We may never know the real cause of this problem but it has been concluded that
high winds were also a factor in causing the “fatigue” that eventually sent a cable and
5,000-pound bracket crashing to the roadway surface.

Sources say there were four tie rods, two on each side, that held the
3-foot-wide steel crossbeam in place. Caltrans is replacing all four tie
rods, not just the two that fell off.
When a strong wind blows through the span, it causes structural components
that are exposed to oscillate. The entire bridge can be set vibrating, giving off a low-frequency hum.

Engineers said that while the original design compensated for those vibrations,
the Labor Day repair of the troubled eyebar did not.
The tie rods vibrated for seven weeks before a connection failed.
"What wasn't expected was the rod would shift in position relative to the other
metal components and the anchorages, during the vibration, it started to rub metal to metal.
That rubbing literally wore through the steel. Since the parts were under several
tons of tension, the failure was catastrophic.
"It looks like wind was a contributing factor to fatigue
on the tie rods, which caused vibration that made them collapse

__________________
"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….