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Prototype tests on beam-to-columnconnections with semi-rigid behaviourin precast concrete struct


Research on structural precast technology in Brazil

 


The most common beam-to-column connections in low rise building structures made of precast concrete constitutes elastomer cushioning and dowels. This connection typically behaves as a hinge, without the transfer of bending moments. This paper presents a study on variations of this connection; it incorporates two modifications which provide some rigidity to these bending moments. These modifications include: a) the substitution of an elastomer cushion by a cushion made of a cement-based material and b) the filling of the space between the beam and the column with grout. The cushion is manufactured using a cement-sand mortar with additions of soft aggregate, latex and short fibres, in order to obtain a cement-based material with greater deformability. These modifications do not change the practical way in which the connection is made. The proposed modifications aim to partially transfer bending moments, creating a semirigid behaviour at the connections. This paper presents the proposed modifications and the experimental results of two connection prototypes, one represents the internal column and the other represents an exterior column.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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