Evaluación de conexiones madera a madera atornilladas y clavadas sometidas a carga lateral para la adaptación de la metodología del NDS a la Norma Sismo Resistente colombiana – NSR

Abstract

Wood is a construction material with variable physical and mechanical properties; therefore, it requires special treatment to enhance its structural benefits. Frequently, the stability and serviceability of timber structures are governed by the connections between elements, creating the need for improved standards and practices of design for mechanical connections. This analysis aims to assess the accuracy of the methodology proposed in the National Design Specification (NDS) through experimental tests of double-screwed and nailed connections with Acacia mangium Willd. lumber subjected to single shear. The dowel fasteners configuration for the experimental program was designed to support a load of 1.0 tons. The capacity and yield modes were evaluated, regarding the anhydrous and basic density of the wood elements, using the methodology established in the NDS-18 and the NSR-10. Ten (10) experimental tests were performed for each dowel fastener configuration. The force vs. displacement curve was obtained for each test. Row-shear failure was observed in the nailed joints, while bearing failure was observed in the screwed joints. Important differences were found between the type of joints, experimental values, and reference values. The design values were more conservative calculated with the minimum and local mean basic density. The experimental results are expected to be a reference for the NSR-10 update.