tables - bending moments shear forces and deflection tables

25
CA NTIL EV&S 'iw c b—4 a L I' L - Wx2 Wa Mmax 7 W cwrved—raight I— Frjp Izçjg ° W(&+/8a2b+/2ab3b3) dmaxfJ(' 24E1 +Ja) _______________________ 2W ___ I/A J/Q a b— c— ____ ____ L. L M N ______ RAW 4.— curved .4strai'ht f_- i aj dnaxjx c/C /5(1 5b umax. ,(/# Bending moment, shear and deflection 1077 Steel Designers Manual (6th Edition) - Bending moment, shear and deflection tables Discuss me ... Created on 02 March 2009 This material is copyright - all rights reserved. Use of this document is subject to the terms and conditions of the Steelbiz Licence Agreement

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Bending moment diagrams

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  • CA NTIL EV&S

    'iwc b4 a

    L I' L -

    Wx2

    WaMmax 7

    W

    cwrvedraight IFrjp Izjg W(&+/8a2b+/2ab3b3)

    dmaxfJ(' 24E1+Ja)_______________________

    2W___

    I/A J/Qa b c

    ____ ____L. L

    M

    N ______RAW

    4. curved .4strai'ht f_-i ajdnaxjx c/C /5(15bumax. ,(/#

    Bending moment, shear and deflection 1077

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  • CA NT/LEVERS

    9 w I 2W

    ________ ________________

    bL -I L 'I

    M _T()_2] Mmax = w( 4)

    i-.-- curved H straight k IIillWpj1'C 60E1 W(2#SOo2b,4Oab2-H/b)

    /SbI dmox 60E1dmax Jf(i+ i7)

    IA a b aL L s.j

    Mx IX Mx = MCM,,,x P a

    A [ I No shears1 N. B. For ant/clockwise moments

    the deflect/on is upwards.curved k fCU/hLk

    SEX C 2E1d=E2'(, Sb'

    1078 Bending moment, shear and deflection

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  • SIMPLY SUPPORTED BEAMS

    w/zL

    // T

    N

    _0122I'ZL/

    when x1

    'RB

    When xadjmt2n(2n)d#n2(242m]When xod4

    where mx/L and naa/L

    IA BT LRB

    R8WRA=RB T

    = S WL'"max 384 El

    94 R5

    Wa fSL2 c2jd,cx.= 96(1

    2 /ien

    .;

    RAfl\_______

    RB

    dmax j.j (8?_4Lb2#b3)

    Bending moment, shear and deflection 1079

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  • MA4nqx. O/28WL

    when x,=05774L

    L 84p8

    Mx = Wx( 2)WL/6

    II.x;. I

    = WISR8

    RB 2W/S4,dmcx

    0.0/304 wi!dinaxwhen x =05/PJL51AA BA

    T.a 'F b -F aL"A B

    I'"mar. 4 ('- 3J

    RA=RB =

    JdmaxWL5

    60(1

    Ij x 2X2Mx L"YLJ

    Mmax'Wi/i2

    RR8 wftj dc,s

    A5

    d, ur=i(85,7aLL4c2L4I)

    i,dmax.

    3iffk1

    1080 Bending moment, shear and deflection

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  • SIMPLY SUPPORT(O BEAMS

    ,l. ti.

    k"\M -'"cx. 6

    N'A=B= W/2

    NRa

    lOab# 5b2)

    6

    _____

    RB

    RA[ R8w/2

    4/max.

    dmxJi(/5a2#2Oabi'.5b2)

    N yzW/a-

    Lb

    Mmcx _(_m# 'j)iW,en x

    WmR8

    z_when x= a/i

    _______IA

    B .7

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  • SIMPLY SUPPORTED BEAMSP p

    L pa

    VA4nc P

    I I

    a>c

    ,,Ppib*Zc)"C L

    Pc(b#2a)MD L

    I I

    L HP(b *)L

    Pot central deflectionodd the values for each Pderived from the formulain the adjacent diagram.

    1

    M,,, T

    I I

    I IB'4R8 .

    J/nax.PL3

    ;nax.

    RA-R8-PJ/nax.

