PERFORMANCE OF EXTERIOR BEAM-COLUMN JOINTS UNDER SEISMIC TYPE LOADING

The objective of the present study is to compare the behaviour of exterior beam-column joint subassemblages with transverse reinforcements detailed as per IS 456 and IS 13920. A six-storeyed RC building in the zone III is analyzed, and one of the exterior beam-column joints at an intermediate storey is designed. The earthquake analysis and design are carried out by incorporating all the modifications as per the latest revisions of IS 1893 and IS 13920. Four one-third scaled specimens, two detailed as per IS 456 and SP 34 and the other two as per IS 13920, were tested under a reverse cyclic loading. The specimens were tested under two different axial loads to evaluate the effect of axial load on the behaviour of joints. The test results indicate that the latest revisions for joint design assure the beam failure to take place before the joint failure. Enhancements in the performance of beam-column joints detailed as per IS 13920 in the reversal of loading were also observed.