Levantamento técnico econômico de uma treliça de madeira na Região Metropolitana do Recife - PE

Abstract

Wood is a material suitable for use in structures due to its properties and reduced energy needed to prepare them. The truss system is the most used for roofs and bridges, presenting lower cost and agility in execution without impairing efficiency structure. The use of prefabricated wood pieces is a resolutive option in civil construction, is essential for sustainable development, and is a more economical system. Therefore, this study aims to carry out a technical and economic survey of a company having as its main product the truss according to the norms NBR 7190 (1997), providing the optimization of the use of maçaranduba wood and mixed wood from the timber market in the metropolitan region of Recife - PE. Samples of maçaranduba wood and those called as mixed were collected at the local market in the city of Recife-PE. Each wood had its moisture content and apparent density calculated to classify its resistance, according to NBR 7190 (1997). The gable Howe trusses' design was taken into account, using the local market as a basis for determining the sections of the parts and subsequent budget, including labor per production step. After calculations, the amount of wood volume required for the roof structure was obtained, and due to their lower resistance, mixed wood structures require a larger volume of wood. Regarding the economic survey, based on the local market, the mixed wood structure obtained a production cost of 5,5% more than that of maçaranduba, despite the lower cost of the sawn wood unit, due to the higher volume of wood needed and connecting elements. Finally, due to the lack of a significant number of companies operating in the sector, the scenario for the prefabricated market in the region is favorable for entrepreneurs looking for a market with good development chances.