    -

    Pb/L Po/L

    always occurs within00774 L of tfie centre of the beo,nWhen ba,

    d PL3rsa Ia i7centre 48E1L L (LII

    This value is a/ways with/nS % of the maximum value.

    1082 Bending moment, shear and deflection

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  • PLMmax r PLMC Mf SPLMD

    RAI II JB

    dpd 23PL3mczx. 648(1

    /9 P1!dmax = 304(1

    2P

    4/PL3768(1

    = P

    dinax.

    d SJPLin ax.

    MC=ME

    A*C

    Bending moment, shear and deflection 1083

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  • SiMPLY SUPPOATED BEAMSpPppPP P

    LA (nI) forces BA'9

    pp p pb F AB

    MCflMDME!fL

    A4 A8 "2P;,2'max.

    When n is odd. (nL /) p1Mmax When n is even.

    Mmcx. n. PL/8

    R8'4B("')'%

    When n is oddPL3 r i7r it /When n /5 even

    dmaxiuu,p4,. . nft_ :# )Jd 6JPLmax. 1000E%

    TOTAL LOAD

    When n >10, consider the load uniformly distributedThe reaction at the supports = W/2, but the maximum SE

    at the ends of the beam W(n;/)11,AWThe value of the maximum bending moment C. WL

    The value of the deflection at the centre of the span k.

    Value otn A C k2 0 250O 0.1250 O 0/05S 0.3333 0/I/I 001184 03750 0.1250 00/245 Q.4 01200 0.0/266 04/67 OIZSO OO/277 O4286 0/224 00/288 04375 01250 00/289 04444 0/236 00l29/0 O4500 0.1250 00/29

    1084 Bending moment, shear and deflection

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  • SIMPLY SUPPORTED BEAMS

    L '.1

    A CI BA MA(,a + bI ___________

    1 L MA M4>M5 'M8MA Al8

    _

    Al4 1jt'M8Al. GIL MC8 Al . bIL (Al8 antic/ockw,M8

    _________________

    Shear diagram when MA "M8

    PAl Va R4( VsA4 A5 M/L Al4 MB

    As shown

    M.cb 'a b' When M4M8.dc-31 (zz) ML2For anti-clockwise moments dmcxaii ythe deections are reversed

    ____________________________

    2nd degree_parabola. W Complement of parabola.KiI '1L L

    Mx -i (m4-2m#m) Mx (mJm2#4m1_2m4) Mmq .LfL/6RAfl ______J R

    A4R5W/2 ,IA_R8_W/z

    dmqx

    a' 61WL3 28W1maz dmax

    Bending moment, shear and deflection 1085

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  • SIMPLY SUPPORTED BEAMS

    w unit /oao'C A 0 B

    -

    AAI_

    dc=o_4(jn3,Ln2_ i)(s-)Where

    /W.unit booCiA BAD

    -HNI L '1QH-

    ___ W(L#N)(LN)

    m.x/L ,,1.N/L

    /W.unFt /oaoCADBflL NHA5

    MA=MB=-

    4..',,rTA

    RDL,

    RA=RBWNd4f(fC

    wL2 N/6(1w unit

    _4J4j O5774L0 BE

    L IQHAMax. upward deflection is at 0.

    NIA

    1086 Bending moment, shear and deflection

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  • 8(J/LT/N BEAMS

    1p1

    WL

    WLMC

    4B WI?.10g/L .O s8L.12/L p

    WI!= 384(1

    V4a-4..b- "+ c4

    MA

    MA,b [e(4L-Je)- c 31'4L Jc)]B,bLY4t--7" (4L saj

    RA

    When r is the sinp/e support reactionM-M M-MA4 L _r3# L

    /W wI2 W12-- b -H L -4

    ENMA=MB

    = = w/2

    ____

    I /dflfl

    -J Wa / Ivinax=4f% (LOJ

    '-jvl'Ak- L -

    in

    MA=-.in (Jnr"em+o)M8_ jrn2 (4-3m) ,'Mmax'L,,2( 3si,)/2

    kx- When x=2(n,32m42)2

    RA= W(m-2) 8 = Wm(2-m)2 2ri,dna.

    uWhen a=4/2 and x1=O-445L

    WI!3JJ(%

    WI!c/C = 384(1

    When a = c.

