Abstract
This paper discusses RC interior step beam-column joints with headed anchor for beam longitudinal bars, developed to streamline the work of reinforcing for RC interior step joints. In general, beam longitudinal bars of step beam column joints are given a 90° hook in step beam-column joints. In RC buildings, step beam column joints are sometimes planned for architectural planning reasons. Nevertheless, interior step beam-column joints longitudinal bars are congested, and a 90° hook of the left and right beams may result in these hooks overlapping. In order to consider an interior step beam-column joints design method, four specimens with column-to-beam moment capacity ratio approximately 1.0 and 1.5 were tested. Regarding step beam-column joints, from the crack behavior, the stress transfer mechanism depends on positive and negative loading and is considered to consist of two struts which are formed by the balancing of the compressive forces concentrated at the ends of the column and beam and the balancing of the headed anchorage reaction forces. The stress transfer mechanism consisting of these two struts was modeled and proposed as a “double strut model.” A design method of RC interior step beam-column joints based on the double strut model is also proposed. It provides sufficient satisfaction as to the interior step beam-column joints experimental test results.
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