strong column weak beam concept
REINFORCED CONCRETE BEAM-COLUMN
CONNECTIONS SUBJECTED TO SEISMIC LATERAL LOADING
Reinforced concrete moment
resisting frames (RCMRF) are structural systems designed to ensure proper
energy dissipation capacity and lateral stability when subjected to seismic lateral loading. In this design
philosophy, the so-called “strong-column / weak-beam” concept is recommended
and elastic behavior of the joints and columns of RCMRF is desirable.
Beam-column connections have been identified as potentially one of the weaker
components when RCMRF is subjected to seismic lateral loading. Since the
mid-1960s, numerous experimental tests and analytical studies have been
conducted to investigate the performance of reinforced concrete (RC)
beam-column connections subjected to lateral earthquake loading. When only the
flexural strength of well-detailed longitudinal beams limits overall response,
RC beam-column connections typically display ductile behavior (with the joint
panel region essentially remaining elastic). The failure mode wherein the beams
form hinges is usually considered to be the most desirable for maintaining good
global energy-dissipation without severe degradation of capacity at the
connections. On the other hand, RC beam-column connections can exhibit less
robust behavior when severe damage is concentrated within the joint panel. Therefore,
understanding joint shear behavior is important toward controlling the overall performance
of RC beam-column connections and frames.
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