    .Ey(L3#2Lba #4Lc?8a)

    Bending moment, shear and deflection 1087

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  • B/JILT-/N BEAMS

    LA L 8 A C ___M

    MA ___________M8 MA V NMB- WL 7/Qx 9x ) M - SWL

    #Mmax WL/233 N5Qn x=OS5L MWL//6MA = WI//S M8 = WL/iO

    -

    R8 RB

    R=O.SW R8=O7W RA=RB=W/24J22LFOS6L 22L

    WI!

    1.4W!!max. - 384E1

    when x, = 0 525L

    W/2 2W/L HI'a

    La- b+_aJ____CL4 F I.

    MA M8 (SL44aL_402) MA = M8 -WL//6M=WL/48

    JRBR8 W/2 A =R3 W/Z

    . L/2 H

    O-WL3364(1

    1088 Bending moment, shear and deflection

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  • B(//LT-/N BEAMS

    fwTw/a____L

    MAV NMaMA

    AB W/2____

    I /d________ 4

    Wa /dmax =

    2W/a

    bL

    MA =-J'2(Jo/obL)M3

    mAC. Mx =P.X+M3-2W(x.-bPInCB.Mx RB.X#M5

    A = (/OLsLa42a)2, prO,,

    W/2 W/a W/2-Y HJ

    a I b-f

    L

    1NMBMA Maz_R(4L_3a)

    = = W/2

    dmax = (/SLMa)

    W

    bI. L .1

    MA MB

    MA _!10L_15#502)M3 _lOL2(5L4t

    = (/oL-/sLa'#8a)R = '/5L ec)

    Bending moment, shear and deflection 1089

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  • BUILT/N BEAMSparabolic total /oao W

    JRa'!4 W/2

    F4axJ1.3 WL3d,,, 384E!

    Any symmetrical load WrA

    ______

    symmetrical diagram

    NMBMA = M8 A,JL

    where A5 is the area of the 'free'bending moment diagram

    ARB

    A =R8 = W/2A,

    - - I The fic.re shownis ha/f the bending

    * + moment diagramC 1* and +7fr- X, -H-X--- LareC.GI

    A5x AIX1lmaxatC ZETWhere A' is the area of the fixing

    moment diagram

    RA R8 W/2

    rA

    O4WL3dma 384 (2'

    a rb2br

    2 -2br-----

    aab r&_

    CM. f(JaL)M8c -M(3b-L)When

    '4I=P8 = slope of moment diagramM#M M#MEabWhen '2/L = in,

    M. L2m2(/_m)2(1_2m)2E%

    For ant/clockwise momentsreverse the deflect/ons

    con,c*mentparabo/p

    JM8A -M5=-WL//O

    MAV NMBAq rM8i.._WL/2O

    1090 Bending moment, shear and deflection

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  • BUILT/N BEAMSp p

    L/2 L/2 I-. b 8JJF. L

    MA L' Al5 MA LZ EEE3 M8- MA = - M5 = M = PL/8 MA=- M5 =

    _______

    Mc 2Pa2b__________ 1!

