EXPERIMENTAL STUDY OF RC ASSEMBLIES UNDER A COLUMN REMOVAL SCENARIO
Hai S. Lew, Yihai Bao, Santiago Pujol, Mete Sozen
This paper presents an experimental study of two full-scale reinforced concrete (R/C) beam-column assemblies under a column removal scenario. The assemblies represent portions of the exterior moment-resisting frames of two ten-story R/C frame buildings, one designed for Seismic Design Category C (SDC C) and the other for SDC D. Intermediate moment frames (IMFs) and special moment frames (SMFs) are used in the SDC C and SDC D designs, respectively. The assemblies were subjected to monotonically increasing vertical displacement of the center column. With increased vertical displacement, three stages of structural behavior are evident. The test results show that the ultimate loads under the column removal scenario are primarily resisted through catenary action. The tensile force increase is limited by the fracture strength of the tensile reinforcement of the beams. The rotational capacities under monotonic column displacement are seven to eight times as large as those in ASCE 41, which are based on seismic test data.