Pc- Reviewer

• ASTM A416M


  Strand
• ASTM A421M


  Wire
• ASTM A421M


  Low relaxation wire
• ASTM A722M


  High strength bar
• Loads shall include

  Self-weight

  Applied loads

  Effects of prestressing

  earthquakes

  Restraint of volume changes

  differential settlement
• reduction factor of bearing

  0.65
• reduction factor of shear

  0.75
• reduction factor of torsion

  0.75
• reduction factor of post tensioned anchorage zone

  0.85
• reduction factor of brackets and corbels

  0.75
• reduction factor of struts, ties, nodal zone

  0.75
• reduction factor of Components of connection of precast member controlled by yielding of steel elements in tension

  0.90
• reduction factor of plain concrete elements

  0.60
• reduction factor of anchors in concrete elements

  0.45 - 0.75
• Require strength U shall include internal load effects due to reactions induce by prestressing with a load factor of

  1
• For post tensioned anchorage zone design, design A load factor of 1.2 shall be applied to the maximum prestressing reinforcement jacking force
• U, T, C


  Prestress slab shall be classified as
• For slabs with bonded prestressed reinforcement total quantity of As and Aps shall be adequate to develop a factored load at least 1.2 times the cracking load calculated on the basis of fr as give.
• Eccentricity

  Between tendons and the concrete centroid
• Ln/3


  Length of deformed reinforcement in positive moment shall be at least
• ln/6


  Length of deformed reinforcement in each side of support shall be at least
• 1.8m


  distance between face of beam or wall to the nearest slab tendon shall not exceed to (blank)
• 1.4m


  If spacing of slab tendons exceeds (blank) additional deformed shrinkage and temperature reinforcement
• twice


  for slabs with both flexural and shear design strength at least (blank) the required strength
• C T


  for class -----and --- members, stresses at service load shall be calculated using the uncracked section
• C


  for class ----- members, stresses at service load shall be calculated using the cracked transformed section
• Act


  is the are of that part of the cross-section between the flexural tension face and the centroid of the gross section.
• 0.7 Mpa


  prestressed reinforcement to resist shrinkage and temperature stresses shall conform to the table and the effective prestress after losses shall provide and average compressive stress of at least ( blank) on gross concrete area
• 1860 MPa


  the maximum value of fpu permitted for design calculations A416M (strand)
• 1725 MPa


  the maximum value of fpu permitted for design calculations A421M (wire)
• 1035 MPa


  the maximum value of fpu permitted for design calculations A722M (high strength bar)
• flexural cracking


  bonded reinforcement shall be distributed to control _____ in tension zones of non-prestress and class C prestressed slabs and beams
• 250 Mpa


  the values of delta Fps shall not exceed to ___
• local and general


  anchorage regions of post-tensioned tendons shall consist of two zones
• Local zone


  shall be assumed to be a rectangular prism (equivalent rectangular prism for circular or oval anchorages) of concrete
• general zone


  includes the local zone and shall be assumed to be the portion of the member through which the concentrated prestressing force is transferred
• Special anchorage devices


  Are used, supplementary skin reinforcement shall be provided in addition to the confining reinforcement specified for the anchorage device
• Supplementary skin reinforcement


  Shall be similar in configuration and at least equivalent in volumetric ratio to any supplementary skin reinforcement used in the qualifying acceptance tests of the anchorage device.
• Methods shall be permitted for design of general zones


  Strut and tie models

  linear stress analysis

  simplified equations
• 1.5


  minimum edge distance is less than __ times the anchorage device lateral dimensions in that direction