Step by Step Design of PSC Girder by Working Stress Method

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    DESIGN OF PSC GIRDER

    WORKING STRESS METHOD

    1.0 SALIENT FEATURES AND DESIGN DATA1 c/c of pier to face of irt!a"" #

    $ a%&"e of '(e! #

    ) Spa% * c/c of +eari%&', #

    - "e%&t of preca't &irer #

    Spa% * c/c of teporar '2pport' , for preca't &irer #

    3 No of &irer' #

    4 c"c i'ta%ce of te &irer' #

    5 c"ear carria&e !a #

    6 !it of footpat 7 A89 #

    10 !it of eia% #11 O:era"" !it of te ec( #

    1$ !it of ec( '"a+ +eo% ce%tre "i%e of o2ter &irer #

    1) tic(%e'' of ec( '"a+ #

    1- tic(%e'' of e% iapra& #

    1 Grae of co%crete for ;S8 &irer M

    for R88 ec( '"a+ M

    T

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    # ).000

    "* PROPER+IES OF CO'POSI+E SEC+ION

    A # 1.),1 #

    # 0.-8- #

    # 1.(1- #

    $.$ SE8TION AT SU;;ORT *1=$,

    'ae a' a+o:e for iffere%t 'ectio%'

    ).0 8AL8ULATION OF 9ENDING MOMENTS AND SHEAR

    FOR8ES AT @ARIOUS SE8TIONS

    ).1 9M SF DUE TO SELF WEIGHT OF GIRDER

    ).$ 9M SF DUE TO DIA;HRAGMS

    ).) 9M SF DUE TO INSITU DE8K SLA9

    ).- 9M SF DUE TO SU;ERIM;OSED DEAD LOAD

    ). 9M SF DUE TO @EHI8ULAR LI@E LOAD

    ).3 9M SF DUE TO FOOT;ATH LI@E LOAD

    ).4 SUMMAR< OF 9ENDING MOMENTS AND SHEAR FOR8ES AT

    @ARIOUS SE8TIONS

    -.0

    (.1 * CA/E POSI+IONS A+ 'IDSPAN AND ANCORAGES

    c!"e o 1

    Tpe of ca+"e # 5 T 1)

     Area of ca+"e 65.4- # 456.6$

    UTS # 156.4$0-45

    a' of pre'tre'' $1

    Tota" "e%&t of &irer # $-.300

    Di'ta%ce of A%cora&e fro Mi 'pa% # 12.200

    DIS+ANCES OF ARIO3S SEC+IONS FRO' S3PPOR+ AND 'IDSPAN

    C!"e fo&ce

    8a+"e' are 'tre''e fro +ot te e%.

    8a"c2"atio% of force' i% te ca+"e' +efore a% after '"ip *'"ip # 3

    $ Ic# $

    t%

    t

     $" %"

    8A9LE ;ROFILE OF O3+ER GIRDER 4G15G-*

    $.

    (&/$.

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    Sectio% "e%&t of ( # 0.00$ A%&"e 2 # 0.14

    'ectio% teta ca"c2"ate

    " i% *, (B" µ∗θ for eac

    Fo&ce Di!#&!

    8a"c2"atio% of '"ip

    SUMMAR< OF 8A9LE FOR8E AFTER SLI;C

    HORIONTAL 8A9LE FOR8E 8OM;ONENTS *F # ;8OS*,,

    @ERTI8AL 8A9LE FOR8E 8OM;ONENTS *F # ;SIN*,,

    *CA/E E/ONGA+ION

     E"o%&atio% # f > L !ere= A > E f # A:era&e ca+"e force at refere%ce 'ectio%

    L # Le%&t of ca+"e *i% ,

     A #

    E #

    4.0 EFFE8T OF FIRST STAGE ;RESTRESS

    4.1 STRESSES IMMEDIATEL< AFTER I't STAGE ;RESTRESS

    4.$ 8AL8ULATION OF LOSSES DUE TO I't STAGE ;RESTRESS

    1 * /osses d7e to c&ee i coc&ete

    * c".11.$ of IR8C15 $000 ,

    8reep 'trai% i% perio +et!ee% ) a' (2

    10 a' ,,

    6.$$E0- .-0E0- # ).5$E0- per 100 (&/c$ 'tre'' i% c

    ce%troi of pre'tre''i%& 'te

    # ).5$E00- >

    # $.05E0-

    # creep 'trai% > o2"2' of e

    # $.05E0- >

    # (0-.))

    2 * /osses d7e to sh&i:!#e of coc&ete

    * c".11.) of IR8C15 $000 ,

    Sri%(a&e of co%crete i% te perio of - ) a' a% 10

    >#(∗"7µ∗θ e>

    θ i% ra

     Area of ca+"e *i% $,

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    # 0.000-) 0.000) # 1.)0E0-

