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SECTION 9 PRESTRESSED CONCRETE Caltrans(第九部分预应力混凝土加州运输局)
BRIDGE DESIGN SPECIFICATIONS • APRIL 2000
SECTION 9 - PRESTRESSED CONCRETE
Part A
D = nominal diameter of prestressing steel (Articles
General Requirements and Materials
9.17 and 9.28) +
d = distance from extreme compressive fiber to cen
9.1 APPLICATION troid of the prestressing force, or to centroid of
negative moment reinforcing for precast girder
9.1.1 General bridges made continuous
dt = distance from the extreme compressive fiber to
The specifications of this section are intended for the centroid of the non-prestressed tension rein
design of prestressed concrete bridge members. Mem forcement (Articles 9.7 and 9.17-9.19)
bers designed as reinforced concrete, except for a per
ES = loss of prestress due to elastic shortening (Article
centage of tensile steel stressed to improve service behav
9.16)
ior, shall conform to the applicable specifications of
Section 8. e = base of Naperian logarithms (Article 9.16)
Exceptionally long span or unusual structures require f cds = average concrete compress
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