Title: EXPERIMENTAL STUDY OF CONNECTIONS COLUMN / STRESSED LIGHTENED SLAB.

Author(s): Eduardo Arellano Méndez, Óscar González Cuevas.

Publication: IMCYC

Volume: 3

Issue: 2

Appears on pages(s): 34-61

Keywords: Slabs, slab column connection, shear reinforcement, punching shear, posttensioned concrete.

DOI:

Date: 1/1/2012

Abstract:
In this work we present the experimental results from assays under cyclic loading of interior slab-column connections of a structural system consisting of lightweight post-tensioned slabs without beams. This system is being used in Mexico, with no experimental evidence to support the design methodologies employed. It was studied the connections at 1 to 1 in small prototypes. The edge and corner connections were not studied because in México generally post-tensioned slabs are placed in combination with a structure formed by beams perimeter seismic-resistant cambered and robust columns of concrete that help the stability of the connection. Five specimens were tested, one reinforced with stirrups and the other four bolts reinforced with shear connectors. A reversible cyclic test simulated the seismic behavior and was controlled by displacement. The failure was defined as the cycle in which the lateral force required a decrease of 20% compared to the maximum force registered. We conclude that, with some limitations discussed in the text, both braces are appropriate and can achieve displacements exceeding those provided for these structures in the Mexican Standards NTC-2004 for the design of concrete structures.