    A1_____ _____ A__________=P (iT) (I#2 *)= = /,,2

    1Q8 = z

    4mcx__

    I. Xp9 d Po3b3dinax = /92 El C d _ZPa2b3 WQnX="3EI(3L2a)2 JL-Za

    p p p p

    Pa MA/ \MB- __Pa(L-q) MA=MB=_JPLh6MAMB L

    MC MD = P02,'L MC =MD =RAfl AI ILJ I I

    PA=P'P

    PLdmax = /30(a)7

    Bending moment, shear and deflection 1091

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  • BUILT/N BEAMSP p p p

    ______ IrgfA C D'.L/y 1--L/j .L/j.

    MA MB MA LF- 5N M8MA =M = /9PL/72

    MD =1/

    PArJ__I LJARA = JP/2

    p p p P P p pII + + 1I

    MAVNMB MAL/L NEiNMBMA =M3=I/PL/j2MD = Mf = SPL/32

    max. = 96(1

    l,L/3 P.-L/3L2

    MA =M8 = 2PL/9MC =MD = PL/p

    AL I

    S PL3dmax 548?1 4/PL3

    A C D BLL/4--L/4 L/4 L/4 34C D E PBL/L/4 +L/4 +L/4 4L14

    MA=MB =rSPL/,6= JPL/15

    2P

    PL3dmax 96(1

    1092 Bending moment, shear and deflection

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  • BUILT/N BEAMS

    HJ-

    Y1F,enniso6 ,I / /Cimox 114-4c (,jiWhennis even,

    :.:i O...o.&. ,. 4;.' O44.EfIiiiitiIIIn CONTINUOUS BEAM

    }d L/n#-+-L/n4L/n+-L/-#L1-+-44L

    L. - When n >10, consider the load .nitorrrdy oYstiibuted -The load on the outside stringers is carried c'/rect/y by the supportsThe continuous beam Is assumed to be horizontal at each supportThe reaction at the supports for each s,oan = W/2. but the maximum

    shear force in any span of tM continuous beam = V/J.IAWThe value of the fixing moment at each support = B. WL

    The value of the maximum positive moment for each span = C. W4The value of the maximum deflection for each span 0'0O26Value ofn A B C

    2 02500 00625 00 6253 03333 0074/ 003704 03750 0078/ 00469S 04000 0-0800 004006 04/67 Qc// 004397 04286 0O8/5 00408B Q4375 00820 00 4309 04444 00823 004/3

    10 04500 00825 00425

    p pp pA C V t PL/5 +Lg +L,/s+L4

    ppppppp4 (n-i) forces B

    I I scev,naLJ,

    MA LNMB MAMA M52PL/5MD wM PL/5

    AArLMA=MB= P1,'/)

    'A B=2'

    d = 13PL3max. 1000 El

    COLUMN LOAD PER SA4NW

    Bending moment, shear and deflection 1093

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  • WL= ---

    WL3dmax. - ____

    PROPPED CAN T/L(VERS

    /WA C B

    Web LBA

    b.f- c.J

    L'

    MA7tSMA = d2-c2)(29c2_c12)

    -____

    L R8=r5Where and r3 are the simplesupport reactions for the beam

    (MA being considered positive)

    w/

    MA

    W

    A C B

    3L/8 - 9W!.C

    ___

    Ca

    -f-b

    MA= f (2n)2were a/Ln#MmaxRA -n (4-n)]

    RAi4J[8n2(4n)]1

    P3 Hn2( fl)

    dC(/_I2n#7n2_n)

    --_J P8P3 =f

    x/LmLA'max.

    d=j(m Jm3#2m)

    MA

    'P

    MA=

    A IJ2 (o - n 2)= f (n'-n-pi.e)

    a, d=J42/n3(3n?-6b5When x a.dj[2p4p3n (n-6n,'.8)+_________

    pn2(jn2_8n#6)]

    1094 Bending moment, shear and deflection

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  • PROPPED CANTILEVERS

    W/2 W/21' C U BA

    f a-HL

    MA

    if = % then between B and U.Al,. = ftx4xa(4 -Sm+Zm9]+M,n0x. when x=I'4Jm#2rn2,

    20)

    RB

    MAZ_1027SLf X/L = mx H

    Mx(2Qm'27m#7)A 7WL

    '''max.

    '9:4=0 67L]

    = (2i."#soi. 42)p8 = (2L2_30L#40')

    Vx i(9_rn2)A PB =

    - OO0/WL3ElWhen x=0598L

    W/? W/2

    -LMA

    RB

    3WLMA

    #MmaxO0454 WL[When x 0 283L]

    4W= T RB = * p_LA - /3WB - 32

    - 00047WL'dmax (IWhen x=O447L

    iiWhen x=0404L

    Bending moment, shear and deflection 1095

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  • PROPPED CANT/LEVERS

    a

    _____

    C B A A _____aL iR8 L A5___ ___

    0577bI S

    0/28 Wa

    MAMA

    _________________

    JLBQt we enCandA, Mx=R5.x-j!('x-b) M5=R5.x -

    (JaL/5aL#2OL2) =_ j9(si.2_j,2)#Mmox when xb# fI/-

    ___ RAt NJR5A8 =('5L a) = 9 (si!,/)

    W P5 A8 = (t+SaL2)2W

    2W W__________ ____________ -

    ____

    C______ ____a " b' 4a .. b IL R3 L

    H0577aH 0/28 Wafx Wab H042Jb

    MA

    When ,n=a/L 2 3m#2 I

    MC=AB.b MA=_f/0L2-3b2)Between AandC RA I

    =RAW52/a2 I_______________ Between C and B \}.x--H \ IRS Vx=RA_Wrc24Z NA8 = '('/SL 4a) A3 = [L(//L -/S,i#(5L- a)]

