Title: Performance of precast concrete moment frames subjected to column removal: Part 1, experimental study
Date Published: September-October 2017
Volume: 62
Issue: 5 
Page Numbers: 35-52
Authors: H. S. Lew, Joseph A. Main, Yihai Bao, Fahim Sadek, Vincent P. Chiarito, Stephen D. Robert, and Jorge O. Torres
https://doi.org/10.15554/pcij62.5-02

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Abstract

This paper presents a full-scale experimental study of two precast concrete moment-frame assemblies, each comprising three columns and two beams. The assemblies represented portions of seismically designed perimeter moment frames from two 10-story prototype buildings. One assembly was part of an ordinary moment frame, and the other was part of a special moment frame. The assemblies were subjected to monotonically increasing vertical displacement of the unsupported center column to observe their behavior and failure modes under simulated column removal.

The failures of both the ordinary moment frame and special moment frame specimens were characterized by fracture of the bottom anchorage bars at the welded connection to the center column and diagonal cracking and shear deformation of the end columns under outward forces generated by arching action in the beams.

Additional failure modes included shear stud failure for the ordinary moment frame specimen and bond failure of anchorage bars for the special moment frame specimen.

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