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T.Chhay



                                PaBdabrbs;Fñwm edayviFIGnuKmn_eTal
                            Deflection of beam: Singularity function method

                 ¬GñkR)aCJCnCatiGg;eKøs¦ )aneRbIvg;RkckRsYc ¬Point brackets¦ EdlehAfa vg;Rkck
          Macaulay

Macaulay edIm,IrkPaBdab y nigmMurgVil θ rbs;Fñwm.

       x−a =⎨
                 ⎧0
                  n          ebI x − a ≤ 0
                 ⎩ ( x − a ) ebI x − a > 0
                                 n



      Macaulay )aneFVIGaMgetRkal dUcteTA³
                                         n +1
                         x−a
          ∫   x − a dx =
                   n

                          n +1
1> smIkarm:Um:g;
   k> krNIr)arrgbnÞúkeTal P EdlmanGab;sIus a                                                          P

     M = RA x − 0 − P x − a
                        1                 1


                                                                    A
     M = RA x − P x − a
                   1                 1
                                                                                     a
    •   cMeBaHbnÞúkeTal eKRtUveRbIsVy½KuN “1”                               RA

    x> krNIr)arrgm:Um:g; M                                                               Mo                   M1
     M = −M o x − a + M 1 x − l
                            0                       0



    •   cMeBaHm:Um:g;EdleFVIeGayvilRsbTisRTnicnaLika viC¢man                     a

    • cMeBaHm:Um:g; eKRtUveRbIsVy½KuN “0”
                                                                                         l

    K> krNIr)arrgbnÞúkBRgayesμI w                                                                 w

              w       w
     M =−       x−a +   x−l
                   2                            2
                                                                        a
              2       2
    •  cMeBaHbnÞúkBRgayesμI eKRtUveRbIsVy½KuN “2”                                    l


2> ]TahrN_GMBIkarsresrsmIkarm:Um:g;
   k> cUrsresrsmIkarm:Um:g;edayeRbIviFI GnuKmn_eTal
   1> rkRbtikmμTMr                                                           100kN.m

                                                        A                                                 B
     ∑ M A = 0 ⇒ 100 − 10 RB = 0                               6m                            4m

     ⇒ RB = 10kN                                        RA                                                    RB
     ∑ Y = 0 ⇒ − R A + RB = 0
     ⇒ R A = 10kN
    2> smIkarm:Um:g;

PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal                                                                             106
T.Chhay



       M = − R A x − 0 + 100 x − 6 + RB x − 10
                            1               0                         1



       ⇒ M = −10 x + 100 x − 6 + 10 x − 10
                        1               0                         1



       edaysar x = 10m ⇒ x − 10 = 0 ⇒                   x − 10 = 0
                                                                  1



       ⇒ M = −10 x + 100 x − 6
                        1               0



       x> cUrsresrsmIkarm:Um:g;edayeRbIviFI GnuKmn_eTal
       1> rkRbtikmμTMr                                                                           4000N
                                                                                                                 1600N/m
       ∑ M A = 0 ⇒ 4000 × 2 + 1600 × 4 × 7 − 9 RB = 0
       ⇒ RB = 5866.6 N                                A                                                                       B
                                                                                            2m           3m              4m
       ∑ Y = 0 ⇒ R A − 4000 − 1600 × 4 + RB = 0
                                                                                  RA                                                RB
       ⇒ R A = 4533.4 N
       2> smIkarm:Um:g;
                                   1600          1600
       M = R A x − 0 − 4000 x − 2 −      x−5 +         x − 9 + RB x − 9
                        1                   1 2             2           1

                                     2             2
                                         1600          1600
       ⇒ M = 4533.4 x − 0 − 4000 x − 2 −
                         1             1
                                                x−5 +
                                                     2
                                                              x − 9 + 5866.6 x − 9
                                                                   2                                                 1

                                           2              2
       edaysar x = 9m ⇒ x − 9 = 0 ⇒                       1
                                                    x−9 = x−9
                                                                                  2
                                                                                      =0
       ⇒ M = 4533.4 x − 4000 x − 2 − 800 x − 5
                                    1               1                         2



