Simulation for the Truck-bridge Collision
Simulate the truck-bridge collison and discuss the collision
induced damage inside the bridge.
The frequent occurrence of accidental collisions between over-height
trucks and bridge superstructures in recent years has seriously affected
the safety of bridge infrastructure and traffic systems in metropolitan
areas. Such collisions highlight the importance of scientific research
in this field and therefore the performance of three typical bridge
superstructures subjected to collision by an over-height truck is studied
in this paper through scaled model tests. A steel box girder, a steel
plate girder and a reinforced concrete (RC) T-beam girder are adopted
to represent different types of bridge girders while a cylindrical tank
with counterweight is adopted to represent a typical over-height truck.
Finite element simulation is also conducted and the results are compared
with the experimental findings. The results obtained by test and simulation
are consistent and both of them indicate that under collision conditions
local failure is found to be the main failure mode for the steel plate
and RC T-beam girders, whilst global failure is found to be the main
failure mode for the steel box girder bridge model.
With the increasing expansion in civil engineering in recent years,
Fiber Reinforced Polymer (FRP) has been recognized as a competitive
material to those conventional materials in bridge structures, especially
for footbridge design and construction. However, collision accidents
between over-high trucks and bridge superstructures frequently happened,
which seriously threaten the safety of bridges and traffic system of
city. To ensure FRP structure can be more widely used for bridge construction,
structure-vehicle collision mechanism should be studied, so as to improve
collision-resisted ability of bridge superstructure. In this paper,
a collision testing between over-high trucks and bridge superstructure
was carried out, including failure process, displacement response, and
failure mode and mechanism. The test results will be used for finite
element analysis and further verification, so as to improve structural
performance of FRP superstructure under such impact load.
In order to compensate for the insufficient of the research on collisions
between over-high trucks and bridge superstructures and improve their
engineering design method, a simplified model for the collision between
over-height trucks and bridge superstructures is proposed based on the
accident investigations and high precision finite element (FE) analysis.
And then differential equations for the simplified model are set up
and some parameters of the simplified model are calibrated by numerical
experiments. Thus, the collision loads of the simplified model are obtained.
What's more, to further meet the requirement of the engineering design,
simplify formed engineering design formulas are put forward and the
main value of the basic parameters of engineering design formulas are
presented in table. Finally, the comparison between simplified model,
design formulas and FE method are carried out. The comparisons indicate
that the collision loads obtained by the proposed simplified model and
design formulas agree well with the FE results and are conservative
for engineering, which could provide references for engineering design.
Recently the collisions between over-high trucks and bridge superstructures
have become a serious threaten to the safety of city traffic. In order
to reduce the loss due to collision accidents, it's critical to precisely
calculate the collision loads. This work firstly simulates the collision
process between over-high trucks and bridge superstructures based on
high precision finite element model, and primary influencing factors
that control the collision loads are discussed. Then by ignoring the
unimportant influencing factors, a simplified model for the collision
between over-high trucks and bridge superstructures is developed. The
time-history results of simplified model agree well with those of the
high precision finite element model, so the proposed simplified model
can be used in practical application.
An accident of collision between over-high truck and pedestrian bridge
is simulated by means of high-precision finite element model, the reasons
of collapse is analyzed and the corresponding protection measures is
suggested. This paper firstly introduced the proposed numerical model
and then described the collision process of simulation. Based on the
analytical results, the reason of the girder falling is discussed and
the response of the girder after the collision is analyzed. Finally,
the corresponding protection measures are proposed and the effectiveness
of these measures is verified.
Recently, accidents of collisions between over-high trucks and bridge
superstructures happen frequently, which seriously threaten the safety
of bridges and city traffic system. In order to reduce the loss due
to the over-high-truck-to-bridge collision, the collision resistance
of bridge superstructures need to be strengthened, on which the research
is still very lack currently in China. Based on the high-precision nonlinear
finite element simulation and accident investigation, this paper discusses
the damage mechanism and collision loads of impact between over-high
trucks and bridge superstructures. Study results show that the damage
modes of bridge superstructures impacted by over-high trucks include
global deformation damage, local damage and girder-falling. The impact
loads that controls the damage modes include the collision impulse and
the local punching force, which differ a lot for different types of
In order to improve the design and the capacity of anti-collision of
bridge super-structure , the mechanism of collision between over-high
truck and bridge super structure was studied. Based on actual accident
investigations and high-precision finite element simulation, classical
collision accident of bridge super structure and over-high truck was
simulated. The failure modes and displacement response of the bridge
super structure under collision of over-high truck were analyzed , and
the calculation method for collision load were discussed. Results indicate
that t he failure modes of bridge super structure impacted by collision
of over-high truck include the global and local failures, which can
be designed by the simplified half-sine collision load time history.
Accidents of impact between over-high trucks and viaducts happen frequently.
20% of failures of viaducts in Beijing are because of over-high trucks
impact. Detailed study on the mechanism of truck-viaduct impact is important
to assess the damage of impact to the viaducts. Due to the difficulties
of experimental research on this problem, computer simulation has obviously
advantages. The steel-concrete composite bridge has been widely used
in bridges because it can fully take the advantages of the two materials.
But due to the thin thickness of steel plate at the bottom of the bridge,
when the steel tension zone is damaged by impact, the safety of the
whole structure will be seriously threatened. So the truck impact for
composite viaducts should be considered. This paper presents the high
precision simulation for the truck- composite viaduct impact based on
high performance nonlinear finite element analysis. The computational
results show that the impact may result in serious damage to the bridges
and protective equipment should be given for composite bridges.
Accidents of impact between over-high trucks and viaducts happen frequently.
Detailed study on the mechanism of truck-viaduct impact is important
to setup the computational method of impact. This paper presents the
high precision simulation for the truck-viaduct impact based on high
performance nonlinear finite element analysis. And the influence of
truck speed to the damage of the bridge is discussed. The computational
results can be used for the further studies on truck-viaduct impact