| Summary: | A storey building floor is usually made of a simple monolith system which needs
concrete formwork. One of alternative method is introduced to the public is using
the semi-precast system. In this system structure is divided into smaller panels to
make it possible to do without heavy equipment. Floor plate can be reduced
strength or rigid if the plate cracks or damage caused by the load acting on the
plate. The live load is always moving and recuring, it receives over the floor plate
having an affect on coherence between the panels with concrete cast in situ, it is
necessary to know the dynamic behavior of the semi-precast slab construction
with shear connector, that is needed dynamic testing.
In this study the dynamic testing using a vibrator machine that is put in the midspan.
This test consists of 4 pieces of the specimen plate panel, which consists of 2
monolith plates and 2 composite plate (semi precast), with a length of 3000 mm,
and the same height is 120 mm and a width of each 200 mm (Monolith Plate 200
and Composite Plate 200) and 400 mm (Monolith Plate 400 and Composite Plate
400). The specimen is supported on a beam width of 200 mm, height 420 mm and
length according to the width of the panel.
The results showed that monolith plate 200 (cast in situ plate) and composite
plates 200 (semi-precast slab) had the same natural frequency is 16.17 Hz, the
difference is 0% . While the monolith plate 400 (cast in situ plate) had a natural
frequency of 16.94 Hz and the composite plate 400 (semi-precast plate) had a
natural frequency of 15.87 Hz, there is a decrease in natural frequency of 6.32% .
Composite plate natural frequency decreased 1.86% with increasing the pane,
while the monolith plate increase 4.76%. The natural frequency of the system
structure damaged had a smaller natural frequency. The displacement mode
experimental results showed that plate damage had a larger displacement.
Curvature mode identification sufficient to show the damage. For the monolith
plate and the precast plate cracks pattern began in the mid-span and the
maximum load at failure crack pattern of flexural failure.
|
|---|