SLABS by suchenfz

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									     SLABS
     NOR AZMAR MIZAM ZAMHARI
            830421-13-6364
               AA 03037
   BACHELOR OF CIVIL ENGINEERING
UNIVERSITY COLLEGE OF ENGINEERING &
       TECHNOLOGY MALAYSIA
                 INTRODUCTION
    The floor construction of a dwelling must fulfill several criteria
    and the following design functions must be taken into
    consideration.
   The provision of a uniform, level surface
   Sufficient strength and stability
   Exclusion of dampness from inside of building
   Thermal insulation (max.0.45 W/square metre K)
   Resistance to fire
        DEFINITION OF SLABS
   Is a structure which is formed vertically to support
    it’s load and other similar type of load.
   The slab must be consolidate and stable to bear
    the “dead” and “life loads”.
   To ensure stability, the floor need sufficient
    vertical support to address the possible of
    limbering when it is loaded by a big loads.
THE FUNCTIONS OF SLABS
   To prepare a plane surface.
   To support loads.
   Operate as a sound, fire and heat insulator or
    resistance.
   As a ceiling to the beneath floor.
   The space between the floor and ceiling can be
    used to placed building equipment and materials.
    CHARACTERISTICS OF SLABS
 Must have long lasting endurance without
  any improvement or repairing
 Capable to withstand and resist on great
  fire for certain period
 Resistance to heat transmitting.
 Sound proof
        THE FAILURES OF SLABS
   Caused by the soil moisture below the
    floor:
       the moisture penetration from the underground to
        the floor surface depends on the soil features.
       the earth water level.
   The buildings basement condition whether
    it is plane or steep
EXAMPLES OF
  SLABS
Typical one-way beam grid and
 slab system. This parking
 structure has columns on a
 rectangular grid pattern. The
 essentially one-way design of
 the system can be seen by the
 relative lengths and sections
 of the main beam, and the
 primary and secondary beams
 under the slab. The
 rectangular shape of the
 unsupported slab also
 indicates one-way slab action
Typical waffle-slab for
parking structure. With
columns on a 33-ft x 27-ft
pattern, the design uses 3-
ft square waffles. Note the
infilling of the squares at
the head of the column to
resist both shear and
negative moments.
Waffle-slab roof, San Diego
Airport. Not heavily loaded as
a roof structure, the waffle
slab system could be
extended into the overhang
where the moments are
negative. Note also the
supporting columns with a
built-in point of zero moment
at two-thirds height. (San
Diego, California)
Typical flat slab
 construction for a parking
 structure. Note the
 square column capitals
 that increase the area of
 the slab resisting
 punching shear at the
 columns.
Typical flat plate constructiION. This
 office building under construction
 uses flat plates for the floors and
 constant section columns without
 capitals. The shear stiffness of the
 building is provided by elevator
 shafts and stair wells. Due to the
 relatively small floor loading and the
 close column spacing, flat plate
 construction was possible. For
 heavier loading and larger column
 spacing, column capitals are
 required (GoddenF73), and for even
 larger spans to reduce the self-
 weight, waffle slabs are used
 (GoddenF77)
TYPES OF THE
   SLABS
                 SOLID GROUND
   Benefits
       The cost is cheaper for plane area.
       Could reduce the construction of brick wall.
       Don’t need any air ventilation under the brick wall.
       Reduce the heat loss through the floor.
       Can avoid the risk of decay caused by dryness.
       Have varieties of floor finishing.
              HANGING SLAB
   Build as a wood platform which is elevate from the
    concrete surface layers.
   There’s a beneath under the floor that allow the
    air ventilation.
   The plank is install horizontally to the girder which
    is support by wall slab of half brick thickness.
   “void slab” is placed at the outside wall.
            UPPER FLOW
 construct by using wood or “konkrit
  bertulang”.
 the construction of basic floor from wood
 size gildger depends on the load that it
  support
SUSPENDED FLOOR
          All type of floors which
           is on the ground.
          Suspended slabs rest
           on the foundation wall.
          These are supported
           on the edges.
MONOLITHIC SLABS
           With Monolithic slabs,
            the footing and the
            slab are all one piece
            of concrete.
FLOATING SLABS
          With Floating slabs the
           foundation wall rests on a
           poured concrete footing.

          The slab is poured after
           the foundation has been
           completed.

								
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