Question

1. For the truss shown below pok IB 100 K E 20 ft F G 60 K 5@20f 1001 1. The truss shown is extemally (circle comect answer) (2 points) a) determinate and unstable b) indeterminate and stable c) determinate and stable d) indeterminate and unstable Reason: (3 point) 2. The truss shown is intemally (circle correct answer) (2 point) a) determinate and unstable b) indeterminate and stable c) determinate and stable d) indeterminate and unstable Reason: 3 point) 3. Place an "Oon members with zero force on the truss above 5 points) 4-Solve for internal force in member (10 points) 5- Solve for internal force in memberi (10 points) 6. Solve for internal force in member BC (10 points)

Answer 1

#solution of PAGE-I Considering the conditions & plenetes & figure from the question 100 bile P / 100 20 क Kit By I G 'RF K * * * * 20 20 + 20 20 20 Her is support keep stricture in static Equilibrio It is externally stable. Conditions to check internal stability No. of Eppoting = 2 No. of joints = 2x11=22 No. of unknowns = supost it no of touss nehers = 3 +16 No. of on No. of equations knowns 19 of unknowns. * Wb ri unstable truss internally

static équilibrin equations. • PAGE 2 {F 20 Katoro Ky=40 ie Ky=hol {fyzo Ky +P = 100+100-60 KytRf the EMK 20 140 x 20)+(220x73) -(60x60)+(ley 80) 120x0) -- RE=72 Ky = 140-72=68 ☺ Truss is externally stable & determinate Truss is interally installe & deliminate 13,4,5,6 Ca compressefore T = Tesile Joint A yo RAB RAK {fro RABT 40 zo PAR=40 PAB= 40 (c)

PAGE-3 Efyco / RAKO Joint ki 68 ARRB Jooks RKS tond - KJ AR two =26 T. 0-45 EF=0 RLB Cases + Rks = 40 fy -o Rizzsin 45 +6850 Riez = -96.16 - 96.1568 45. + Refr40. Ring = 108 (1) * Joint B RBC 45 Ery 0 RBr = 50 -96.16 Sinks Too -96.16 Rec. 2107.88 RBJ PBC = 109.98 (C)

PAGE-Y Efy -0. R257100-96.16 Posts'eo RBS 5-32 1 25 = 32(0) Joint. I - 32 R03 {fy=0 R 31+ legos 45=108 108 Rss {fy=o logginus-32 =0 Reg= 45.25(T) RII=7611) & Joint F RE 72 Ef=0 REF Rof the loses no REF Efy=0 REF sines' +72.00 REF E-101-81 =70)-840) Raf - 72(7) Joint RPE RES slut.82

PAGES {Fy=0 -101.82 sinus =RE - ROES -71-99 799(0) {fy=0 -101.82 cos 45 + REG + 100 Co. REC 3-28 = 27 ) * Joint G- ROG 28 10 ROG COS 45 + RHG = 22 RPGsinus -28=0 Rith us C RPG = 3959 (T) ROF=22 RHG - 44(T) & Joint Dia -7.99 :- 799+39.580345 = Rep Reo - 43.49 = 43.13 (1) 39:59 ROH ROH +32.58 sinus = Rex =-28 = 2300) de Joint He Rin + R CH cosus - 28tto + RCA sinus =a 126H 5-45.25=45.251C) RIH

PAGE 6 RIH= 7811) Joint. I RI نا 7 RIS Rait R I HER I J = 76/7) Ro=0 PLEASE UPUOTE. -) *. *4 voy much necessely fois me