    # 1.)0E0- >

    # 2-).-0

    ) * /oss d7e to E!stic sho&tei# * c".11.1 of IR8C15 $000 ,

    # 1.6E703

    # -000 Fc

    # 000 $0

    # $$)30.3465

    # $$)303.465

    Mo2"ar ratio # 1.6E703 # 5.4$

    $$)303.465

    Lo'' D2e to E"a'tic Sorte%i%& # -.-1 >

    $# 2),.26

    ( * /oss d7e to &e!

    * c".11.- of IR8C15 $000 ,

    U"tiate te%'i"e 'tre%&t of !ire' # 18.,))

    U"tiate te%'i"e 'tre%&t of  19 + 1) te%o% # 16

    # ).6)

     Area of eac 'tra% # 0.98,(

    No. of ca+"e' # $.00 * $.00 of 16 T 1)E2i:a"e%t N 16 T 1) ca+"e' # $ > 15.4303

    15.4303

    # $.00

      Referri%& c". of De'i&%

     A:era&e force i% ca+"e'

    # 299.)) = )01.,9 = )0-.), =

    6

    # )03.)$ t.

    # )03.)$ UTS

    ).6) > $

    # 0.-)0 UTS

     A:era&e 'tre'' i% ca+"e' # )03.)$ > 1.00E70)

    $.00 > 15.43

    Lo'' 2e to re"a>atio% of H # 513).6) > )

    # >21).)(

    :#;c2.

    Mo2"2' of E"a'ticit of Stee"= E' (&/c$.

    Mo2"2' of E"a'ticit of 8o%crete= Ec

    (&/c$.

    :#;c2.

    ...

    :#;c2.

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    Tota" "o'' # -0.)) 7 $). 7

    # 682.,-

    a&e "o'' # 35$.4 > 100 #

    513).6) a&e "o'' 2e to e"a'tic 'orte%i%& # $)4.$3 > 100

    513).6)

    i.e Ist!t!eo7s oss # 2.91

    9a"a%ce "o'' # 5.)3 $.61

    .-3

    $0 i&er "o'' # 6.--

    5.0 EFFE8T OF SE8OND STAGE ;RESTRESS

    5.1 STRESSES IMMEDIATEL< AFTER II% STAGE ;RESTRESS

    5.$ 8AL8ULATION OF LOSSES DUE TO II% STAGE ;RESTRESS

    'ae a' i% 1't 'ta&e

    5.) ADDITIONAL LOSS IN I't STAGE DUE TO II% STAGE ;RESTRESS

    1 *  Aitio%a" 'tre'' c.& of 8a+"e' # ErrC1$ -.-1

    # E&&?-12

    2 * /oss d7e to C&ee i coc&ete

    8reep 'trai% i% co%crete # .-0E0- > ErrC1$

    100 100

    # ErrC1$

    Lo'' 2e to 8reep i% co%crete # ErrC1$ > 1.6E703

    # E&&?-12

    ) * /oss d7e to Sh&i:!#e i coc&ete

    Sri%(a&e 'trai% at $% 'ta&e # ).00E0-

    Lo'' 2e to 'ri%(a&e i% co%crete # ).00E0- > 1.6E703

    # -8-.00

    ( * /oss D7e to E!stic Sho&tei# # ErrC1$ > 3.3)

    $

    # E&&?-12

    # ErrC1$ 7 ErrC1$

    # E&&?-12

    Lo'' # ErrC1$ > 100

    513).6)

    ErrC1$

    $0 i&er "o'' # E&&?-12

    ...

    :#;c2.

    ...

    ...

    :#;c2.

    ...

    :#;c2.

    ...

    :#;c2.

    :#;c2.

    ... +ot! /oss

    :#;c2.

