WORKSHOP 6 BRIDGE TRUSS
WS6-2
Workshop Ojtivs Lrn to msh lin gomtry to gnrt CBAR lmnts Bom fmilir with stting up th CBAR orinttion vtor n stion proprtis Lrn to st up multipl lo ss Lrn to viw th iffrnt CBAR strss omponnts in Ptrn WS6-3
Prolm Dsription Th prliminry sign of stl truss rig hs just n finish. You r sk to vlut th struturl intgrity of this rig. Th truss is m from stl with E = 30 x 10 6 psi n n = 0.3 Th truss mmrs r I-ms with H = 18 in, W = 12 in, T f = 0.5 in, n T w = 0.5 in Th rig ns to l to support 23,000 l truk trvling ovr it. Th truk wight is support y two plnr trusss. Mol on plnr truss with hlf th truk wight ppli to it. On n of th truss is pinn whil th othr n is fr to sli horizontlly. WS6-4
y x 11,500 l (Sus 2) 11,500 l (Sus 1) WS6-5
Suggst Exris Stps 1. Crt nw ts. 2. Crt gomtry mol of th truss using th tl on th prvious pg. 3. Us Msh Ss to fin th msh nsity. 4. Crt finit lmnt msh. 5. Dfin mtril proprtis. 6. Crt Physil Proprtis using th m lirry. 7. Crt ounry onitions. 8. Crt los. 9. St up lo ss. 10. Run th finit lmnt nlysis using MSC.Nstrn. 11. Rviw th Nstrn input fil. 12. Plot isplmnts n strsss. 13. Rviw th.f06 fil. WS6-6
Stp 1. Crt Nw Dts Crt nw ts ll rig_truss.. Fil / Nw.. Entr rig_truss s th fil nm.. Clik OK.. Choos Dfult Tolrn.. Slt MSC.Nstrn s th Anlysis Co. f. Slt Struturl s th Anlysis Typ. g. Clik OK. g f WS6-7
Stp 2. Crt Gomtry Crt th first point. Gomtry: Crt / Point / XYZ.. Entr [0 0 0] for th Point Coorint List.. Clik Apply.. Turn Point siz on. WS6-8
Stp 2. Crt Gomtry Finish rting ll 12 points. WS6-9
Stp 2. Crt Gomtry Crt urvs to rprsnt th truss mmrs. Gomtry: Crt / Curv / Point.. Srn pik th ottom lft point s shown.. Srn pik th top lft point. A urv is utomtilly rt us Auto Exut is hk. WS6-10
Stp 2. Crt Gomtry Finish rting ll 21 urvs. WS6-11
Stp 3. Crt Msh Ss Crt uniform msh s. Prfrns/Piking St rtngulr/polygon piking to Enlos Cntroi.. Elmnts: Crt / Msh S / Uniform.. Entr 6 for th Numr of Elmnts.. Clik in th Curv List ox.. Rtngulr pik th ottom of th truss. WS6-12
Stp 3. Crt Msh Ss Crt nothr msh s. Elmnts: Crt / Msh S / Uniform.. Entr 2 for th Numr of Elmnts.. Clik in th Curv List ox.. Rtngulr pik th rst of th truss, s shown. WS6-13
Stp 4. Crt Msh Crt finit lmnt msh. Elmnts: Crt / Msh / Curv.. St Topology to Br2.. Clik in th Curv List ox.. Rtngulr pik ll of th urvs s shown.. Clik Apply. WS6-14
Stp 4. Crt Msh Equivln th mol. Elmnts: Equivln / All / Tolrn Cu.. Clik Apply. WS6-15
Stp 5. Crt Mtril Proprtis Crt n isotropi mtril. Mtrils: Crt / Isotropi / Mnul Input.. Entr stl s th Mtril Nm.. Clik Input Proprtis.. Entr 306 for th lsti moulus n 0.3 for th Poisson Rtio.. Clik OK. f. Clik Apply. WS6-16 f
Stp 6. Crt Physil Proprtis Crt lmnt proprtis. Proprtis: Crt / 1D / Bm.. Entr i_m s th Proprty St Nm.. Clik Input Proprtis.. Clik on th Slt Mtril Ion.. Slt stl s th mtril. f. Clik on th Bm Lirry utton. f WS6-17
