinal wires every two CMU courses, and at bottom and top of walls Vertical reinforcement Horizontal reinforcement

11. Summary Gravity and lateral systems were designed to: Withstand the given loads Meet the needs of the architect and mechanical engineers Maximize ease of construction Minimize construction cost

12. Any questions?

13. References: “Steel Frame Construction.” Delhi State University: 2011. Image. http://faculty.delhi.edu/hultendc/A220-Week3-Lecture-Web.html. http://faculty.delhi.edu/hultendc/A220-Week3-Lecture-Web.html “Concrete Masonry Unit (CMU) Construction.” Delhi State University: 2008. Image. http://faculty.delhi.edu/hultendc/A220-Week2-Lecture-Web.html. http://faculty.delhi.edu/hultendc/A220-Week2-Lecture-Web.html