| Summary: | Hollow spherical concrete slab has been one of alternative technology
aimed to reduce the self-weight and save concrete material. The plastic ball
placement on concrete tension area should not to reduce flexural strength. The
non linear concrete material and the presence of plastic balls inside the slab lead
to the necessity of numerical solution approach using ATENA software.
This research deals with flexural behavior of 12 cm-thick-solid slab (PL1)
and two hollow sphere slabs with thickness of 12 cm (PL2) and 14.3 cm (PL3),
which are casted onsite, employing non linear finite element method. The test
setting and specimen data refer to previous experimental research by Soeharno
(2009). Two-point static load testing was applied to the specimen and given by a
hydraulic jack. Research parameter study observed the effect of slab void ratio on
its flexural behavior. Numerical analysis was performed using ATENA software
and supported by GID as the graphical user interface. The observed behaviors on
this research are strength, stiffness, ductility, and crack pattern.
The determination of numerical modeling element affects the analysis
result. The comparison of element type indicates that flexural strength of
hexahedral solid slab (PL1_NumLH) is closer to experimental result (PL1_EKS)
than that of tetrahedral solid slab (PL1_NumLT). This research shows that
flexural strength of numerical calculation of PL1_NUM, PL2_NUM, PL3_NUM,
are respectively 54 kN, 53 kN, and 67 kN. Whereas, the flexural strength obtained
by experiments of PL1_EKS, PL2_EKS, PL3_EKS, are respectively 43.29 kN,
46.29 kN, and 68.29 kN. Such flexural strength differences occur because of the
ideal condition of numerical modeling. Flexural strength, stiffness, and ductility
of PL2_NUM (PB19) decrease as the slab void ratio increases.
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