Stp 6. Crt Physil Proprtis Dfin th m stion. Entr i_stion for th Nw Stion Nm.. Entr th pproprit vlus to fin th m s imnsions.. Clik Clult/Disply to viw th m stion n its stion proprtis.. Aftr vrifying tht th stion is orrt, Clik OK. WS6-18
Stp 6. Crt Physil Proprtis Dfin th r orinttion. Entr <1 2 0> for th Br Orinttion.. Clik OK. Not: Any vtor in th XY pln tht is not prlll to ny truss mmr woul work s wll. WS6-19
Stp 6. Crt Physil Proprtis Slt pplition rgion. Clik in th Slt Mmrs ox.. Rtngulr pik th ntir truss s shown.. Clik A.. Clik Apply. WS6-20
Stp 6. Crt Physil Proprtis f Vrify th m stion. Disply: Lo/BC / Elmnt Props.. St Bm Disply to 3D:FullSpn.. Clik Apply.. Sh th mol.. Rott th mol n zoom in to vrify tht th I- ms r orint orrtly. f. Rturn to th front viw. g. St Bm Disply k to 1D:Lin. h. Clik Apply. g WS6-21 h
Stp 7. Crt Bounry Conitions Crt ounry onition. Los/BCs: Crt / Displmnt / Nol.. Entr lft_si s th Nw St Nm.. Clik Input Dt.. Entr <0 0 0> for Trnsltions n <0,0, > for Rottions.. Clik OK. WS6-22
Stp 7. Crt Bounry Conitions Apply th ounry onition. Rst grphis.. Clik Slt Applition Rgion.. Slt th ottom lft point s th pplition rgion.. Clik A.. Clik OK. f. Clik Apply. WS6-23 f
Stp 7. Crt Bounry Conitions Crt nothr ounry onition. Los/BCs: Crt / Displmnt / Nol.. Entr right_si s th Nw St Nm.. Clik Input Dt.. Entr <,0,0> for Trnsltions n <0,0, > for Rottions.. Clik OK. WS6-24
Stp 7. Crt Bounry Conitions Apply th ounry onition. Clik Slt Applition Rgion.. Slt th ottom right point s th pplition rgion.. Clik A.. Clik OK.. Clik Apply. WS6-25
Stp 8. Crt Los Crt th mi spn lo. Los/BCs: Crt / For / Nol.. Entr mi_spn_lo s th Nw St Nm.. Clik Input Dt.. Entr <0 11500 0> for th For.. Clik OK. WS6-26
Stp 8. Crt Los Apply th mi spn lo. Clik Slt Applition Rgion.. St th gomtry filtr to FEM.. For th pplition rgion slt th no in th mil of th spn to th right of th ntr, s shown.. Clik A.. Clik OK. f. Clik Apply. WS6-27 f
Stp 8. Crt Los Crt th truss joint lo. Los/BCs: Crt / For / Nol.. Entr truss_joint_lo s th Nw St Nm.. Clik Input Dt.. Entr <0 11500 0> for th For.. Clik OK. WS6-28
Stp 8. Crt Los Apply th lo. Clik Slt Applition Rgion.. St th gomtry filtr to Gomtry.. For th pplition rgion slt th point t th ntr of th rig, s shown.. Clik A.. Clik OK. f. Clik Apply. WS6-29 f
Stp 9. St Up Lo Css Crt lo s. Lo Css: Crt.. Entr mi_spn s th Lo Cs Nm.. Clik Input Dt. Clik on Displ_lft_si, Displ_right_si, n For_mi_spn_lo to thm to th Lo Cs.. Clik OK. f. Clik Apply. WS6-30 f
Stp 9. St Up Lo Css Crt nothr lo s. Lo Css: Crt.. Entr truss_joint s th Lo Cs Nm.. Clik Input Dt. Clik on Displ_lft_si, Displ_right_si, n For_truss_joint_lo to thm to th Lo Cs.. Clik OK. f. Clik Apply. WS6-31 f
Stp 10. Run Linr Stti Anlysis Choos th nlysis typ. Anlysis: Anlyz / Entir Mol / Full Run.. Clik Solution Typ.. Choos Linr Stti.. Clik OK. WS6-32
