TERMINOLOGIES - MIDTERM Flashcards
in post-tensioned members, the hardware used to transfer force from prestressed resaforcement to the concrete,
ANCHORAGE DEVICE
is an anchorage device used with any single strand or a single 16mm, or smaller diameter bar
ANCHORAGE DEVICE, BASIC MONOSTRAND
is an anchorage device used with multiple strands, bars, or wires, or with single bars larger than 16 mm diameters
ANCHORAGE DEVICE, BASIC MULTISTRAND
is a steel element either cast into concrete or post-installed into a hardened concrete member and used to transmit applied loads to the concrete.
ANCHOR
is a headed bolt, headed stud, or hooked bolt (J- or L-bolt) installed before placing concrete.
ANCHOR, CAST-IN
is a cast-in steel anchor that develops its tensile strength from the mechanical interlock provided by either a head or nut at the embedded and of the anchor
ANCHOR, HEADED BOLT
is an anchorage device that satisfies tests required in Section 425.9.3.1c.
ANCHORAGE DEVICE, SPECIAL
in post-tensioned members, portion of the member through which the concentrated prestressing force is transferred to the concrete and distributed more uniformly across the section; its extent is equal to the largest dimension of the cross section; for anchorage devices located away from the end of a member, the anchorage zone includes the disturbed regions ahead of and behind the anchorage device.
ANCHORAGE ZONE
is a concrete in which internal stresses have been introduced to reduce potential tensile stresses in concrete resulting from service loads.
CONCRETE, PRESTRESSED
is a conduit, plain or corrugated, to accommodate prestressing reinforcement for post-tensioning applications.
DUCT
is an ability of a structure or member to resist deterioration that impairs performance or limits service life of the structure in the relevant environment considered in design.
DURABILITY
is a distance measured from extreme compression fiber to centroid of Tension reinforcement
EFFECTIVE DEPTH OF SECTION
is a stress remaining in prestressing reinforcement after all losses in have occurred
EFFECTIVE PRESTRESS
is a method of prestressing in which prestressing reinforcement is tensioned after concrete has hardened.
POST-TENSIONING
is a portion of a prestressed member where flexural tension, calculated using gross section properties, would occur under service louds if the prestress force was not present.
PRECOMPRESSED TENSILE ZONE
is a method of prestressing in which prestressing reinforcement is tensioned before concrete is cast.
PRETENSIONING
is prestressing reinforcement that has been tensioned to impart forces to concrete.
REINFORCEMENT PRESTRESSED
is a pretensioned reinforcement or prestressed reinforcement in a bonded tendon.
REINFORCEMENT, BONDED PRESTRESSED
is a high- strength reinforcement such as strand, wire, or bar
REINFORCEMENT, PRESTRESSING
Anchorages and couplers for tendons shall develop at least _____________ when tested in an unbonded condition, without exceeding anticipated ser.
95 percent of fpu
Anchorages and couplers for bonded tendons shall be located so that ____________ shall be developed at critical sections after the post-tensioned reinforcement is bonded in the member.
100 percent of fpu
T or F
Mono strand or single 16 mm or smaller diameter bar anchorage devices shall meet the bearing resistanc and local zone requirements of ACT 423.7;
T
Strength Reduction Factor for Post-tensioned anchorage zones
0.85
Strength Reduction Factor for Anchors in concrete Elements
0.45 to 0.75
