Performance Of Mixed Ordinary And
High Strength Steel Reinforced Concrete Frames
Author(s)
A. U. Qazi, L. Ye & X. Lu
Abstract
Earthquakes are still claiming lives despite the advancements in earthquake
resistance techniques and structural design methodologies. Formations of
collapse mechanisms under strong ground motions are not uncommon in RC
frames. Failure mechanisms in ordinary RC frames are believed to be prevented
by adopting the strong column weak beam philosophy. However, limited flexural
strength and lateral deformation capacity of the ordinary steel reinforced
columns often results in the incipient of the failure mechanisms. Large
inelasticity at the column bases poses serious problems and global stability of the
structure is endangered. Furthermore large residual displacements at the end of a
dynamic event cannot be ruled out. A numerical study on the performance of
frames reinforced with the mixed high strength and ordinary reinforcements in
the columns revealed steadier performance as compared to ordinary RC frames.
The moderate rise frame, a mixed ordinary and high strength steel reinforced
concrete frame (MRC), showed more lateral strength as compared with the
ordinary RC frame. Failure mechanisms in the moderate rise MRC frame are
almost prevented or delayed as compared with the ordinary RC frame. In the
relatively high rise MRC frame, a less obvious increase in lateral strength in
comparison with the ordinary RC frame is observed. However, greater
deformation capacity and a delay in the formation of the collapse mechanism are
observed in the high rise MRC frame. Residual displacements are also
minimized in the MRC frame as compared to the ordinary RC frame. It is
envisaged that steady performance of the MRC frame can give a more stable
response during earthquakes.
Keywords: earthquake, failure mechanisms, residual displacements, mixed
reinforcements, steady response.
Keywords
earthquake, failure mechanisms, residual displacements, mixed
reinforcements, steady response.
Related Book
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