Reduced stiffness as structure acceptance criteria on cyclical loading in castellated beams

Abstract

The performance of RBS (Reduced Beam Section) on the exterior connection structure of castellated beam-column with cyclic loading method was tested on three specimens, which were the steel castellated beam without RBS (WRBSC), castellated steel beam with the RBS-1 (RBSC-1), and castellated steel beams with the RBS-2 model (RBSC-2). The three specimens were designed in an assumption of the strong column-weak beam and other assumptions based on seismic regulations as a condition for earthquake resistant building planning. This study presents the results of each specimen when given a certain structural response. The results also provide a detailed description of the test results starting from lateral axial loads. The lateral force was assumed to be the most dominant force acting in this experimental test, while the gravitational force was considered insignificant. Thus, this test only obtained structural performance when alternating lateral forces (cyclic test) was applied to the column frame structure and castellated steel beams. The values of life safety (LS) for the three specimens were 2.1 while the CP (Collapse Prevention) values of WRBSC, RBSC-1, RBSC-2 reached 4.3, 4.1, and 3.6, respectively.