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ARCH 313 Fall - 2005 Midterm 1 and 2

ARCH 313 Fall - 2005 Midterm 1 and 2 - University of...

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Unformatted text preview: University of Southern California ARCH 3 i 3 School of Architecture Dr. Jeff Guh Midterm Exam: Sep. 22, 2005 Name: -_ "-mLL provided. make up your own assumptions and state 50. Do not ask questions during the exam.) PART I: MULTIPLE-CHOICE PROBLEMS (36 POINTS) % O 1. Two simple beams. one made of wood and the other eel, have the same rectangutar section, span, and uniform loading. Which of the following statements isAtrue? A. Both beams have the same maximum shear stress. wk (All information you need is provided in the probtem statements. lfyou think you need more information sf" B. Both beams have the same bending stress. @ Both beams have the same mid—span deflection. D. None of the above. 2. What is the static determinacy of this beam? Jr ‘ t Q— AW—ng @? The beam is statically determinate. B. The beam is statically indeterminate to the ‘15‘ degree. C. The beam is statically indeterminate to the 2”d degree. D. None of the above. C 3. If a magnitude 7 earthquake occurs near a building properly designed in accordance with the current seismic code. how do you think the building structure will perform? A. It'll collapse. B. It‘ll suffer significant architectural damage, but the structure will be free of damage. a It’ll suffer significant structural damage, but won’t collapse. D. No architectural or structural damage shouid occur. ? 4- What is the maximum shear stress of this wide flange ste Page 1 University of Southern California ARCH 313 School of Architecture Dr. Jeff Guh U 5. In the steel stress-strain diagram. what causes the stress to peak beyond its yielding stress? ’ 1? . A. Brittle cracking. B. Strain hardening. C. Buckling. (E? P-A effect. A 6. Columns A and B are identical except for the way their ends are supported laterally lf column A can support a vertical load (P) of 100 kip before buckling how much vertical load (P) # can column B support? X Li’ 17? ® 100 kip. B. 75 kip. l c. 50 kip. o. 25 kip. k B wwww“ E: C/ 7. Which of the following diagram represents the shear stress distribution in a wide flange steel beam section? i A. B. @D o. 5 3, Which of the following diagram represents the bending stress distribution in a wide flange ». ; steel beam section? a: e 9..-...*_ __\ C 9. When do we use the Euler formula (”ZEULZ)? A. When we calculate vertical deformation of a column under axial load. B. When we calculate the yield load of a column. @When we calculate the buckling load of a column. D. None of the above. Page 2 University of Southern California ARCH 3 i 3 School of Architecture Dr. Jeff Guh V 10. For a simply supported beam, which of the following can reduce its mid-span deflection? A. Increase the width of the beam. B. Increase the depth of the beam. C. Switch to a structural material with higher elastic modulus. ([3) All of the above. C 11. For structural design purpose. what is the span of this beam supported? A. 20 feet. B. 19 feet. @ 18 feet. D. None of the above. fig 12. During the construction phase. the genera: contraCIor usually submit his questions about your design by which means? @ RFI. B. CD. C. Proposal. D. All of the above. Page 3 University of Southern California ARCH 313 School of Architecture Dr. Jeff Guh PART II: WRlTTEN PROBLEMS (64 POINTS) 1. Given a steel beam loaded as shown. The uniform ioading includes ali dead and live load acting on the beam. The beam section is a 10" wide by 20" deep rectangle. The steel is A36 steel (yield stress is 36 ksl and 329.000 ksi). What is the maximum shear stress and where does it occur? What is the maximum bending stress and where does it occur? What is the maximum deflection at midspan? Is the design conservative? (24 points) 0 IO" BIOL‘L 5mg o; '39 LS}. #4,“:— I ORA l 20.. E = 11.66320 3 73%; 5 1,; lffi; Matt svger - g l 4 ,3 '. ' yoke/Vt. . . ? M“ oJL fu- Vial to . —____ ls(%) “if?