eighteen steel construction: column design ELEMENTS OF ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS SPRING 2019 lecture
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1 ELEMENTS OF ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS SPRING 2019 letue eighteen steel onstution: olumn design Co-Ten Steel Sulptue By Rihad Sea Museum of Moden At Fot Woth, TX (AISC - Steel Stutues of the Eveyday) Steel Columns 1
2 Stutual Steel standad olled shapes (W, C, L, T) tubing pipe built-up Steel Columns 2
3 Design Methods (evisited) know loads o lengths selet setion o load adequate fo stength and no bukling Steel Columns 3
4 Allowable Stess Design (ASD) AICS 9 th ed F slendeness atio a fo kl/ C f itial F. S. Kl E Kl 2 = with F y = 36 ksi = with F y = 50 ksi Steel Columns 4
5 C and Eule s Fomula Kl/ < C shot and stubby paaboli tansition Kl/ > C Eule s elationship < 200 pefeed C 2 2 E F y Steel Columns 5
6 C and Eule s Fomula Steel Columns 6
7 Shot / Intemediate L e / < C whee F a F. S. 5 3 Kl 1 2C F y F. S. Kl Kl 8C 8C 3 3 Steel Columns 7
8 Unified Design limit states fo failue P n F A g P a P u P n P n 1. yielding 2. bukling KL KL E o Fe Fy E o Fe F F e elasti bukling stess (Eule) y 0. 44F 0. 44F y y Steel Columns 8
9 Unified Design P n = F A g fo fo whee KL KL Fy E Fe F Fy E F F F F e y 2 E KL 2 e F y Steel Columns 9
10 Poedue fo Analysis 1. alulate KL/ biggest of KL/ with espet to x axes and y axis 2. find F (see Note) fom appopiate equation tables ae available 3. ompute P n = F A g 4. is P a P n /? o is P u P n? yes: ok Note: text uses F and old = 0.85 no: insuffiient apaity and no good Steel Columns 10
11 Poedue fo Design 1. guess a size (pik a setion) 2. alulate KL/ biggest of KL/ with espet to x axes and y axis 3. find F a o F (see Note) fom appopiate equations o find a hat 4. ompute P n = F A g Note: text uses F and old = 0.85 Steel Columns 11
12 Poedue fo Design (ont d) 5. is P a P n /? o is P u P n? yes: ok no: pik a bigge setion and go bak to step hek design effiieny peentage of stess = if between %: good P 100% P if < 90%: pik a smalle setion and go bak to step 2. Steel Columns 12
13 Column Chats, F Steel Columns 13
14 Column Chats Steel Columns 14
15 Beam-Column Design moment magnifiation (P-) M m 1 fatoed B1 u B M u max C m modifiation fato fo end onditions = (M 1 /M 2 o 0.85 estained, 1.00 unestained P e1 Eule bukling stength P e (LRFD), 1.60(ASD) Kl 2 C 1 ( P / P ) 2 EA e1 Steel Columns 15
16 Beam-Column Design LRFD (Unified) Steel fo P Pu : P P 9 n M bm ux nx M M b ux nx 1. 0 fo P P 0. 2 : Pu 2 P P is equied, P is apaity n M bm M M esistane fato fo ompession = 0.9 esistane fato fo bending = 0.9 ux nx b ux nx 1. 0 Steel Columns 16
17 Design Steps Knowing Loads (evisited) 1. assume limiting stess bukling, axial stess, ombined stess 2. solve fo, A o S 3. pik tial setion 4. analyze stesses 5. setion ok? 6. stop when setion is ok Steel Columns 17
18 Rigid Fame Design (evisited) olumns in fames ends an be flexible stiffness affeted by beams and olumn = EI/L G fo the joint EI EI l is the olumn length of eah olumn l b is the beam length of eah beam measued ente to ente l l b Steel Columns 18
19 Rigid Fame Design (evisited) olumn effetive length, k A B Steel Columns 19
seventeen steel construction: columns & tension members ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS SUMMER 2014 lecture
ARCHITECTURAL STRUCTURES: ORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS Co-Ten Steel Sculptue By Richad Sea Museum of Moden At ot Woth, TX (AISC - Steel Stuctues of the Eveyday) SUMMER 2014 lectue seventeen
twenty steel construction: columns & tension members ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS FALL 2018 lecture
ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS Cor-Ten Steel Sulpture By Rihard Serra Museum of Modern Art Fort Worth, TX (AISC - Steel Strutures of the Everyday) FALL 2018 leture
twenty steel construction: columns & tension members ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS FALL 2013 lecture
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thirteen wood construction: column design ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS SUMMER 2017 lecture
ARCHITECTURAL STRUCTURES: FORM, BEHAVIOR, AND DESIGN DR. ANNE NICHOLS SUMMER 2017 leture thirteen wood onstrution: olumn design Wood Columns 1 Compression Members (revisited) designed for strength & stresses
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