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X4
Category 4: Special Projects
Shoring Structure for a Cement Transportation System - Nordeste, Brazil
Characterisation
In this project an exceptional structure was used:
a 40-m-high tubular tower, 48 mm diameter posts,
diagonals and bars, stiffened by spatial tubular trusses
with the diameter of 48 mm coupled with the towers
by braces; composed of eight stayed cables with the
diameter of 12.7 mm.
Modelling technique and analysis
For the first phase of the analysis, a model of the
transporter structure was made using finite elements of
bars and plates simulating the frames of the steel and
carrier base. The model was loaded with self-weight,
wind and live load, and then submitted to a linear static
analysis. The support of the first structure was defined
between this structure and adjacent steel columns - the
support could be changed if necessary, depending
on the transporter maintenance needs, as well as the
beam support that makes the transition between the
transporter and the shoring towers.
The reactions of this first model were then transferred to
a second numerical model that simulated the behaviour
of the shoring structure, composed of tubular towers,
frames and stayed cables. This model was loaded with
self-weight and wind. The geometric imperfections
derived from the assembly phase were considered on
the model according to the national standard code.
The second numerical model was submitted to a static
analysis, geometric non-linear, using the Newton-
Raphson method for the solution to the equations.
About Scia Engineer
Scia Engineer was the best solution found to attend
to our focus: scaffolding structures connected with
infrastructure and industrial projects. The main benefit
was accurate results and fast and easy modelling.
Scia Engineer ensured a new level of quality and
precision of scaffolding projects, which allowed for
efficient and cheaper projects.
References:
NBR 15696 - Formas e escoramentos para estruturas
de concreto; ABNT.
NBR 6123 - Forças devido ao vento em edificações;
ABNT.
NBR 8800 - Projeto de estrutura de aço e de estrutura
mista de aço e concreto de edifícios; ABNT.
NBR 14762 - Dimensionamento de estruturas
constituídas por perfis formados a frio; ABNT.
ESTUB NE12/142; Projeto de montagem; autores:
Ronaldo Cisneiros e Josemar Carlos; Estub Sistemas
Construtivos, filial Recife.
Análise Numérica e Experimental da Estabilidade
de Torres Tubulares de Escoramentos; Dissertação
de mestrado; autor: Celuos Alves; Estub Sistemas
Construtivos Ltda, filial Rio de Janeiro.
Software: Scia Engineer
