| Summary: | In this thesis, a double layer steel space truss was analyzed by using Probabilistic
Method with ANSYS program and validate by Finite Element Method with manual
calculation. This analysis is to determine the behaviors of the double layer steel space
truss. Besides that, it is also to study of the probabilistic response analysis and input
sensitivities of the double layer steel space truss. Nowadays space truss is widely used
in many types of construction that included stadium, shopping mall, tower, stage, roof
structure and also home design. The difference texture of assembly will definitely
beautify a building or a place. In this research structure a 4 x 4 x
0.5
meter for the length,
width and height had been used, there have 4 supports at the bottom of the structure,
and resist of a total of 16 point loads on the top of the structure. The circular hollow
cross section was used for the horizontal member and diagonal member for the structure.
A 275N/mm
2
of yield strength was choose for the steel space truss. The material and
geometry of the space truss was satisfying for this research since it passes all the design
criteria in designing for tensile, compression and also buckling. The ANSYS results
show very good agreement with manual calculation results. From the results of
simulation, we get to know the real behavior of the structure under the applied loads.
From probabilistic analysis, we got the results of cumulative distribution function,
histogram plot, sensitivity plot and simple history plot by 10000 times of simulation. In
the simulation results, 5
inputs were assigned to get the probabilistic maximum
deflection, axial stress and axial elastic strain. The
5
inputs are force, outer diameter of
horizontal member, outer diameter of diagonal member, thickness of horizontal member
and thickness of diagonal member. Results from ANSYS program indicated that the
maximum deflection is 7.74mm, maximum axial stress is 141.16MPa, and maximum
axial elastic strain is 0.6722E-03.
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