228 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 NewtonRaphson 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
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