3> ]TahrN_GMBIkarkMNt;PaBdabrbs;Fñwm
   k> cUrsresrsmIkar y nig y' edayeRbIviFI GnuKmn_eTal                                                        300N

   1> rkRbtikmμTMr
       ∑ M A = 0 ⇒ 300 × 2 − 3 × RB = 0                                               A                         C                 B
                                                                                                         2m              1m
       ⇒ RB = 200 N
                                                                                       RA                                     RB
       ∑ Y = 0 ⇒ R A + RB − 300 = 0

       ⇒ R A = 100 N
       2> smIkarm:Um:g;
       M = R A x − 0 − 300 x − 2 + RB x − 3
                        1               1                     1



       ⇒ M = 100 x − 300 x − 2 + 200 x − 3
                        1               1                         1



       3> smIkarDIepr:g;EsülénExSeGLasÞic
          X
                EIy" = − M = −100 x + 300 x − 2 − 200 x − 3
                                        1                         1                        1

   Y

          eFVIGaMgetRkalelIkTI1 eyIg)an
              EIy' = −50 x + 150 x − 2 − 100 x − 3 + C1
                                2               2                         2



PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal                                                                                            107
T.Chhay



          eFVIGaMgetRkalelIkTI2 eyIg)an
                     50 3              100
          EIy = −       x + 50 x − 2 −     x − 3 + C1 x + C2
                                    3           3

                      3                 3
          rkefrGaMgetRkal C & C      1   2


          Rtg;TMr A
          x =0⇒ y =0

          ⇒ C2 = 0
          Rtg;TMr B
          x =3⇒ y = 0
               50               100
          0 = − 33 + 50 3 − 2 −     3 − 3 + 3C1 + 0
                             3           3

                3                3
          ⇒ C1 = 133
          CMnYstMél C & C eyIgTTYl)ansmIkarPaBdab nigmMurgVil
                         1      2

               1     50 3              100
          y=      [−    x + 50 x − 2 −     x − 3 + 133x]
                                    3           3

               EI     3                 3
                1
          y' =    [−50 x + 150 x − 2 + 100 x − 3 + 133]
                         2           2          2

               EI
          - sMrab;kMNat; AC : 0 < x < 2m
                     1    50
          * y AC =      (− x 3 + 133x)
                     EI    3
                      1
          * y ' AC =    (−50 x 2 + 133)
                     EI
          - sMrab;kMNat; CB : 2 < x < 3m
                    1    50
          * yCB =      [− x 3 + 50( x − 2) 3 + 133x]
                    EI    3
                     1
          * y 'CB =    [−50 x 2 + 150( x − 2) 2 + 133]
                    EI
    x> cUrsresrsmIkar y nig y' edayeRbIviFI GnuKmn_eTal
    1> rkRbtikmμTMr                                                                                600N
                                                                       400N/m
     ∑ M A = 0 ⇒ 400 × 3 × 2.5 − 6 × RD + 600 × 8 = 0     A                              D
                                                                   B            C                    E
     ⇒ RD = 1300 N                                            1m        3m          2m        2m

     ∑ Y = 0 ⇒ R A + RD − 400 × 3 − 600 = 0              RA                              RD

     ⇒ R A = 500 N
    2> smIkarm:Um:g;

PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal                                                                   108
T.Chhay


                                   400        400
       M = RA x − 0 −                  x −1 +     x − 4 + RD x − 6 − 600 x − 8
                           1               2           2          1            1

                                    2          2
       ⇒ M = 500 x − 200 x − 1 + 200 x − 4 + 1300 x − 6 − 600 x − 8
                           1                    2              2          1        1



       3> smIkarDIepr:g;EsülénExSeGLasÞic
          X
                 EIy" = − M = −500 x + 200 x − 1 − 200 x − 4 − 1300 x − 6 + 600 x − 8
                                               1           2          2            1           1

