Week 12 Challenge
Barge impact Load: Barge are moving in sea, an accident with bridges nearby is unavoidable. The impact of strike on bridge superstructure and substructure is severe. The weight of Barge and its speed gives impact load. Barge impact loads can't be ignored likely in sea shore.
Obviously the aim is to assess the extent of impact load, and then calculating maximum bending moment and shear stress, to strengthen the components of bridge structure and further to reduce risk of damage and minimise the risk of structural failure.
Dead weightage tonnage of vessel "W" - 52500 DWT
Considered 20% for impact load = 52500 X 20% = 10500 DWT
Barge impact speed (m/s) "V" = 60km/hour = 16.667m/s
Hydrodynamic coefficient "Ch" = 1.25
KE = 500 X Ch X W X V2 = 500 X 1.25 X 10500 X 16.667 X 16.667 = 1822989584.0625N-m
aB= 3100 X ([1+1.3 X 10-7KE]0.5 -1) = 44723.33mm
Barge collision impact force PB
For aB > 100mm, PB =6.0 * 10 6 + 1600 * (aB), in N = 77557328N = 77557.328kN
Coordinates generated for Pier, Cross beam and long beam of bridge.
Pier, Long beam and cross beam created.
Long beam devided in 10 Parts by inseting 9 nodes.
Both long beam devided in 10 parts.
Bracing created for 5m height.
All the frame gradully down ward created.
All the frame gradully down ward created.
Top chord connected by add beam command.
Mid point inserted for top bracings.
Bracings connected by add beam.
Mid point inserted and bracings connected by add beam.
Bow string girder created.
Node copied and pasted at 0.5m dist for mesh of plate.
Both node copied and pasted in Z direction.
One plate created for deck.
23 plates added in X direction.
Set of plates added 13 time in Z direction.
Plates for deck are ready.
Group created for deck plates.
Group created for Pier.
Group created for top chord.
Beams assigned to Group Top chord.
Beams assigned to Bottom Main.
Beams assigned to Pier.
Plates assigned to group Deck.
Property assigned to Cross Beam.
property assigned to verticle hanger.
Property assigned to rest bracings.
Missing property checked.
Fixed support assigned to pier bottom nodes.
Check for multiple structure.
Nodle load choosed for barge impact load.
Load assigned to mid of pier.
Loading diagram.
Analysis done successfully.
Displacement beahaviour of bridge.
maximum bending moment for one Pier.
Bending moment report for pier.
maximum bending moment of one bottom chord.
Report for bottom chord.
Maximum bending moment My of Cross beam.
Report for bending moment of cross beam MZ.
Plate stress of deck MY local.
Report of plate stress for deck.
Top chord.
Maximum bending moment on Top chord MZ.
Report for bending moment on Top chord MZ.
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