Performance of Steel Moment Connections under a Column Removal Scenario. I: Experiments

TLDR

The assemblies represent portions of the exterior moment‑resisting frames of two 10‑story steel‑frame buildings. This paper presents an experimental study of two full‑scale steel beam‑column assemblies to define their response under a column‑removal scenario and to provide data for validating beam‑to‑column connection models. One specimen had welded unreinforced flange, bolted web connections, while the other had reduced beam‑section connections. Under monotonic column displacement, both specimens first behaved elastically with flexure, then yielded and developed axial tension in the beams that rose until the connections failed under combined bending and axial stresses, and the measured rotational capacities were roughly twice those predicted by seismic‑test data.

Abstract

This paper presents an experimental study of two full-scale steel beam-column assemblies, each comprising three columns and two beams, to (1) define their response characteristics under a column-removal scenario, including the capacity of the beams and their connections to carry loads through catenary action, and (2) provide experimental data for validation of beam-to-column connection models for assessing the robustness of structural systems. The assemblies represent portions of the exterior moment-resisting frames of two 10-story steel-frame buildings. One test specimen had welded unreinforced flange, bolted web connections, and the other had reduced beam–section connections. When subjected to monotonically increasing vertical displacement of the unsupported center column, both specimens exhibited an initial elastic response dominated by flexure. With increased vertical displacement, the connections yielded, and axial tension developed in the beams. The axial tension in the beams increased until the connections failed under combined bending and axial stresses. The test results show that the rotational capacities of both connections under monotonic column displacement are about twice as large as those based on seismic-test data.