design of expansion joint for psc continuous type superstructure
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7/30/2019 Design of Expansion Joint for PSC continuous type superstructure
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Design of Expansion Joint for PSC continuous type superstructure
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LONGITUDINAL MOVEMENT AT END EXPANSION JOINT ON ABUTMENT :
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L = 70.000 m
Ec (M40 gr.) = 1.802 *106
t/m2
( deferred value has b
esh (at 28 days) = 1.90 *10-
ecr(at 28 days) = 4.00 *10-
/(t/m )
fb = 600 t/m2
(assumed)
a = 1.17 *10-5
/oC
T = +/- 25oC
esh*L
ush = fb*ecr*L = 13.3 mm
ucr= = 16.8 mm
------------------------a*T*L 30.1 mm
ut = = +/- 20.5 mm
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+ 50.6 mm
- 20.5 mm------------------------
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Therefore, provide El 40
with a movement of +/- mm with a preset for compression of15 mm.
AT INTERMEDIATE EXPANSION JOINT OVER PIER
The expansion joint gap at this location will twice the expansion gap at the ends.
Therefore, provide M 80
with a movement of +/- mm with a preset for compression of30 mm.
LEGEND:
L = effective length
Ec (M40 GR.) = design value of Modulus of Elasticity for M40 grade =570
ecr (at 7 days) = value of strain due to creep at 7 days
esh (at 7 days) = value of strain due to residual shrinkage at 7 daysecr (at 28 days) = value of strain due to creep at 28 days
esh (at 28 days) = value of strain due to residual shrinkage at 28 days
a = coefficient of expansion per degree centigrade
fb = bottom fibre stress
T = variation in temperature on the basis of extreme climate
ush = longitudinal deck movement due to effect of shrinkage
ut = longitudinal deck movement due to effect of temperature
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7/30/2019 Design of Expansion Joint for PSC continuous type superstructure
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ucr = longitudinal deck movement due to effect of temperature
ues = longitudinal deck movement due to effect of elastic short
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7/30/2019 Design of Expansion Joint for PSC continuous type superstructure
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en considered )
(fck) N/mm2
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7/30/2019 Design of Expansion Joint for PSC continuous type superstructure
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ning
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