Title: Controversial Issues in the Seismic Design of Connections in Reinforced Concrete Frames
Author(s): D. Mitchell
Publication: Symposium Paper
Appears on pages(s): 75-96
Keywords: beams (supports); earthquake-resistant structures; slabs; joints (junctions); frames; reinforced concrete; structural design; Design
Discusses aspects of the design of connections in reinforced concrete frame structures which often get overlooked. The need for careful assessment and detailing of slab-column connections in flat plate structures combined with walls is addressed. The way in which the strength and stiffness of spandrel beams can significantly alter the expected response of beam-column connections is illustrated by experimental results and observed seismic damage. Detailed analysis of beam-column joint regions using the modified compression field theory demonstrates behavioral features that have important design implications. The use of nonlinear finite element modelling of joint regions to design efficient, yet practical, retrofit measures is discussed. An alternate form of construction using ductile steel link beams to connect reinforced concrete walls is presented. The important design features for the connection of these beams to the walls are highlighted.