Lecture 4 - Conjugate Beam
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Transcript of Lecture 4 - Conjugate Beam
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8/13/2019 Lecture 4 - Conjugate Beam
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Last Time e ec on agrams as c urve
ASSUMPTIONLinear Elastic Material Response
undeformed position after load is removed
OBJECTIVECalculate Slope and De lection due to
Bending at any point on a BeamMETHODS
• Double Integration Method• Moment Area Theorems
• Conjugate Beam
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as me - ou e n egra on e o
Relate Moments to Deflections
M yd 2
EI dx=
2
xdyIntegration Constants
== x x EI dx
x)( Use Boundary Conditions
to Evaluate Integration
= dxdx x EI x y )()(onstants
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Developed by H. Muller Breslau - 1865
se to in s opes an e ection ue to
bending of beams
Method is based on
Principles of Statics Only
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Internal Loadings Beam Theory
w
dx
dV =
EI dx
d =
θ
wdV M d
==2
M d ud ==
θ 2
dxdx EI dxdx 2
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Internal Loadings Beam Theory
∫= dxwV ∫ ⎟ ⎠
⎜⎝
= dx EI
θ
∫ ∫= dxdxw M dxdx EI M
u ∫ ∫ ⎥⎤
⎢⎡
⎟ ⎞
⎜⎛
=
Let EI
w =
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A “fictitious” beam of the same length as the real beam loaded with the realbeam’s M/EI diagram…
θReal Beam
= VConjugate Beam
Real Beam Conjugate Beam
...
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Shear and Moment at Supports of Conjugate Beam shouldaccount for the corresponding slope and deflection of real
beam at its su orts
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8/13/2019 Lecture 4 - Conjugate Beam
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Shear and Moment at Supports of Conjugate Beam shouldaccount for the corresponding slope and deflection of real
beam at its su orts
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8/13/2019 Lecture 4 - Conjugate Beam
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Shear and Moment at Supports of Conjugate Beam shouldaccount for the corresponding slope and deflection of real
beam at its su orts
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xamp es o on uga e eam uppor s
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8/13/2019 Lecture 4 - Conjugate Beam
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xamp es o on uga e eam uppor s
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xamp es o on uga e eam uppor s
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8/13/2019 Lecture 4 - Conjugate Beam
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xamp es o on uga e eam uppor s
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ang a - ang a eri ut ini apat iguna an untu menentu anputaran sudut dan lendutan dari suatu balok dengan menggunakanme o a a o con uga e.
Gambarkan diagram M/EI dari balok asli sesuai dengan pem e anan yang ter a pa a a o as terse ut.
Tentukan balok conjugate sesuai dengan balok asli dan tentukan
tumpuan dan sendi dalam dari balok conjugate tersebutsehingga geser dan momen yang terjadi pada balok conjugateons sten engan putaran su ut an e e s yang ter a pa a
balok asli.
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e ani a o conjugate engan iagram ari a o as i.Ordinat positip dari diagram M/EI diberlakukan sebagaie an engan ara ea as.
Hitung reaksi-reaksi perletakan pada balok conjugate denganmengguna an persamaan ese m angan.
Hitung geser yang terjadi pada balok conjugate pada suatu
titik dimana kita ingin mengetahui putaran sudut yang terjadipada balok asli. Demikian pula, hitung momen lentur yangter a pa a a o con ugate pa a suatu t t mana ta ng nmengetahui lendutan yang terjadi pada balok asli.