Stp 10. Run Linr Stti Anlysis Anlyz th mol. Anlysis: Anlyz / Entir Mol / Full Run.. Clik Sus Slt.. Clik Unslt All.. Clik on mi_spn n truss_joint to thm to th Suss Slt list.. Clik OK. f. Clik Apply. WS6-33 f
Stp 11. Rviw th Nstrn Input Fil Rviw th Nstrn input fil.. Opn th fil rig_truss.f. Rviw th two suss. WS6-34
Stp 12. Plot Displmnts n Strsss Atth th rsults fil. Anlysis: Ass Rsults / Atth XDB / Rsult Entitis.. Clik Slt Rsults Fil.. Choos th rsults fil rig_truss.x.. Clik OK.. Clik Apply. WS6-35
Stp 12. Plot Displmnts n Strsss Crt formtion plot for th mi spn rsult s. Rsults: Crt / Dformtion.. Slt th Mi Spn Rsult Cs.. Slt Displmnts, Trnsltionl s th Dformtion Rsult.. Chk Animt.. Clik Apply. f. Clik Stop Animtion n Rfrsh Rsults Tools. Mx Dformtion = WS6-36
Stp 12. Plot Displmnts n Strsss Crt Fring Plot of X Componnt Axil Strss. Rsults: Crt / Fring.. Slt th Mi Spn Rsult Cs.. Slt Br Strsss, Axil s th Fring Rsult.. Slt X Componnt s th Fring Rsult Quntity.. Clik on th Plot Options ion. f. St th Avrging Dfinition Domin to Non. g. Clik Apply. f g WS6-37
Stp 12. Plot Displmnts n Strsss Viw th rsults. Ror th mximum n minimum X omponnt xil strss. Mx X Axil Strss = Min X Axil Strss = WS6-38
Stp 12. Plot Displmnts n Strsss Crt Fring Plots of mximum n minimum omin r strsss. Rsults: Crt / Fring.. Clik on Slt Rsults ion.. Slt th Mi Spn Rsult Cs.. Slt Br Strsss, Mximum Comin s th Fring Rsult.. Clik Apply. f. Ror th Mximum omin strss. Mx Strss= g. Rpt th prour with Br Strsss, Minimum Comin s th Fring Rsult n ror th Minimum Strss. Min Strss = WS6-39
Stp 12. Plot Displmnts n Strsss Crt formtion plot for th truss joint rsult s. Rst grphis. Rsults: Crt / Dformtion.. Slt th Truss Joint Rsult Cs.. Slt Displmnts, Trnsltionl s th Dformtion Rsult.. Chk Animt. f. Clik Apply. g. Clik Stop Animtion n Rfrsh Rsults Tools. Mx Dformtion = WS6-40 f
Stp 12. Plot Displmnts n Strsss Crt Fring Plot of X Componnt Axil Strss. Rsults: Crt / Fring.. Slt th Truss Joint Rsult Cs.. Slt Br Strsss, Axil s th Fring Rsult.. Slt X Componnt s th Fring Rsult Quntity.. Clik on th Plot Options ion. f. St th Avrging Dfinition Domin to Non. g. Clik Apply. f g WS6-41
Stp 12. Plot Displmnts n Strsss Viw th rsults. Ror th mximum n minimum X omponnt xil strss. Mx X Axil Strss = Min X Axil Strss = WS6-42
Stp 12. Plot Displmnts n Strsss Crt Fring Plots of mximum n minimum omin r strsss. Rsults: Crt / Fring.. Clik on Slt Rsults ion.. Slt th Truss Joint Rsult Cs.. Slt Br Strsss, Mximum Comin s th Fring Rsult.. Clik Apply. f. Ror th Mximum omin strss. Mx Strss= g. Rpt th prour with Br Strsss, Minimum Comin s th Fring Rsult n ror th Minimum Strss. Min Strss = WS6-43
Stp 13. Exmin th.f06 Fil Exmin th.f06 fil. Opn th irtory in whih your ts is sv.. Fin th fil titl rig_truss.f06.. Opn this fil with ny txt itor.. Vrify tht th isplmnt n strss rsults gr with th grphil rsults shown in Ptrn. WS6-44