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    6.0 STRESS DUE TO DIFFERENTIAL SHRINKAGE

    For A&e of ;reca't U%it 2pto 90 a'

    Differe%tia" 'ri%(a&e 'trai # 2.00E>0(

    re2ctio% factor for creep effect M -

    o2"2' of e"a'ticit of co%crete # 000.00 >J Fc# 000.00 >J -

    Differe%tia" ' # 5.30E0 > ).)E70

     Area of effecti:e ec( '"a+ # )00.000 > $.0

    Te%'i"e force i% te '"a+ 2e to iffere%tia" 'ri%(a&e

    Moe%t i% te &irer 2e to iffere%tia" 'ri%(a&e

    10.0 RE8A;ITULATION OF STRESSES U;TO SER@I8E

    10.1 8HE8K FOR STRESSES AT @ARIOUS STAGES OF LOADING

    I * CEC@ FOR 'AI'3' CO'PRESSIE S+RESSES

     A' per c".4.1 of IR8C15 $000

    Te 8opre''i:e 'tre'' i% te e>tree fi+re of co%crete ieiate" after pre'tre''i%& or afte

    te tra%'fer of pre'tre'' +efore a""o!i%& for f2rter "o''e' 2e to 'ri%(a&e creep 'a"" %ot

    e>ceeC

    i , 0.(- > c2+e 'tre%&t at te tie of tra%'fer 

     A' per c".4.$ of IR8C15 $000

    Te copre''i:e 'tre'' i% te e>tree fi+re of co%crete after a""o!i%& for a"" "o''e' eiter 2ef2"" D.L or f2"" D.L L.L 'a"" +e 0.)) fc(C # 0.)) >

    # 1(8.-0

    1 * S+RESS CEC@ I''EDIA+E/$ AF+ER 1st S+AGE PRES+RESSING

      Referri%& c". of De'i&%

    Ma>. 8opre''i:e Stre'' # ,0.(8   * At Sectio%

      Te 1't Sta&e ;re'tre''i%& i' o%e after ) a' of ca'ti%& of &irer or

    te co%crete a' attai%e a c2+e 'tre%&t of 200

    Te a>. peri''i+"e cop. 'tre''C

    i , 0. > $00 # 100

    +he !

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    Te $% Sta&e ;re'tre''i%& i' o%e after 10 a' of ca'ti%& of &irer or

    te co%crete a' attai%e a c2+e 'tre%&t of )(6.-

    Te a>. peri''i+"e cop. 'tre''C

    i , 0. > )-3. # 14).$

    +he !

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    11.0 ULTIMATE STRENGTH 8HE8K

    ( Vide cl.12 of IRC:18 - 2000 )

    REF * F!i7&e " $ied of Stee

    Mult = 0.9 x db x As x fp

    !e"eAs = A"e# of !i$! te%sile steel

    fp = t!e ultite te%sile st"e%$t! of steel

    db = t!e dept! of t!e be#& f"o& t!e i&u& co&p"essioc$ of steel te%do%s

    REF * F!i7&e " c&7shi# of coc&ete i co&essio oe

    Mult =

    !e"e

    b = idt! of eb= t!e idt! of '#%$e

    t = t!ic%ess of '#%$e

    1$.0 SHEAR FOR8E 8AL8ULATION

    1$.1 8AL8ULATION OF SHEAR REINFOR8EMENT AT @ARIOUS SE8TIONS

    1$.$ MA SHEAR AND 8ORRES;ONDING 9ENDING MOMENT

    @2 # 1.$ * S.F1 7 S.F$, 7 $ * SF), 7 $.*S.F-,

    M2 # 1.$ * M1 7 M$, 7 $ *M), 7 $.*M- ,

    ( t - & )

    c* she!& &eifo&ceet

    1$.) 8HE8K FOR MAIMUM SHEAR

    M#xi&u& s!e#" fo"ce = bd x 0.0- ( t )

    0.1*+ bd+$f 

    c(  $,

    ) 0.8(

    f -b)(d

    +-t,2) x t f 

    c(

    !* 3ti!te she!& &esist!ce of sectio 7c&!c:ed i fe

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    1$.- ;RO@ISION FOR HORIONTAL SHEAR

    o"i3o%t#l s!e#" st"ess =

    1$. DESIGN OF TRANS@ERSE REINFOR8EMENT

    ("efe" cl +11.4 IRC:22-198+)

     5!e lo%$itudi%#l s!e#" fo"ce V6 pe" u%it le%$t! s!#ll %ot exceed

    (i) 0.76s fc 6s = le%$t! of s!e#" pl#%e(ii)

    As = u& of c,s #"e# of ste

    As V6 - 0.086s fc

    1).0 DEFLE8TION 8AL8ULATIONS

    M#x. de'ectio% u%de" # 6 c#usi%$ # . &o&e%t of ; M ; :

    = - x

    (8 < I

    !e"e >6 =

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    0.7 0.2

    = 0.2170

    = M#x. p"est"essi%$ fo"ce #t #%c!o"#$e e%d

    = t.