   Y

          eFVIGaMgetRkalelIkTI1 eyIg)an
                                           200        200
              EIy' = −250 x +                  x −1 −     x − 4 − 650 x − 6 + 300 x − 8 + C1
                                   2               3           3           2           2

                                            3          3
          eFVIGaMgetRkalelIkTI2 eyIg)an
                         250 3 200        200       650
              EIy = −       x +    x −1 −     x−4 −     x − 6 + 100 x − 8 + C1 x + C2
                                       4         4           3           3

                          3     12        12         3
          rkefrGaMgetRkal C & C            1    2


          Rtg;TMr A
              x =0⇒ y =0

              ⇒ C2 = 0
          Rtg;TMr D
              x =6⇒ y =0
                  250 3 200        200       650
              0=−    6 +    6 −1 −     6−4 −     6 − 6 + 100 6 − 8 + 6C1 + 0
                                4         4           3           3

                   3     12        12         3
              ⇒ C1 = 1308
          CMnYstMél C & C eyIgTTYl)ansmIkarPaBdab nigmMurgVil
                               1       2

                   1     250 3 200            200          650
              y=      [−     x +     x −1 −        x−4 −        x − 6 + 100 x − 8 + 1308 x]
                                           4             4            3            3

                   EI     3      12            3            3
                   1            200          200
              y' =    [−250 x +     x −1 −        x − 4 − 650 x − 6 + 300 x − 8 + 1308]
                              2          3             3            2            2

                   EI            3            3
          rkPaBdabkNþalElVg
          eyIgCMnYs x = 3m eTAkñúgsmIkar y
                       1    250 3 200             200            650
              y x =3 =   [−      3 +      3 −1 −       3−4 −          3 − 6 + 100 3 − 8 + 1308 × 3]
                                              4              4             3           3

                      EI     3       12            3              3
                          1    250 3 50 4
              ⇒ y x=3 =     [−     3 +      2 − 0 − 0 + 0 + 1308 × 3]
                         EI     3       3
                         1941
              ⇒ y x =3 =      m
                          EI
          rkPaBdabRtg;cMnuc E
          eyIgCMnYs x = 8m eTAkñúgsmIkar y

PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal                                                                    109
T.Chhay


                  1    250 3 200            200         650
          y x=8 =   [−      8 +      8 −1 −      8−4 −      8 − 6 + 100 8 − 8 + 1308 × 8]
                                         4           4           3           3

                 EI     3       12           3           3
                     1    250 3 50 4 50 4 650 3
          ⇒ y x=8 =    [−     8 +      7 −     4 −     2 + 0 + 1308 × 8]
                    EI     3       3       3        3
                    1814
          ⇒ y x=8 =      m
                     EI




PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal                                                          110

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11b.deflection of beam singularity function method5

