Post Tensioned

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					                                             5/22/2009




     POST-TENSIONED SLAB



                     Mata Kuliah Prategang
                     Lanjut




Tipe Post-Tensioned Slab

 One-way Slab on Beams       Flat plate




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                                                   5/22/2009




Tipe Post-Tensioned Slab

  Slab w/ Wide Shallow   Slab w/ Column Capitals
         Beams               and Drop Panels




Tipe Post-Tensioned Slab

      Waffle Slab        Two-way Slab on Beams




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Tipe Tendon pada Post-Tensioned Slab

 Pelat lantai relatif tipis, shg penggunaan tipe
 ducting sangat berpengaruh pada
 eksentrisitas tendon.




Menentukan Tebal Pelat

 Faktor yang dipertimbangkan dalam
 menentukan tebal pelat
  –   Kontrol defleksi
  –   Tahanan geser
  –   Fire resistance
  –   Perlindungan tulangan terhadap karat




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Tabel Rasio Bentang-Tebal Pelat
Kontrol Defleksi

One-way slab                                        48
Two-way slab                                        45
Two-way slab with drop panel
(dipasang pada jarak maks. L/6 pada                 50
kedua arah)
Two-way slab with two-way beams                     55
Waffle (5 × 5 grid)                                 35
Beams (b ≈ h/3)                                     20
Beams (b ≈ 3h)                                      30




Tabel Tebal Pelat Minimum
Fire Resistance

                           Fire Endurance (jam)
Tipe Aggregat
                      1     1.5     2          3          4

Siliceous             89    108    127       159         178

Carbonate             83    105    117       146         168

Lightweight           67    83     95        117         133
                                   Tebal pelat minimum dalam mm




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Tebal Cover Beton Minimum untuk
Post-Tensioned Concrete Slabs

                                    Fire Endurance (jam)
Restraint       Tipe Agregat
                               1     1.5     2      3      4
              Siliceous        19     32    38     54      -

Unrestrained Carbonate         19     27    35     48      -

                g     g
              Lightweight      19     25    32     41      -

              Siliceous        19     19    19     25      32

 Restrained   Carbonate        19     19    19     25      32

              Lightweight      19     19    19     19      25




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