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ARCH 411 Spring 2005 Guh Midterm 1 and 2 with solutions

# ARCH 411 Spring 2005 Guh Midterm 1 and 2 with solutions -...

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Unformatted text preview: University of Southern California 6 O ARCH 4i 1 School of Architecture Dr. Jeff Guh Midterm Exam: Mar. 10, 2005 NameL PART I: MULTIPLE-CHOICE PROBLEMS (40 POINTS) C 1. How do UBC and IBC treat mixed occupancies in a building with respect to the allowable ﬂoor area? . The most restrict occupancy governs. A B. The principal occupancy of the building governs. Faust» FM ‘ , C D . Separate consideration of each occupancy. . None of the above. P) 2. Which of the following statements is true about the beneﬁt of installing automatic sprinkler systems in buildings? A. The basic allowable floor area of a 2-story building may be tripled. $30!.fo {QMOA B. The basic allowable floor area of a 1-story building may be doubled. @ The story limits of the buildings may be increased by one story. @ D. None of the above. 6 3. When raised ﬂoor is used in a Type V wood construction project, what is the required minimum clearance between floor joists and top of soil in the crawl space? ‘12". 16”. 18' - DCQLW V. .. 24" 2 E: 4. Which of the following groups of Types of Construction is treated by UBC as equal in ﬁre nsk? 1, iV-H.T. & Ill-1 TMIJ‘" @ G—W—u-Jm- (Q All the above. A 5_ When a quick sand condition occurs at a site, which of the statements about soil internal stress is true? Total Stress = Water Pressure. 11:66“ A4 5/!“ <8 3:0 (”/th d4 W A. B. Effective Stress > Water Pressure. C. D. Total Stress > Water Pressure To)“ \§‘K\A 43 ”if-(€64?! {£455 .t L fry..- W“ LN. it H a 0+ Page1 “($5 MP I HQ) All the above. University of Southern California ARCH 41 1 School of Architecture Dr. Jeff Guh E 2 6. What is the beneﬁt of the bulb at the tip of a Franki pile? /K To reduce the bearing area between the pile and soii- ® To compress the soil during construction for better compaction. [of To reduce the friction between the pile and the soil. t- D. None of the above. E: 7. According to UBC, what is the height (H) of this building? D‘HLHLAN ® 34 ft [‘K'lO 5 5’ ' ,3 8. In a tri—axial test, what is the purpose of applying pressure to the water in the chamber containing the soil sample? X To speed up the testing process by applying more shear stress on the soil sample B. To simulate the lateral pressure condition of the soil sample in the ﬁeld- C. To protect the membrane containing the soil sample so the sample won't crumble before testing starts. D. None of the above. D Which of the following statements about soil settlement is NOT true? Consolidation of sandy soil may take a long time to complete. 9. A B. Uniform settlement is more tolerable than differential settlement. C. Liquefaction can never happen in clay soil. D. All the above statements are true. E 10. Which of the following deformed cable shapes is correct? A. - 1 B. c. D. 1F q: l; o F l/ M Page 2 University of Southern California ARCH 4i 1 School of Architecture Dr. Jeff Guh PART II: WRITTEN PROBLEMS (60 POINTS) 1- Why do we use the active soil pressure as the loading on a cantilevered retaining wall rather than the actual static soil pressure or passive soil pressure? Isn't it more conservative to use the latter two. since they're higher than active pressure (15 points) _ Tm Owl‘DWXA‘E mu LMMWM coil (”“34th hr évk-‘ll/‘W'lmlule Mimi WWW/twin «(amt is Markmi hm ",A‘) ilm‘f, 5"“MHA’1WL1?F iép‘gm Kahlil/thaw— w-FV‘ELW cat,tyt——lL.\/;,lmweh> twill :50 «(my Add/l. [”5" . (I, a4 1“ QMl> tiﬂtffltlleL-{S “Villa . at W‘i’éi‘v‘. ““1 i L}; il (”in ii . \ h L461“ gfql _3 ill ow Mam (gust-“him kiwi-2A. 6 Mix [twl l‘W~ M ,{ (WV fit-Site “MW/ﬁt”? (til/filA—M (/1 vii alLL-vm l/U/Llr ilx) pawl-ti. “it! mail ,jéx/il lll-kﬂhﬁ") (“lele ('4 {Mil aw) ‘} “Vi l/VJl aﬁ “ @141” (r; (till/t. Why/1i. '\ .