test your brain
test your brain
(OP)
Are plastic hinges designed in columns, in girders or in both?
Which is more likely to have a smaller natural frequ of vibration, a steel moment-resisting frame or a concrete moment resisting frame, given equal heights and moment of interia?
Which is more likely to have a larger damping ratio, a steel or concrete moment resisting frame?
Which is more likely to have a smaller natural frequ of vibration, a steel moment-resisting frame or a concrete moment resisting frame, given equal heights and moment of interia?
Which is more likely to have a larger damping ratio, a steel or concrete moment resisting frame?






RE: test your brain
A collapse mechanism can have hinges in both columns and girders at different nodes.
The concrete will have a lower frequency due to the reduced Modulus of Elasticity as well as the internal damping.
The concrete frame due to cracking will have a greater internal damping.
I'll let Ron correct these <G>...
RE: test your brain
RE: test your brain
Regarding the increased mass... might just slow it down a tad...
RE: test your brain
dik is on target as usual.
His priorities are correct as well....always kick at the cat first.