    = 0.217

    0

    = 0.217 x 0

    = 0.00 t.

    e"&issible st"ess fo" e - 714 st = 0.8* x 7140

    = /+10.4

    A"e# of steel "eDui"ed = 0.00 = 0.00

    /+10.4

    P&ovided SPIRA/

      20 5 8 &o7ds 1 o

    A"e# of ste = /.172 x 8 x 1

    = 2-.1)

    B 0.00 SAFE

    16.0 +ee&!t7&e #&!diet?

     5!e te&pe"#tu"e $"#die%t e?ect s!#ll be e@#lu#ted #s pe" IRC: + fo" "ise #%

     5!e e?ect of te&pe"#tu"e di?e"e%ce it!i% t!e C $i"de" #%d dec sl#b s!

    positi@e #%d "e@e"se te&pe"#tu"e di?e"e%ces #s s!o% i% E$ belo.

    1*.8 10.+

    !1=0./!F0.14& !1 7 0.*

    !2=0./!F0.10& !2

    0.8

    !/=0./!F0.14& !/

    2.1 +.+

    +'t

    (

    (

    +'t

    ... +'t

    $,c&$.

    ...

    c2.

    c2. ...

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    positi@e te&pe"#tu"e di? "e@e"s

     5!e p"ocedu"e #dopted fo" lo%$itudi%#l #%#lsis fo" te&pe"#tu"e $"#die%t is

    i% t!e text G"id$e ec e!#@iou"G b C. #&bl.

    Assu&e t!#t t!e dec expe"ie%ces te&pe"#tu"e c!#%$e !ic! i%duces st"es

    "i$idl "est"#i%ed t!"ou$!out #%d t!e% t!e e?ects of "ele#si%$ t!e t!eo"eticsupe"i&posed.

    Sectio &oe&ties?

     5!e t!e"l st"esses s!#ll be e@#lu#ted fo" e#c! of t!e lo%$itudi%#l &e&be

    sep#"#tel fo" di?e"e%t dept! #%d fo" solid sl#b i% t!e c#%tile@e" po"tio% #%d

    HR t!e te"i#l p"ope"ties s!#ll

    #) CoeJcie%t of t!e"l exp#% = 0.0000114

    fo" co%c"ete #%d steel

    b) Modulus of el#sticit = 0.4 ti&es t!e s!o"t te"& &odulu

    = 0.4 x /./4

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    REF

    REF

    HR

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    HR

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    HR

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    REF

    1

    e&

    %o'

    (0

    (0

    2>6

    $

    0.1990

    0.22),

    0.2)12

    >

    -

    )

    )

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    0.--)

    0.9(-

    0.)90

    -

    ,>1,

    4

    6

    11

    1$

    1)

    1

    13

    15

    at ac( e%,

    -

    )

    )

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    *i% (N,

    # 0 T 1) > 65.4-

    #

    # 1.6E70-

    $6

    )0

    )1

    at2rit a%

    at2rit

    %crete at te

      e".

    -.-1

    100

      "a'ticit of H.T 'tee"

    1.6E703

    a'

    $.

    N/$.

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    1.6E703

    * c".10.1.1 of IR8C15 165 ,

    * c".10.$ of IR8C15 165 ,

    'tre'' i% co%crete at te

    tie of 'tre''i%&

    5.4$

    to%%e'

    > 15.4))

    to%%e'

    7 0 of  16 T 1)7 0 > 15.4303

    )08.)9 = )10.(9 = )12.-6

    # 816).9)--

    > 0.54

    c$.

    :#;c2.

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    $1).)- 7 $)4.$3

    5.)3

    ))

    )-

    )4

    )5

    7 5.00

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    )6

    # 0.-)0

    # ))-10.$

    # 28.8-

    # 400

    # $13))6.44 (&

    # 216.)( t

    -0

    -)

    o-0

     - > - ,

    after

    SAFE

    (&/c$.

    :#;c2.

    c$.

    :#;c2.

    ...

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    after

    6 > 6 ,

    *Sectio% 6 > 6 ,

      * At Sectio%  ( > ( ,

      * At Sectio%  6 > 6 ,

      * At Sectio% 6 > 6 ,

    :#;c2.

    ...

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    -

    % ed$e to t!e

    -4

    -5

    1

    -

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    3

    el pe" u%it le%$t!