  • 1. T.Chhay PaBdabrbs;Fñwm edayviFIGnuKmn_eTal Deflection of beam: Singularity function method ¬GñkR)aCJCnCatiGg;eKøs¦ )aneRbIvg;RkckRsYc ¬Point brackets¦ EdlehAfa vg;Rkck Macaulay Macaulay edIm,IrkPaBdab y nigmMurgVil θ rbs;Fñwm. x−a =⎨ ⎧0 n ebI x − a ≤ 0 ⎩ ( x − a ) ebI x − a > 0 n Macaulay )aneFVIGaMgetRkal dUcteTA³ n +1 x−a ∫ x − a dx = n n +1 1> smIkarm:Um:g; k> krNIr)arrgbnÞúkeTal P EdlmanGab;sIus a P M = RA x − 0 − P x − a 1 1 A M = RA x − P x − a 1 1 a • cMeBaHbnÞúkeTal eKRtUveRbIsVy½KuN “1” RA x> krNIr)arrgm:Um:g; M Mo M1 M = −M o x − a + M 1 x − l 0 0 • cMeBaHm:Um:g;EdleFVIeGayvilRsbTisRTnicnaLika viC¢man a • cMeBaHm:Um:g; eKRtUveRbIsVy½KuN “0” l K> krNIr)arrgbnÞúkBRgayesμI w w w w M =− x−a + x−l 2 2 a 2 2 • cMeBaHbnÞúkBRgayesμI eKRtUveRbIsVy½KuN “2” l 2> ]TahrN_GMBIkarsresrsmIkarm:Um:g; k> cUrsresrsmIkarm:Um:g;edayeRbIviFI GnuKmn_eTal 1> rkRbtikmμTMr 100kN.m A B ∑ M A = 0 ⇒ 100 − 10 RB = 0 6m 4m ⇒ RB = 10kN RA RB ∑ Y = 0 ⇒ − R A + RB = 0 ⇒ R A = 10kN 2> smIkarm:Um:g; PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal 106
  • 2. T.Chhay M = − R A x − 0 + 100 x − 6 + RB x − 10 1 0 1 ⇒ M = −10 x + 100 x − 6 + 10 x − 10 1 0 1 edaysar x = 10m ⇒ x − 10 = 0 ⇒ x − 10 = 0 1 ⇒ M = −10 x + 100 x − 6 1 0 x> cUrsresrsmIkarm:Um:g;edayeRbIviFI GnuKmn_eTal 1> rkRbtikmμTMr 4000N 1600N/m ∑ M A = 0 ⇒ 4000 × 2 + 1600 × 4 × 7 − 9 RB = 0 ⇒ RB = 5866.6 N A B 2m 3m 4m ∑ Y = 0 ⇒ R A − 4000 − 1600 × 4 + RB = 0 RA RB ⇒ R A = 4533.4 N 2> smIkarm:Um:g; 1600 1600 M = R A x − 0 − 4000 x − 2 − x−5 + x − 9 + RB x − 9 1 1 2 2 1 2 2 1600 1600 ⇒ M = 4533.4 x − 0 − 4000 x − 2 − 1 1 x−5 + 2 x − 9 + 5866.6 x − 9 2 1 2 2 edaysar x = 9m ⇒ x − 9 = 0 ⇒ 1 x−9 = x−9 2 =0 ⇒ M = 4533.4 x − 4000 x − 2 − 800 x − 5 1 1 2 3> ]TahrN_GMBIkarkMNt;PaBdabrbs;Fñwm k> cUrsresrsmIkar y nig y' edayeRbIviFI GnuKmn_eTal 300N 1> rkRbtikmμTMr ∑ M A = 0 ⇒ 300 × 2 − 3 × RB = 0 A C B 2m 1m ⇒ RB = 200 N RA RB ∑ Y = 0 ⇒ R A + RB − 300 = 0 ⇒ R A = 100 N 2> smIkarm:Um:g; M = R A x − 0 − 300 x − 2 + RB x − 3 1 1 1 ⇒ M = 100 x − 300 x − 2 + 200 x − 3 1 1 1 3> smIkarDIepr:g;EsülénExSeGLasÞic X EIy" = − M = −100 x + 300 x − 2 − 200 x − 3 1 1 1 Y eFVIGaMgetRkalelIkTI1 eyIg)an EIy' = −50 x + 150 x − 2 − 100 x − 3 + C1 2 2 2 PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal 107
