Abstract: A knot for connecting pillars and girders includes a first member adapted to be mounted on a pillar, and a plurality of second members which are each adapted to be connected to a respective girder. The number of second members is equal to the number of girders to be coupled with the pillar. The first member is made up of an upper plate and a lower plate that are coaxial and vertically spaced with respect to each other. These plates each have a number of sides equal to the number of the girders that converge onto the knot. The first member has a first coupling. The lower and upper plates are vertically coupled to each other by joining tongues which have second couplings. The second member has first and second horizontal plates which are vertically spaced from each other, and these plates are provided with a third coupling that couples with the first coupling of the first member. The first and second plates are joined by a transverse vertical plate and a longitudinal vertical plate.