Modelado computacional y experimental del efecto de la precarga de los tornillos en la falla de uniones atornilladas a cortante doble de láminas fabricadas en acero a36.

Abstract

The present project has to determine the effect of the preload in double shear joint with one, two and three bolts submitted to tension. To give fulfillment to the objective, experimental and computational models were prepared. Its development was executed of the following way, in the first stage, tension test realized at the universal machine from Santo Tomas University in order to obtain the stress strain real curve, being useful to determine the inherent mechanical properties of steel A36 used in the manufacture of double shear joint. As the second stage, the double shear joint with preload of 0%, 75% and 90% were subjected to tension test followed the experimental design. As third stage, validating the results of limit load calculated with the equations present at the standard Norma Sismo Resistente Colombiana (NSR10) and the specification ANSI/AISC 360-10. The fourth stage represents the achievement of the computational models with bilinear and multilineal behavior, case of nonlinear contact, friction and effect of preload were the most critical variables. Its respective results were compared with the experimental results in order to validate that the model of finite elements was satisfactory. Finally it conclude that the specification ANSI/AISC 360-10 Method of the LRFD has the correct equation that predicts the limit load for each of the double shear joint and that the computational multilineal model is more accurate than bilinear model .