Abstract
Practical use of secondary walls such as sidewalls is common because the contributions of secondary walls for stiffness or strength have been recognized. In 2016, “AIJ Standard for Lateral Load-carrying Capacity Calculation of Reinforced Concrete Structures” was published as a draft by Architectural Institute of Japan. In this standard new equations for columns with side walls were proposed. From this viewpoint, the authors have conducted static loading tests of flexurally controlled RC column specimens with single opening in the sidewall, to investigate the effects of openings on strength and deformation capacity of RC columns with a side walls. In this paper, the limitations on location of openings inside sidewalls to avoid their effects on flexural strength and deformation capacity are examined using design equations for flexural strength based on full plastic moment of the column and sidewall. The test results indicate that the proposed limitation line on location of openings to avoid their effects for flexure could be effective for practical design.
Highlights
Practical use of secondary walls such as sidewalls is expected in building construction in Japan because contributions of secondary walls for stiffness or strength have been recognized
Experimental studies had been reported in Refs. [3,4,5] using reinforced concrete columns with a perforated sidewall failing in flexure to examine the effects of openings on flexural strength and deformation capacity of columns with sidewalls
If the value of 0.06 as εcu for confined specimens is assumed test results indicated that specimens FU and F-100U were found to show the same performance as the unperforated specimens
Summary
Practical use of secondary walls such as sidewalls is expected in building construction in Japan because contributions of secondary walls for stiffness or strength have been recognized. Suitable design equations for secondary walls had not been provided From this view point some studies were conducted and as a result of these studies new equations for columns with side walls were proposed in “AIJ Standard for Lateral Load-carrying Capacity Calculation of Reinforced Concrete Structures” published as a draft by Architectural Institute of Japan in 2016 [1]. Small openings are popularly set up on sidewalls for the purpose of plumbing, heating, electric installations, etc From this view point authors have conducted static loading tests of RC column specimens with a perforated side wall failing in shear and examined effects of openings on shear strength [2]. In other words the locations of openings were examined so that perforated sidewalls demonstrated the same flexural performance as unperforated sidewalls
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