{ (all; {:13er 4 2. What is punching shear in a spread footing? What is bending shear? How are the two shear forces resisted by the footing? Dravv sketches to illustrate your verbal statements. (15 points) L WW5 WW 3% l« (Mr-wit: lWLtLllew-t may Wu, @Jckbaat alngwliéﬂL' swath gurv Mug/0e that W'mi‘ll WM ’lLLth l'xcﬂh [’th 0V j’iAi {1‘ (ti-4'6 (1k Mix: .hA'ye mhM‘Lq‘ ﬂ/‘(w I; W 5 S‘QA by) “My VJV‘A L“ \ “5 (Wm,- divul *JiLxlDWWiQ {6% \r J 95% w, lat-«r Wt? £1544 MW @k lln al‘lk (will? 5% Gil-w» Ween!" -D QLQ’MW cum-at (a \ZLWW IIIII WM q l «b waist/t M "“ I253. l $‘n4’rb? ,. w a, _ Mg: {’9 M Page 3 0- . VM'Sh-ftHBWHM ['5 (MW @ ARCH 4” University of Southern California Dr. Jeff Guh School of Architecture 3. A cable is draped over two pulleys (A & B). Horizontal forces are applied at the pulleys to support a uniform gravity load of 1 , 000 #lft. The measured geometry of the cable is as shown. What are the horizontal forces atA and B? Are they the same? Are the forces on the pulleys the same. and why? If we increase the horizontal forces at A and B, with the sag increase or decrease (30 points) ' M: \OOOCQO) 2100 ;\N\ ‘5" l ___.._.—-———__’ ”Hi;— q“: was“ ML 3 O (1 O ‘3 ______ la 5—9—3 11 3x0 kff- /" it norm/ll «9M5 M in (WW > ”BA/WM ﬁx {will All? WW,“§ *(‘Aﬂ/Wlh —-~e University of Southern California ARCH 4i 1 School of Architecture ' Dr. Jeff Guh Midterm Exam #2: Apr. 7, 2005 New: PART I: MULTIPLE-CHOICE PROBLEMS (30 POINTS) A 1. How would a three-hinge arch roof respond to signiﬁcant outside temperature drop? A. The crown of the arch will also come down a little. B. The thrust on the base will decrease. C. The verticai reaction on the base will increase. D. None of the above. D 2. Which of the following shaded diagrams most closely represents the bending moment in a two—hinge arch under a concentrated load? Q. 3. Why are the wires in a standard 7-wire strand deformed? A. To reduce the unit weight (lbslft) of the strand. 8. To reduce the amount of voids between the wires. C. To increase the stiffness of strand, D. None of the above. C. a What is the degree of static indeterminacy of the arch shown? A. o. l l c. 2. D. 3. C: 5. Compared with a reinforced concrete beam, what beneﬁcial effect can we achieve by 7 introducing prestress via a parabolic cable? A. To reduce beam and reactions acting on the supports. B. To increase the dead weight of the beam for better stability against wind uplift. '65. To reduce or eliminate concrete cracking under service load. 6 None of the above. Page 1 University of Southern California ARCH 4i 1 School of Architecture Dr. Jeff Guh _D_ 6. What is the structural function of the grade beam in Kenzo Tange’s Tokyo Olympic Gymnasium? A. To reduce the weight of the pylon and decrease soil pressure. @ To resist the overturning action from the cable tension. C. To reduce the bending moment at the base of the pylon. D. All of the above. A}; What happens to a simple beam under uniform loading, when the surrounding ‘ temperature rises signiﬁcantly? / A. The vertical reaction at the support will increase. B. The vertical reaction at the support will decrease. C. The length of the beam will increase. D. The length of the beam will decrease. C 8. A twin—cable roof with a tie beam is supported by a pair of cantilevered columns. What is the effect of wind uplifting on the bending moment at the base of the column? / A. Bending moment at the column base increases. y Bending moment at the column base decrease. C. Bending moment at the column base remains 0. in D. None of the above is true. 77’1” g E g g 9. How can we increase the structural stability against buckiing of a fixed arch structure? A, Reduce the cross section size of the arch. @) Use structural material with higher yielding strength. C. Reduce the thrust on the arch support by introducing a roller at the support. D. None of the above, g 1 . How many points on a parabola do we need to know to fully determine the geometry of the parabola (assuming no other information is available)?$3.090? «bum-4 Page 2 University of Southern California _ ARCH 411 School of Architecture Dr. Jeff Guh _.,_____..—————————————-————-‘—~———‘“ PART II: WRITTEN PROBLEMS (70 POINTS) 740331. A parabolic cable is suspended over a theater, as shown. What is the dimension y? (25 points) , I - k9 LlO’ ;= a ’20 ‘i I I ”L L:- L? k“ ;\A’L;\4 0:43 WT“? ‘ “a . 