Comments by "Biały" (@Bialy_1) on "jeffostroff"
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@RobBCactive You clearly have zero understanding of the topic... even on the most basic level so why you trying to draw any conclusions?
"isn't the function of rebar to give tensile strength" usually in basic applications this is its main function.
but not in such a column, such a tall building.
The bars in this case had a lot of work with compression, in places where the column connects with horizontal elements the bars will mainly counteract shear forces.
and in the middle of horizontal beams again the most important function will be tension, however if the slenderness of the element counts then in this case too you can add steel to increase shear strength without having to increase the beam's dimensions.
During an earthquake, forces change from static to dynamic forces. Not only can this cause a reversal of the direction of the forces(to oposite in some areas), but it is generally accepted that elements under dynamic loading can withstand 1/3 of what they can with static load (in the sense that these are the parameters used in design).
It's hard to say what the Chinese were thinking, they clearly weren't thinking about safety, only about maximizing profits. It's also very likely that the decision-makers at the top didn't know anything about construction at all, and their only skills were connections in the communist party and the ability to give bribes.
Considering how the building fell apart, you can bet money that there were a lot of deviations from the standards, in many places and of various types...
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