    RA=W-RB RA=W-RB

    1096 Bending moment, shear and deflection

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  • fAA 51 CD1. L

    I Wa2M5=2M Fc-'3'L 8TN

    IJA 8+ CD

    '1. L

    M'184 'C 0

    1.

    -Pa=

    q

    - 8 =-

    = j4p2,pq#Jp #Jq)d,n0x 27(1

    PROPPED CANTILEVERS

    W.iw4,

    .jwap

    d0 WL4f2(ep#4?q#dp3(p#i)J-Omax. 54(1

    TflM3 -2M4 =M

    4I

    dmaxIdo

    I0'O

    a#b)#a2(2# VJ'-dmax"

    Bending moment, shear and deflection 1097

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  • PROPPED CANT/LEVERS

    W/2

    AB

    Wa

    MA _4(2L_a)

    NBA -(4L?#ZaL az)

    W

    L kO.4/SLtq

    MA

    #MmaxOO948 WLA4flR,

    A32 B j/

    +

    na/L *7/q

    MA= f-(4L3a)W'?Qn X< a,tl =(9,r?x /2nx# /2x 4xg2)+Mmax occurs whQn

    A r\

    (4L2 #4aLJoTR8 W

    wIa +b +-a 4

    IL---R8MA7Z

    MArn (5L2+40L4G2)

    RAI\ I '?&A477(2/1!#4aL 4a2)

    A8

    1098 Bending moment, shear and deflection

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  • SWL

    M .('/Om-ZOm#7m)#My,OO888WL,when X

    0 3965L

    7PL7(%dmax'OOOPJ2 ft3

    coIr4oleraQnt of parabola!F051 SWL

    Mx =(-4om+8om-om4I7m)#Mmax*O0399WL,whQn x 02343L

    A6

    MAW-' lz' ,nax.MA-O./93PLwMn baO577L

    M=('Z-# p)maxA1-0./74PL

    A3=f3b#2L) RAPR5

    PROPPED CANT/LEVERS

    7WB

    MA

    A51

    F9

    Bending moment, shear and deflection 1099

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  • PROPPED CANT/LEVERS

    AC D EB*L/L/3 Lb

    Pp PA C D E+V4+L/4 +-/4

    ISPLMA = /7PL JJPLD "E7

    PALI

    PAJ3 J2dmax00209 zr

    P PP PLj.4C DEFBA

    0nczx. O.OZdS

    MA

    '4

    MA

    4P 2P

    dx 00152

    P P P

    MA MA

    /9PLMA= 48M -. M ....SJPL0 96 288

    dxOQ/69

    1100 Bending moment, shear and deflection

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  • PROPPED CANILEVEPSp p p pD E F19

    L/4tL/4tL/44L/MA

    P PPPP Ppforces B

    MAE7ZTJPL(,,?l)MA= 8nJSPLMA= -

    Ad /S7PLrT( 5/2

    P8

    GOOZZl

    RAEL (5n2-4n-i)RB = (34z_4fl#/)

    whennis!or9e, dmax. /85(1

    Any symmetrical load W

    AreaR L AreoS'BMA

    VAr000 XIf AArea of free B.MDiagramM-

    A8

    P =!82 L

    JA ____I.

    a=L

    a>O423L _rcO423La< O423L

    M1 9(2_6n#sn')MCA (2 6n# Pn?3ni

    -SnIt'B

    LIn Case!, R SM/ZL

    CaseS, A= M/L

    dmax occurs at point correspondingto Xon M diagram, the area Abeing equal to the area 0

    Area SXxVmax =

    Bending moment, shear and deflection 1101

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