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إنشاء معماريالخرسانة سابقة الاجهاد
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== <
. 1928 .
1939
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: . 1928 .
. 1939 .
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. .
(Partial Prestressing Concrete) . ( ) (DL; LL) ( 1). : 1- (Pre-tensioned) ( (Prestressed steel) ( . ( 2). ( 220/2) (Bond). 2- (Post -tensioned) . (Ducts) ( 250/2) ( 3). (Shear strength) (Continuos elements). (Bonded Tendons) (Unbonded Tendons). (Hydraulic jacks) . (Expanded cement) (Self prestressing) 3-4% . . (Full prestressing) (DL+LL) (Modulus of rupture) ( 4). (Partial prestressing) ( 5) (). (Partial prestressing) (deflection) . (Ductility) (Dynamic and repeated loading). ( )
1. : . ( ) . .
2. :
. . .
3. :
4. : . .
tendon
pre tension concrete strand Grider
Pre Tension concrete slab hollow core slab
Pre tension hollow core slab
Ponded post tension slab
duct
Unponded post tenstion slab
strand PVC
Post Tension Slab =PST Punshing shear shear studs
Steel Shear Studs Punshing shear
1. 2. .3. .4. .5. .6. .7. .
:
1-- : 60-75 . 2-- : .3-- : 12-18 .
:
1-- 2-- .3-- 4-- .5-- .6-- .7--
. . ( ) . . : unbonded .
.
. . . . . lintels. . . ( ). . . . ( ) . . ( ) . . falsework . unbonded :1. destress .2. '' .3. .4. / .
. ( ) . . destress ( ). :1. ( : 4 2 ).2. .3. . () ( ) . . . . . . . . . . . . 1. 2. 3. 4. 5. 8. 9. 10. Post-Tensioning-Cables-13.jpg11. 12. formwork
. Unbonded . [3] . ( ) . floorspace . . 1951. . .
grc
grc 30 . grc .
grc:
1- .2- .3- .4- .5- .6- grc 612 .7- .8- grc .9- 10-
:
()