Who Broke The Bridge?

   / Who Broke The Bridge? #31  
This is going to make a very interesting case study...You can bet there are metallurgists all over chaffing at the bit to get some sample at the point of fracture...
As long as the bridge remains intact it should help expedite the investigation...

More findings of deteriorating infrastructure especially this type of issue with disaster prevented...nothing scarier than imagining going off a collapsing bridge...to get the electorate behind the infrastructure bills entering the process...
 
   / Who Broke The Bridge? #32  
s219 said:
Interesting failure. When a structural member breaks clean right near a major connection like that, it sort of suggests cyclical loading or vibration fatigue. The ability for the member to flex and relax is constrained when you get into short range of a connection.
Click to expand...
Many bridges of this era have problems with fatigue cracks in weld after millions of load cycles
 
   / Who Broke The Bridge? #33  
/pine said:
This is going to make a very interesting case study...You can bet there are metallurgists all over chaffing at the bit to get some sample at the point of fracture...
As long as the bridge remains intact it should help expedite the investigation...

More findings of deteriorating infrastructure especially this type of issue with disaster prevented...nothing scarier than imagining going off a collapsing bridge...to get the electorate behind the infrastructure bills entering the process...
Click to expand...
The material will be tested. Cracks in truss in Kentucky were found when material was harder than plan. Harder material cracked. This was in gusset plates at connections
 
   / Who Broke The Bridge? #36  
Streetcar said:
Longitudinal weld for length of member.
I have been the lead engineer for inspection of several bridges across Ohio river and numerous other bridges.
Cracks can grow from fraction of an inch to completely through member in hours.
Click to expand...
A failure like that has little or nothing to do with welds perpendicular to the failure.
 

Attachments

  • C0ADF440-72FA-4786-A06C-92CCBC891F0F.jpeg
    C0ADF440-72FA-4786-A06C-92CCBC891F0F.jpeg
    1.7 MB · Views: 118
   / Who Broke The Bridge?
  • Thread Starter
#37  
What bothers me is ... where there is one .... how many more? How many other members on that bridge are compromised in the same way? And how may other similar bridges?
 
   / Who Broke The Bridge? #38  
oosik said:
Right Arlyn - looks more like some type of stress fracture. The bridge is simply pulling apart. What type of construction method relies on rivets and not welds. I wonder - is this bridge old enough that welding was not available when it was constructed.
Click to expand...

Streetcar said:
Tied arch bridge not suspension
Bolted not riveted
Failure appears to be fatigue at weld
Beam looks to have minimal rust and section loss
Click to expand...
streetcar

the bolts are matched drilled with a matching plate on the inside streetcar you are correct I built bridges for mdot welds are too rigid.
 
   / Who Broke The Bridge? #39  
Diggin It said:
What bothers me is ... where there is one .... how many more? How many other members on that bridge are compromised in the same way? And how may other similar bridges?
Click to expand...
Ask the people in Mexico that tried to catch the subway train when the bridge broke.
 
   / Who Broke The Bridge? #40  
You must log in or register to reply here.
 

Footer Links 1

Top