Techno Press

Steel and Composite Structures   Volume 23, Number 4, March20 2017, pages 453-464
Connections between RC beam and square tubed-RC column under axial compression: Experiments
Xu-Hong Zhou, Bin-Yang Li, Dan Gan, Jie-Peng Liu and Y. Frank Chen

Abstract     [Full Text]
    The square tubed-reinforced concrete (TRC) column is a kind of special concrete-filled steel tube (CFST) columns, in which the outer thin-walled steel tube does not pass through the beam-column joint, so that the longitudinal steel reinforcing bars in the RC beam are continuous through the connection zone. However, there is a possible decrease of the axial bearing capacity at the TRC column to RC beam connection due to the discontinuity of the column tube, which is a concern to engineers. 24 connections and 7 square TRC columns were tested under axial compression. The primary parameters considered in the tests are: (1) connection location (corner, exterior and interior); (2) dimensions of RC beam cross section; (3) RC beam type (with or without horizontal haunches); (4) tube type (with or without stiffening ribs). The test results show that all specimens have relatively high load-carrying capacity and satisfactory ductility. With a proper design, the connections exhibit higher axial resistance and better ductility performance than the TRC column. The feasibility of this type of connections is verified.
Key Words
    square tubed-reinforced-concrete (TRC); concrete filled tube connections; horizontal haunched RC beam; failure pattern; axial compression behavior
(1) Xu-Hong Zhou, Bin-Yang Li, Dan Gan, Jie-Peng Liu:
Key Laboratory of New Technology for Construction of Cities in Mountain Area (Ministry of Education), Chongqing University, Chongqing 400045, China;
(2) Xu-Hong Zhou, Bin-Yang Li, Dan Gan, Jie-Peng Liu:
School of Civil Engineering, Chongqing University, Chongqing, 40045, China;
(3) Dan Gan:
School of Civil Engineering, Chang'an University, Xi'an 710061, China;
(4) Y. Frank Chen:
Department of Civil Engineering, The Pennsylvania State University, Middletown, PA 17057, USA.

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