DESIGN OF SHEAR KEY as per IS800 and concrete checks are IS450-2000
Base plate design as per IS800 codal provisions, Shear key is provided to increase the resistance to sliding. The shear key is generally an extension of the vertical stem and extends below the bottom of the base to help reducing the thickness of the anchor bolts by absorbing the shear force.
Base Plate length = 650 mm
Base Plate Width = 650 mm
Maximum Horizontal shear F = 53.000 kN Ref: Annexure G.5
Characteristic comp. strength fck = 30 N/mm² IS:456-2000 Table 2
Allowable bearing stress sb = 0.25fck IS:456-2000 cl. 34.4
= 7.5 N/mm2
Bearing Stress factor = 1.25
Depth required D = F/(1.25*sb*L)
= 11 mm
Provide shear key depth below grout 100 mm
L
= 500
Bearing pressure on the plate p = F/(D*L)
= 1.06 N/mm2
The
shear key is designed as a plate is fixed on two sides and free on other two
sides.
D
= 150
Max. Bending moment = 1.06 x 100 x (100/2+50)
= 10600 N.mm
Bending Stress factor = 1.33
Allowable bending stress = 185*1.33
= 246.05 N/mm2
Thickness of shear key t = sqrt(6M/sbc)
= 16.1 mm
Thickness provided = 25 mm OK
Provide shear key as 500 x 150 x
25mm
L/C:
115
Fz – Direction Node:
64
Maximum Horizontal shear F = 51.500 kN Ref:
Annexure A2
Characteristic comp. strength fck = 30 N/mm² IS:456-2000 Table 2
Allowable bearing stress sb = 0.25fck IS:456-2000 cl. 34.4
= 7.5 N/mm2
Bearing Stress factor = 1.25
Depth required D = F/(1.25*sb*L)
= 10.99 mm
Provide shear key depth below grout 100 mm
Bearing pressure on the plate p = F/(D*L)
= 1.0 N/mm2
The
shear key is designed as a plate is fixed on two sides and free on other two
sides.
L
= 500
D
= 150
Max. Bending moment = 1.03 x 100 x (100/2+50)
= 10300 N.mm
Bending Stress factor = 1.33
Allowable bending stress = 0.66*230*1.33
= 201.894 N/mm2
Thickness of shear key t = sqrt(6M/sbc)
= 17.5 mm
Thickness provided = 25 mm OK
Provide shear key as 500 x 150 x
25mm
BREAKOUT CHECK FOR PEDESTALÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
      Check for shear break-out strength                                                                                         Â
           FX direction                                                                                                    Â
           For M30 tc,max                         =        2.2      N/mm2    IS:456, Table 24Â
           Maximum Horizontal Shear                  Fx       =        100.000           kN   Â
           Actual shear stress                       =        100*1000/(375*750)                                       Â
                                            =        0.36     N/mm2     Assuming minimum p of 0.15%                                                Â
           For M30 tc,perm                         =        0.2      N/mm2      IS:456, Table 23                  Â
        Design Shear Vs                                             =        (0.36-0.2)*(375*750)                    Â
                                             =        45000.00         N                               Â
           Spacing assumed in pedsestal height (Sv)        =        200      mm     `                     Â
           Effective depth (d)                        =        375      mm                            Â
           No. of legs assumed                                      Â
=Â Â Â Â Â Â Â Â 10Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
                                                                       Vs       =        ssv . Asv .d                                      Â
                                                                                                          Sv                                         Â
           Dia of leg required                                           =           SQRT(45000*200/(230*10*PI()*0.25*375))                                           Â
                                                                                    =        3.64     mm                            Â
Â
           Dia of leg provided                                           =        10       mm
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