Week 12 Challenge

AIM :- To calculate the barge impact load on bridge and then after that apply that load in stadd pro to analyse and results.

LIVE LOAD CALCULATION:-

Given:-

DWT = 52500

Speed = 60 km/h = 16.67 m/sec

Ch = 1.25

KE = 500*1.25*52500*16.67*16.67

= 9118229.53125 N-mm

Barge damage depth, aB

aB = 3100 * ([1+1.3*(10 Power minus 7)*9118229.53125) power 0.25 -1]

= 4581.8 mm

As aB> 100 mm

Pb = 6*(10 power 6)+1600*aB)

= 13330.88 KN

• PROCEDURE:-

1. Firstly a node is created. The height of pier is taken as 5 m.

Figure Pier is created using node

2. After that with the help of translational repeat the frame of bridge is created.

Figure Bridge frame is created with the help of node using translational repeat option

3. The bridge deck is created by using the mesh size of 0.5*0.5 m. The thickness of deck slab is 0.5 m

4. A square pier of diameter 2.5 m x 2.5 m is created.

5. A fixed support is created at the base of the pier.

6. Rectangular girder and cross beam of size 0.6 m * 1.2 m is created using define option.

7. Cross beam of size 0.6 m * 1.2 m is created.

Figure 3D view of bridge

• LOADING

Firstly self weight i.e gravity load of -1 is applied on the whole structure

Loading-----load case details-----ADD-----POINT LOAD------ADD------MEMBER LOAD ------NODE

Figure Defined loading condition

Figure Loading diagram of Barge impact Load

BARGE IMPACT LOAD is applied at the C.G of the pier in the form of point load at the node.

• RESULT ANALYSIS:-

1. STATIC CHECK:- Static check is ok as the difference between load and reaction is zero.

Figure Static check

2. DEFLECTION:- Maximum deflection of the structure is 2.39 mm in Z direction at node 25.

3. REACTION:-

Horizontal	Vertical	Horizontal
Fx (KN)	Fy (KN)	Fz (KN)
403.455	2300	11251

Moment	Moment	Moment
Mx (KN-m)	My (KN-m)	Mz (KN-m)
21840	300.178	300

Figure Maximum reaction coming out of all the load cases

4. BEAM RESULTS:- GIRDER

Mz (KN-m)	My (KN-m)	Shear y (KN)	Shear Z (KN)
288.054	14994	608.067	394

• CROSS BEAM

Mz (KN-m)	My (KN-m)	Shear y (KN)	Shear Z (KN)
22.460	1361	377	36

Figure Bending moment diagram of girder

Figure Shear force diagram of girder

5. PLATE STRESSES

Deck slab

Mx (KN-m/m)	My (KN-m/m)	Mxy (KN-m/m)	Shear X (N/mm2)	Shear Y (N/mm2)
31.676	26.133	32.674	0.572	0.160

6. PIER RESULT

Mz (KN-m)	My (KN-m)	Shear y (KN)	Shear Z (KN)
1719	21840	403.50	11251

Figure Pier bending moment

Figure Pier shear force