  • 3. T.Chhay eFVIGaMgetRkalelIkTI2 eyIg)an 50 3 100 EIy = − x + 50 x − 2 − x − 3 + C1 x + C2 3 3 3 3 rkefrGaMgetRkal C & C 1 2 Rtg;TMr A x =0⇒ y =0 ⇒ C2 = 0 Rtg;TMr B x =3⇒ y = 0 50 100 0 = − 33 + 50 3 − 2 − 3 − 3 + 3C1 + 0 3 3 3 3 ⇒ C1 = 133 CMnYstMél C & C eyIgTTYl)ansmIkarPaBdab nigmMurgVil 1 2 1 50 3 100 y= [− x + 50 x − 2 − x − 3 + 133x] 3 3 EI 3 3 1 y' = [−50 x + 150 x − 2 + 100 x − 3 + 133] 2 2 2 EI - sMrab;kMNat; AC : 0 < x < 2m 1 50 * y AC = (− x 3 + 133x) EI 3 1 * y ' AC = (−50 x 2 + 133) EI - sMrab;kMNat; CB : 2 < x < 3m 1 50 * yCB = [− x 3 + 50( x − 2) 3 + 133x] EI 3 1 * y 'CB = [−50 x 2 + 150( x − 2) 2 + 133] EI x> cUrsresrsmIkar y nig y' edayeRbIviFI GnuKmn_eTal 1> rkRbtikmμTMr 600N 400N/m ∑ M A = 0 ⇒ 400 × 3 × 2.5 − 6 × RD + 600 × 8 = 0 A D B C E ⇒ RD = 1300 N 1m 3m 2m 2m ∑ Y = 0 ⇒ R A + RD − 400 × 3 − 600 = 0 RA RD ⇒ R A = 500 N 2> smIkarm:Um:g; PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal 108
  • 4. T.Chhay 400 400 M = RA x − 0 − x −1 + x − 4 + RD x − 6 − 600 x − 8 1 2 2 1 1 2 2 ⇒ M = 500 x − 200 x − 1 + 200 x − 4 + 1300 x − 6 − 600 x − 8 1 2 2 1 1 3> smIkarDIepr:g;EsülénExSeGLasÞic X EIy" = − M = −500 x + 200 x − 1 − 200 x − 4 − 1300 x − 6 + 600 x − 8 1 2 2 1 1 Y eFVIGaMgetRkalelIkTI1 eyIg)an 200 200 EIy' = −250 x + x −1 − x − 4 − 650 x − 6 + 300 x − 8 + C1 2 3 3 2 2 3 3 eFVIGaMgetRkalelIkTI2 eyIg)an 250 3 200 200 650 EIy = − x + x −1 − x−4 − x − 6 + 100 x − 8 + C1 x + C2 4 4 3 3 3 12 12 3 rkefrGaMgetRkal C & C 1 2 Rtg;TMr A x =0⇒ y =0 ⇒ C2 = 0 Rtg;TMr D x =6⇒ y =0 250 3 200 200 650 0=− 6 + 6 −1 − 6−4 − 6 − 6 + 100 6 − 8 + 6C1 + 0 4 4 3 3 3 12 12 3 ⇒ C1 = 1308 CMnYstMél C & C eyIgTTYl)ansmIkarPaBdab nigmMurgVil 1 2 1 250 3 200 200 650 y= [− x + x −1 − x−4 − x − 6 + 100 x − 8 + 1308 x] 4 4 3 3 EI 3 12 3 3 1 200 200 y' = [−250 x + x −1 − x − 4 − 650 x − 6 + 300 x − 8 + 1308] 2 3 3 2 2 EI 3 3 rkPaBdabkNþalElVg eyIgCMnYs x = 3m eTAkñúgsmIkar y 1 250 3 200 200 650 y x =3 = [− 3 + 3 −1 − 3−4 − 3 − 6 + 100 3 − 8 + 1308 × 3] 4 4 3 3 EI 3 12 3 3 1 250 3 50 4 ⇒ y x=3 = [− 3 + 2 − 0 − 0 + 0 + 1308 × 3] EI 3 3 1941 ⇒ y x =3 = m EI rkPaBdabRtg;cMnuc E eyIgCMnYs x = 8m eTAkñúgsmIkar y PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal 109
  • 5. T.Chhay 1 250 3 200 200 650 y x=8 = [− 8 + 8 −1 − 8−4 − 8 − 6 + 100 8 − 8 + 1308 × 8] 4 4 3 3 EI 3 12 3 3 1 250 3 50 4 50 4 650 3 ⇒ y x=8 = [− 8 + 7 − 4 − 2 + 0 + 1308 × 8] EI 3 3 3 3 1814 ⇒ y x=8 = m EI PaBdabrbs;Fñwm edayviFIGnuKmn¾eTal 110