Abstract
Abstract In this paper, an experimental investigation is presented on semi-rigid interior beam-to-column connections constituted by precast concrete beams supported on precast concrete column corbels and bending continuity reinforcement bars for bending negative moments. The main purpose of this paper was to analyze the influence of vertical interface grout filling between the corbel and the beam and the position of the bending continuity reinforcement bars (crossing only the column or crossing only the slab) on the behavior of this type of connection. Tests on eight specimens were performed. It was noticed that the vertical interface grout filling contributed to increase both rotational flexural stiffness and flexural strength capacity of the connections when compared to the connections without grout filling. It was also noticed that in the specimens in which the continuity bars crossed only the column, the rotational flexural stiffness was higher. For these last ones, coefficients k and β for predicting the secant stiffness by simplified expression present in Brazilian Code NBR 9062 were evaluate from experimental results. These evaluated coefficients may be regarded as indicative values for structural designers and helpful for future researches.
Highlights
The study of the connections between precast concrete structural members is of great importance for the development and execution of design, since the performance of the precast concrete structural system is directly related to the performance of their connections, affecting both the local behavior of the adjacent members and the global behavior of the structure
An experimental investigation is presented on semi-rigid interior beam-to-column connections constituted by precast concrete beams supported on precast concrete column corbels and bending continuity reinforcement bars for bending negative moments
It was noticed that the vertical interface grout filling contributed to increase both rotational flexural stiffness and flexural strength capacity of the connections when compared to the connections without grout filling
Summary
The study of the connections between precast concrete structural members is of great importance for the development and execution of design, since the performance of the precast concrete structural system is directly related to the performance of their connections, affecting both the local behavior of the adjacent members and the global behavior of the structure. The types of investigated beam-column connections are designed for negative bending moments and are composed of continuity reinforcement, precast beam supported by precast column corbel and fixed by steel dowels and grout filling at the beam and column interface. The main goal of Lacerda [26] was to evaluate the behavior of the connections under the influence of the filling the lower interface between the beam and the corbel (with or without grout) and the influence of the position of the continuity reinforcement (crossing only the column or only the slab). As an additional contribution of this paper, it were obtained (for two types of connection) the coefficients k and e β present in the simplified expression of NBR 9062 [27] for the prediction of the secant stiffness, from the experimental results obtained by Lacerda [26]
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