JOURNAL OF EARTHQUAKE ENGINEERING, v.16, no.2, pp.211 - 230
Abstract
Given the overly strict requirements for clear headed-bar spacing in ACI 318-08 and the lack of headed bar provisions in CEB-FIB MC 90, two approximately 2/3-scale exterior beam-column connection subassemblies were tested under cyclic lateral loading. The tests primarily explored the effect on their seismic performance of using (a) small clear spacings and (b) multiple layers of headed bars in the beam. Also, previous test data were thoroughly analyzed. It was concluded that the clear bar spacing of approximately 2d(b) or the use of two bar layers may be permitted for headed bars anchored in exterior beam-column joints.