3L R: q “l " L‘H‘?L\'O , w ”Tap” "’T V\$(_ 7' Little/(3’10, :l 4* a. ’ = L ,A ‘ meOp «mm 913' 02 \be _1_ ”/1! ‘3: \ri‘SL-sgt A A L in, A, (”a :z I: 3 ’ ‘7} “ﬂu ”to dqsﬁ ‘33 :%M4Af g 2;» ‘ N 3-”: '30 , ‘3- L\' \R [4‘ 5M1 2. A 100~ft long beam under the uniform loading of 1,000 #ift (weight of the beam is included) is prestressed with a parabolic tendon, which applies a 1,000 kips of pre-compression. What is the net bending moment at the mid-span? (25 points) a slooo iii/Cl it i; Loom: h 2,9213. W JM‘AA K \S \ i l t l t tdZ$Tf5kt \IEE!!!EEitMi2 =. ‘93? amok " *‘ ”‘1, ) gamigzmcismmt/ , 2%, L4} Eﬁk‘ Set University of Southern California ARCH 4i 1 School of Architecture Dr. Jeff Guh 3. Analyze ihis 3-hinge arch to ﬁnd the reactions at the supports A and B. (20 points) qL/axM/qyuwtg cocaayms‘) (329cm) 0, “(mg/f ”\$1 5) J , 3| )5 1 L) : T) \/ ,1_ 7, __ i._\ “A. 1 Hg 71 HQ “CM; / Page 4 University of Southern California ARCH 41 1 School of Architecture ' Dr. Jeff Gun ___________#_________.____.._._—_——————-—- WW: Apr. 7,-2005 Name: m PART I: MULTIPLE-CHOICE PROBLEMS (30 POINTS) A 1. How would a three-hinge arch roof respond to signiﬁcant outside temperature drop? A. The crown of the arch will also come down a little. B. The thrust on the base will decrease. C. The vertical reaction on the base will increase. D. None of the above. L J 2. Which of the following shaded diagrams most closely represents the bending moment in a two-hinge arch under a concentrated load? E 3. Why are the wires in a standard T-wire strand deformed? A. To reduce the unit weight (them) of the strand. B. To reduce the amount of voids between the wires. C. To increase the stiffness of strand. D. None of the above. 8 4. What is the degree of static indeterminacy of the arch shown? A. 0. B. ’l. C. 2. D. 3. 7”??? L 5. Compared with a reinforced concrete beam, what beneﬁcial effect can we achieve by introducing prestress via a parabolic cable? A. To reduce bearn and reactions acting on the supports. a. To increase the dead weight of the beam for better stability against wind uplift. _ C. To reduce or eliminate concrete cracking under service load. D. None of the above. - Page 1 W University of Southern California ARCH 4i 1 School of Architecture Dr. Jeff Guh Be. What is'the structural function of the grade beam in Kenzo Tange’s Tokyo Olympic Gymnasium? To reduce the weight of the-pylon and decrease soil pressure. To resist the overturning action from the cable tension. To reduce the bending moment at the base of the pylon. All of the above. What happens to a simple beam under uniform ioading, when the surrounding temperature rises signiﬁcantly? The vertical reaction at the support will increase. The vertical reaction at the support will decrease. The length of the beam will increase. The length of the beam will decrease. A twin-cable roof with a tie beam is supported by a pair of cantilevered columns. What is the effect of wind uplifting on the bending moment at the base of the column? Bending moment at the column base increases. Bending moment at the column base decrease. Bending moment at the column base remains 0. None of the above is true. How can we increase the structural stability against buckling of a ﬁxed arch structure? Reduce the cross section size of the arch. Use structural material with higher yielding strength. Reduce the thrust on the arch support by introducing a roller at the support. None of the above. . How many points on a parabola do we need to know to fully determine the geometry of the parabola (assuming no other information is avaiiabte)? nerve Page 2 University of Southern California ARCH 4i 1 School of Architecture ' Dr. Jeff Guh (SOLE/77°“ 0 LART n: WRITTEN PROBLEMS (70 POlNTS) egver a theater, as shown. What is the dimension y? (25 points) 1. A parabolic cable is suspend 4. gee-3 H“ 5.0 K 2. A TOO-ft long beam under the uniform loading of 1.000 #lfl (weight of the beam is included) is ' prestressed with a parabolic tendon. which applies a 1,000 kips of pre—compression. What is the net bending moment at the mid-span? (25 points) WP (BALANCINQ LoAD/uPLlFr) EMMMMMM ox University of Southern California ARCH 41] Dr. Jeff Guh School of Architecture 3. Analyze this 3-hinge arch to ﬁnd the reactions at the supports A and B. (20 points) __.ﬂ> 4—. ”iv,“ i 2M3 2 O a 000 “)(45‘) - VA (100*)90 ...
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