“ Wain; l 8 : - E 905 Milan = 2000 $Mr Eat-LL QrWHL/Z x=o v4: 200(°)- l0(01')/z—‘-'I v= WOW/Z = 100 “’5 mu: m: tooth? “WW/1 :3; A- M x 90’ \l;0+ zooms u: zoolbs X: 25 M5 100(90)"°(7°):/’:L C ‘ I : X: 30 m: 20030)“°C?°5 [2‘51" v;100 lbs i In a typical 1-story box system building structure, what are the structural functions of the roof. (10 points) (BTW Fund-10f) a1; ‘Hflfi. (OO‘€ \5' +0 MHSME'\' M g +0 m UM'HLOJ otfavhmfim, WWW“ “ii-NHL We" “0M3 “r M firm-Me, O‘F Jrh-L but‘Ld-cng - ® fizflfi; 327“);de ftp/\cz L; My». fins: [,5ka M/xxaf; {EMT—BUN? 95:, A41 AW 9.? .. 5 i .5 ———— r 3 ’ 9L . Esteem“ . "L!“ g _ , lit at NM 3 1 $1M“ -.-. 1.6249" 6* Z “f ”000 3333527— Page4 b A337 FA if fag C-Qafle, 1’2: 6%. ’r’ Lleflm c.1711 y'ngcL University of Southern California ARCH 313 School of Architecture Dr. jeff Guh A shear wall supported by a rigid footing is modeled as shown. The total vertical weight acting on the wall-footing assembly (W) is 100 kip. The lateral force acting at the top of the wall (F) is 600 kip. What are the vertical reactions at A and B under the combined loading of W and F? Does this design avoid uplifting problems? (15 points) / —-—-;.—-— flazflg: ii—csezc Amen 'ch : Kama-p eta) R75:- {wicz—F’w Kg/oC-{th (i L) Rd: {99 ””9 L ”M“??? ~> 56/743161 lQB-;.-é‘o+/2.s =/7o(< (c) F' , [2" L IN +a 63 K1: x2- 5‘50 (\X‘M ’1‘ T h 1‘ 2": R‘Jl'E-L ®A° F.h= Viv/Z , K— \‘F '1 “ t a at. 900(267 —' '12. 000) ’31 "w ‘ 4. What is the maximum load bearing capacity of this steel column (A36 steel with 36 kst yield stress and 5:29.000 ksi). (15 points) Q a: F“ A Q,— - ’i’ {7: ya ts“ K. —" I" 2 (6%.) riff") -),/’::r\'¥3“ p : vfooin" KL =/.2 x 10’ ‘f-rjj:}y--_M__l.v W LLp’IZ l 5 :9; (Dz 400 «22 “(It s 8800 K may) Mug ‘5‘”6 Ema (£3: GHQ/4‘36fl‘loxtbz ALLFQQK PM: K31 , ”Li/”WK \4 I — iffy—- 5/349 71% Q Page5 L , Lg/«cl Qtfmw; flit WW) 7 Zeta-mo" > r47 University of Southern California ARCH 313 School of Architecture Dr. Jeff Guh Midterm Exam#2: Nov.10, 2005 Name: -- .7 . 58 (Ali information you need is provided in the problem statements. If you think you need more information than provided, make up your own assumptions and state so. TA will not answer guestions during the exam.) PART I: MULTIPLE-CHOICE PROBLEMS (30 POINTS) ’74 6 1. What is the function ofthe lead core in the Lead Core Rubber Isolator? A. To support the gravity toad from the column. B. To provide lateral load resistance against wind. C. To prevent the isolator from yielding during a strong earthquake. D. To simplify the fabrication of the isolator in the shop. During the arc welding, why is it necessary to shield the arc? . To prevent oxygen from entering the weld. 2 A B. To prevent the are from hurting the welder's vision. C. To reduce the power consumption by confining the are. D . None of the above. C 3. Why is calcium chloride often added to concrete mixture? To keep concrete in a plastic state and improve workability. To reduce the amount of water required in the mixture. To accelerate the concrete initial set. .0033? None of the above. C 4. In a wood box system. what is the primary function of hold-downs in the plywood shear walls? A. ,To prevent the edge nails in the plywood diaphragm from popping during earthquake. B. To