RCHITCTURL STRUCTURS: OR, BHVIOR, ND DSIGN DR. NN NICHOLS SUR 016 lete sevetee Co-Te Steel Slpte B Rihad Sea sem of ode t ot Woth, TX (ISC - Steel Sttes of the veda) Sttal Steel stadad olled shapes (W, C, L, T) tbig pipe bilt-p steel osttio: olms & tesio membes Steel Colms & Tesio 1 009ab Steel Colms & Tesio Desig ethods (evisited) kow loads o legths selet setio o load adeqate fo stegth ad o bklig llowable Stess Desig (SD) ICS 9 th ed sledeess atio a fo kl/ C f. S. itial Kl 1 Kl = 16.1 with = 6 ksi = 107.0 with = 50 ksi Steel Colms & Tesio Steel Colms & Tesio 4 1
C ad le s omla C ad le s omla Kl/ < C shot ad stbb paaboli tasitio Kl/ > C le s elatioship < 00 pefeed C Steel Colms & Tesio 5 Steel Colms & Tesio 6 Shot / Itemediate L e / < C whee a. S. 5 Kl C 1. S. Kl Kl 8C 8 C Uified Desig limit states fo faile 0. 90 1. ieldig. bklig KL KL a e elasti bklig stess (le) 4. 71 o e 0. 44 4. 71 o e 0. 44 g Steel Colms & Tesio 7 Steel Colms & Tesio 8 S011ab
Uified Desig = g fo KL 4. 71 fo KL whee 4. 71 e 0. 658 0. 877 KL e oede fo alsis 1. allate KL/ biggest of KL/ with espet to x axes ad axis. fid a o fom appopiate eqatio tables ae available. ompte allowable = a o = g o fid f atal = / 4. is allowable ( a /)? o is? es: ok o: isffiiet apait ad o good Steel Colms & Tesio 9 S011ab Steel Colms & Tesio 10 011ab oede fo Desig 1. gess a size (pik a setio). allate KL/ biggest of KL/ with espet to x axes ad axis. fid a o fom appopiate eqatios o fid a hat 4. ompte allowable = a (o / = ) o = g o fid f atal = / oede fo Desig (ot d) 5. is allowable? o is? es: ok o: pik a bigge setio ad go bak to step. 6. hek desig effiie peetage of stess = if betwee 90-100%: good 100% if < 90%: pik a smalle setio ad go bak to step. Steel Colms & Tesio 11 011ab Steel Colms & Tesio 1 S011ab
Colm Chats, a (pg. 461-46) Colm Chats, Steel Colms & Tesio 11 Steel Colms & Tesio 14 011ab Colm Chats Beam-Colm Desig momet magifiatio (-) m B 1 B1 max fatoed C 1 ( / ) e1 C m modifiatio fato fo ed oditios Steel Colms & Tesio 14 S011ab = 0.6 0.4( 1 / ) o 0.85 estaied, 1.00 esaied e1 le bklig stegth e 1-1.00 (LRD), 1.60(SD) Steel Colms & Tesio 15 Kl S011ab 4
Beam-Colm Desig LRD (Uified) Steel fo 8 0. : 9 b fo x 0. : b is eqied, is apait - esistae fato fo ompessio = 0.9 b - esistae fato fo bedig = 0.9 x x x b b 1. 0 1. 0 Desig Steps Kowig Loads (evisited) 1. assme limitig stess bklig, axial stess, ombied stess. solve fo, o S. pik tial setio 4. aalze stesses 5. setio ok? 6. stop whe setio is ok Steel Colms & Tesio 16 S011ab Steel Colms & Tesio 18 Rigid ame Desig (evisited) olms i fames eds a be flexible stiffess affeted b beams ad olm = I/L I l G I fo the joit b l is the olm legth of eah olm l b is the beam legth of eah beam meased ete to ete l Rigid ame Desig (evisited) olm effetive legth, k B Steel Colms & Tesio 19 Steel Colms & Tesio 0 5
Tesio embes steel membes a have holes eded aea of ieased stess g all holes s t 4g (ISC - Steel Sttes of the veda) ffetive Net ea likel path to ip aoss bolts divide tasfeed foe too shea lag e U Steel Colms & Tesio 19 Steel Colms & Tesio 0 Tesio embes limit states fo faile 1. ieldig. pte* Steel Colms & Tesio a 0. 90 t g - goss aea e - effetive et aea (holes 1/8 + d) t 0. 75 = the tesile stegth of the steel (ltimate) g e t S011ab 6