Hot Dipped Galvanized Wire Mesh, Electric Resistance Welding, Thane, India
   
 
The Ideal Welded Wire Mesh For :-
 
• Concrete Reinforcement
 
• Fencing
 
• Protective Screens For Vehicles
 
• Coverings For Windows & Verandahs Partitions
 
• Machine Guards
 
• Crates For Packing Shelves In Vehicles & Numerous   Other Applications
------------------------------------------------------------ Poultry Protection Meshes

Hot Dipped Galvanized Wire Mesh, Wire Mesh For Concrete Reinforcement, Electric Resistance Welding, Thane, India


Concrete Reinforcement Design Example of Welded Wire Fabric
Consider a slab panel of 3m x 4m continuous on two adjacent edges and discontinuous on the other two. Live Load is 250 Kg/m3. Concrete is M15 grade and steel is HYSD bars in Alternate (1) and WWF in Alternate (2).

Assume a 100 thk slab from deflection criteria as per CI:23.1
Note-2(IS-456)
Two way Span Aspect Ratio:4/3=1.33
Effec. Depth = 80mm. Lever Arm Factor = 0.798
Limit Mom. Capacity (M15-Fe415)=1.325 Ton. m/m
 
                           Design Loads :

                           Dead Load     0.1 x 2.5      = 0.25 t/m2
                           Floor Finish   0.05 x 2.0    = 0.10 t/m2
                           Live Load       0.25 t/m2
                                                                             0.60 t/m2

 
 

Design Moment = Mom. Coeff x 0.6 x 3 x 3 ton. m/m

Location Moment Coeff
as per Table -22
(IS-456/78)
Design
Moment
(ton/m)
HYSD-Fe480
steel area
required (mm2/m)
WF-Fe480
Steel Area
Required(mm2/m)

1) Short Span -ve Mom. at continuous edge-M.

0.067 0.362 236 203

2) Short span -ve Mom. at mid-span-M

0.050 0.270 176 152

1) Long Span -ve Mom. at continuous edge-M.

0.047 0.254 165 143

2) Long Span -ve Mom. at mid-span-M

0.035 0.189 123 106
 

Min Steel @ 0.12% = 120 mm2/m and spacing not more than 240mm c/c

 
DETAILING :

1)  ProvideY8 @ 240 c/c in short-span direction at top at continuous support with 50% extending upto 450mm from support centre and 50% upto 900mm from support centre.
(Steel Consumed = 14.5m of Y8 = 5.72 Kgs.)

2)  ProvideProvideY8 @ 240 c/c (Max. spacing criteria) in short-span direction at bottom throughout since it is minimum steel.. (Steel Consumed = 51m of Y8 = 20 Kgs.)

3)  ProvideY8 @ 240 c/c (max. spacing criteria) in long-span direction at top at continuous support with 50% extending upto 660mm from support centre and 50% upto 1200mm from support centre. (Steel Consumed = 13.8m of Y8 = 5.42 Kgs).

4)  ProvideProvideY8 @ 240 c/c(Max. spacing criteria) in long-span direction at bottom throughout since it is minimum steel.. (Steel Consumed = 52m of Y8 = 21 Kgs.)

5)  Provide minimum distribution steel for shrinkage & cracking Y8 @ 440c/c to all top steel in direction parralel to the edge strips (Steel Consumed = 24m of Y8 = 9.42 Kgs)

6)  Provide Y8 @ 300 c/c-600 long each way top & bottom as torsion steel at 3 corners
(Steel Used = 21.6m of Y8 = 8.53Kgs.)

Total HYSD Bars used 70.09 kgs Cost @ 16/kg                      1124.44
Binding wire reqd. at approx. 250 bottom joints and 145 top joints with 0.18m of 1.4 dia per joints.
 
0.9 kgs costs @ 20/kg                             18.00
Fitting Cutting etc. labour at 1.5/kg   105.15

                                                        Total  1247.60
ALTERNATE-(2) using WWF

1)  Use 100x100-4x4mm WWF of 900 width at top over short span continuous support. Add 100x200-3.3x2.5mm WWF of 450mm width at top over support. (Steel Consumed = 9.19 kgs)

2)  Use 100x100-4x4mm WWF in the bottom throughout. Add 200x200-3.0x3.0mm WWF in the middle strip zone of 2.25m x 3m (Steel Consumed = 28.37 Kgs)

3)  Use 100x100-4x4mm WWF of 1200 width at top over long span continuous support.
(Steel Consumed = 8.79 kgs)

4)  Provide 600 x 600-100x100x3x3 top & bottom layers WWF as torsion steel at two corners with one edge discontinuous. (Steel Consumed = 3.13 Kgs)


Total WWF used = 49.48 kgs Cost @ 21/kg = 1039.08
Savings achieved by use of WWF = Rs. 208.51 or 16.71 of cost with HYSD detailing.