Influence of Major Beam Damage on the Redistribution …
33
road gauge and agreed with the relevant authorities and institutions. Often, however,
the carelessness and bravado of drivers and carriers can lead to a threat to traffic
safety as well as the safety of the engineering facilities themselves, which are on the
route of an oversized vehicle. This situation is one of many situations that during the
operation of the facility may cause a sudden redistribution of internal forces. Damage
to the structure of the bridge structure may be associated with economic effects in
the form of costs of repair, possible demolition or reconstruction, but also with social
effects [9], the scale of which can be discussed depending on the communication
significance of the damaged structure.
An example of such an event is described in article [10], which presents damage
to the structure of the viaduct located in the town of Borkowo above the Tri-City
beltway, which is one of the most important communication routes in the Pomeranian
Voivodeship.
The supporting structure of the viaduct span was damaged as a result of an oversized vehicle of an oversized vehicle—an excavator transported on a tow truck. Three
of the four main girders in the central part of the second span were significantly
damaged (Figs. 2 and 3a). As a result of the impact with the span No. 2, practically
three of the four girders disengaged from the work in the central part, changing the
static (work) scheme of the entire facility (Fig. 3b). Damaged girders adopted the
diagram of suspended brackets and the weight of this part of the structure was redistributed to the new static system of the object. Both girders damaged in their other
parts (support sections) as well as girders in neighboring spans suffered overloads.
Immediately—until static and strength analyzes were carried out—the object was
decommissioned by completely preventing traffic on it. In addition, the structure of
the damaged span was supported on temporary supports.
In connection with the emergency condition of the facility, static and strength
calculations of the viaduct were carried out [11]. The following variants of the object’s
calculations were considered:
• undamaged condition—to determine the level of internal forces and stresses for
which the object was designed,
• damaged condition—the damages of the structure of the span No. 2 resulting
from the impact were reproduced—internal forces giving the image of strain of
the damaged structure were determined,
• condition after dismantling of bay 2—the level of internal forces in the remaining
part of the object was analyzed in a changed static scheme compared to the original,
• states reflecting the individual stages of disassembly of bay 2 in order to check
the level of structural effort, and in particular—pillar transoms.
The static and strength analyzes of the viaduct structure showed, in accordance
with previous assumptions, that as a result of vehicle impact the static system of the
object changed significantly [11]. Virtually completely destroyed three girders in the
middle zone of bay 2 adopted a diagram of brackets and a redistribution of weight
took place throughout the entire facility (Fig. 3a, b) In the changed static system under
the influence of constant loads, taking into account possible temperature changes and
snow retention, the system was overloaded load-bearing viaduct both in the support
33
road gauge and agreed with the relevant authorities and institutions. Often, however,
the carelessness and bravado of drivers and carriers can lead to a threat to traffic
safety as well as the safety of the engineering facilities themselves, which are on the
route of an oversized vehicle. This situation is one of many situations that during the
operation of the facility may cause a sudden redistribution of internal forces. Damage
to the structure of the bridge structure may be associated with economic effects in
the form of costs of repair, possible demolition or reconstruction, but also with social
effects [9], the scale of which can be discussed depending on the communication
significance of the damaged structure.
An example of such an event is described in article [10], which presents damage
to the structure of the viaduct located in the town of Borkowo above the Tri-City
beltway, which is one of the most important communication routes in the Pomeranian
Voivodeship.
The supporting structure of the viaduct span was damaged as a result of an oversized vehicle of an oversized vehicle—an excavator transported on a tow truck. Three
of the four main girders in the central part of the second span were significantly
damaged (Figs. 2 and 3a). As a result of the impact with the span No. 2, practically
three of the four girders disengaged from the work in the central part, changing the
static (work) scheme of the entire facility (Fig. 3b). Damaged girders adopted the
diagram of suspended brackets and the weight of this part of the structure was redistributed to the new static system of the object. Both girders damaged in their other
parts (support sections) as well as girders in neighboring spans suffered overloads.
Immediately—until static and strength analyzes were carried out—the object was
decommissioned by completely preventing traffic on it. In addition, the structure of
the damaged span was supported on temporary supports.
In connection with the emergency condition of the facility, static and strength
calculations of the viaduct were carried out [11]. The following variants of the object’s
calculations were considered:
• undamaged condition—to determine the level of internal forces and stresses for
which the object was designed,
• damaged condition—the damages of the structure of the span No. 2 resulting
from the impact were reproduced—internal forces giving the image of strain of
the damaged structure were determined,
• condition after dismantling of bay 2—the level of internal forces in the remaining
part of the object was analyzed in a changed static scheme compared to the original,
• states reflecting the individual stages of disassembly of bay 2 in order to check
the level of structural effort, and in particular—pillar transoms.
The static and strength analyzes of the viaduct structure showed, in accordance
with previous assumptions, that as a result of vehicle impact the static system of the
object changed significantly [11]. Virtually completely destroyed three girders in the
middle zone of bay 2 adopted a diagram of brackets and a redistribution of weight
took place throughout the entire facility (Fig. 3a, b) In the changed static system under
the influence of constant loads, taking into account possible temperature changes and
snow retention, the system was overloaded load-bearing viaduct both in the support