align the shear wall’s boundary element with the edge of the shear walls in upper floors. C. To transfer the uplifting force from over-turning moment to the foundation. D. None of the above. A 5. in wide flange steel beams, why are web stiffeners often placed under a concentrated load? To prevent web buckling. To reduce the bending stress in the beam. To reduce the shear stress in the web. 0090? . None of the above. Page 1 University of Southern California ARCH 313 School of Architecture Dr. Jeff Guh B B 6. Which of the following welding symbols is correct? A. e. 0. ® “it? [are P) Q 7. To calculate the wind load on Watt Hall, what will be the proper wind exposure category? A. Exposure A. ‘5 WIN €46 t“ 8. Exposure B. C. Exposure 0. D . Exposure D. E7 8. Which of the following aggregate size distribution curves represents desirable aggregate mix? A. C. D. Dylan? VIE ciao? 16“”‘0{3H£ T553“ at,“ 9'9 vii-L1: ”r _. W_--j .T _________ Tmfl _ l J . ' . . “I 5:: (as) 'n of SEC (é) m" Size (é) t‘ .54“ 3113(9) I “ A 9. Why smaller diameter electrode is preferred over larger ones? A. The smaller diameter electrodes produce better quality weld. B. It takes less time to finish the welding lob with smaller diameter electrodes. C. The smaller diameter electrodes can reduce the amount of shielding gas during welding. D. None of the above. A Q 10. What does the designation “compact section” mean for wide flange steel beams? A. The steel section will not buckle before reaching the yield stress. B. The steel section is smallest and lightest among all feasible sections for the beam. C. No web stiffener is required at mid-span of the beam to avoid lateral buckling. D. All of the above. Page 2 University of Southern California ARCH 313 School of Architecture ' Dr. Jeff Guh PART II: WRITTEN PROBLEMS (70 POINTS) 1. Sketch the deformed shape of the following moment frames. Make sure yoursketches are clear enough for the graders to understand. Pay attention to the angles at the joints and how the members curve. (20 points) tr; 2. What potential problems this concentric Chevron braced frame may encounter during a strong earthquake (Hint: the earthquake is strong enough to cause brace buckling; show sketches of the frame at critical stages). How would an eccentrically braced configuration improve the situation? (15 points) Walnuts haunt; MW ‘30 w beGLW‘ will M- @H‘l Page 3 University of Southern California ARCH 313 School of Architecture Dr. Jeff Guh 3. The1985 Mexico City Earthquake has a response spectrum as shown. During that earthquake. taller buildings performed a lot worse than low-rise buildings. Let’s compare the seismic acceleration of two buildings - a 3‘story building and a 20-st0ty building. Please do the following: (a) estimate the fundamental period of vibration of these two buildings, (b) find the seismic acceleration of the buildings during the earthquake, (c) which building has the higher seismic acceleration. and (d) how do you think the soft soil in Mexico City may have affected the response spectrum (20 points) b Ezw‘Kufl at /'O ) F:7_O;é—L~Q—T-EP-%§D\ T-‘C—rt’tfi _ €273 KW 9 M4 grit—9, at 9‘3 Okla-— so 10"“ 1 7’ ’9 sec 6 The. Wfi‘fi_\bmidifl has at “in. 909— 90;) w reg M91 4. Describe how seismic force is transmitted among the horizontal and vertical diaphragms in this typical detail for a wood shear wall system. (indicate where nails should be installed.) (15 points) {Err/e, l6 MWCJCCWCR Farce, [.5 hnsmfilted down ‘H/u. SW? WCA“ , which is HAW} fi1w¢ad Wt WW {amt (mu, 0F We Gtoor, W cmb'nvfsctoww to W émdhxt‘iom, Page 4 ...
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