    4

      'ectio%.

    6

    1-1

    x 0.04//

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    f#ll i% te&pe"#tu"e

    ll be de"i@ed f"o& t!e

    0.24 !1=0.2! F 0.24&

    0.24 !2=0.2! F 0.24&

    0.2 !/=0.24! F 0.2&

    0.2 !7=0.24! F 0.2&

    c2.

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     te&pe"#tu"e di? 

      #s $e%e"#ll discussed

    ses !ile t!e dec is

    l "est"#i%ts #"e

    s of t!e $"id

      s!#ll be #s s!o% belo.

    e

    s

    2

    /7.88

    *.87

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    7.12

    c& f"o& c$

    c& f"o& c$

    c& f"o& c$

    c& f"o& c$

    $c&

    t&

    HR

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    HVA6

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    12.9/

    c& f"o& c$

    c& f"o& c$

    c& f"o& c$c& f"o& c$

    c& f"o& c$

    $c&

    HR

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    HR

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    REF * CA/C3/A+ION OF ENDING 'O'EN+ AND SEAR FORCES A+ ARIO3S

    SEC+IONS

    Fo""o!i%& 'ectio%' are co%'iere for te e'i&% of ;S8 &irer 

    Sectio% 00 '2pport

    Sectio% 11 e% of tic(%i%& of !e+

    Sectio% $$ i of tic(%i%& of !e+

    Sectio% )) 'tart of tic(%i%& of !e+

    Sectio% -- 0.)L

    Sectio% 0.-L

    Sectio% 33 0.L i 'pa%

    REF I ENDING 'O'EN+ D3E +O SE/F EIG+ OF GIRDER 4'1*Wei&t of i'pa% 'ectio% # REF >

    Wei&t of '2pport 'ectio% # REF >

    Wei&t of e% tic(%i%& #

    9.M S.F. at :ario2' SE8TION

    'ectio%' 2e to 11 $$

    SELF WEIGHT

    M 1 0.00 )4.00

    S.F. 1 0.00 0.33

    REF ENDING 'O'EN+ D3E +O INSI+3 DIAPRAG' = DEC@ S/A 4'2*

    8a"c2"atio% of !ei&t of ec( '"a+

    !it of ec( '"a+ o% &irer #

    tic(%e'' of ec( '"a+ #

    !ei&t of ec( '"a+ #

    Diapra& # REF > REF >

    9.M S.F. at :ario2' SE8TION

    'ectio%' 2e to 11 $$

    iapra&

    M $ 0.00 $3.00

    S.F. $ 0.00 0.-4

    ).) ENDING 'O'EN+ D3E S3PERI'POSED DEAD /OAD 4')*

    9e%i%& oe%t 2e to '2peripo'e ea "oa i' ta(e% fro o2tp2t of Gri a%

    S2peripo'e ea "oa

    UDL o% o2ter e+er 

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    Reactio% 2e to cra'+arrier

    o% &irer G1 a% G)

    *a, cra' +arrier # 0.))) >

    *+, !eari%& coat f"oor "oa # 0.03 >

    *c, rai"i%& # 0.$ >

    9.M S.F. at :ario2'

    'ectio%' 2e to 11 $$

    SIDL

    M ) 3-.00 6.$0

    S.F. ) 0.00 4-.)

    ).( ENDING 'O'EN+ AND SF D3E +O EIC3/AR /IE /OAD 4'(*

    C!ss ,0R wheeed c&itic!

    IM;A8T FA8TOR # 1 7

    9.M S.F. at :ario2'

    'ectio%' 2e to 11 $$

    LL c"a'' 40R

    M - 101.00 51.13

    S.F. - 0.00 -.63

    LL i%c" ipact

    M - 0.00 0.00

    S.F. - 0.00 0.00

    C!ss A 2 !es

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    4*-48 i"de" 1-l#te"#ll de'ected M#x &o&e%t

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    M#x "e#ctio%s

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    -+.217 0 -102.1/

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    2 &o&e%ts

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    Re#ctio%

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     5o"sio% L Mo&e%t-B Mo&e%t- L-&

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    &o&e%ts - 7

    e#& 6,C Lode Axi#l o"ce!e#"-B L !e#"- L5o"sio% L Mo&e%t-B

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    Re#ctio%s

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    /+/.24* 191 1 /71 0 -44.882 0

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     5o"sio% L Mo&e%t-B Mo&e%t- L-&

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