Design for shear (pad and strip base:EC2)
Pad base shear design check
Calculate tension reinforcement ratio (cl 6.2.2(1)): 

ρ_{l}  =  min(A_{sl} / (L*d), 0.02)  
where 

A_{sl}  =  area of tension reinforcement  
L  =  unit width of foundation in which A _{sl} is provided  
d  =  effective depth of reinforcement in direction considered  
F_{y,sup} 

Horizontal force acting on support Ydirection in STR/GEO limit states  from analysis  


Calculate k (cl. 6.2.2(1)): 

k  =  min(1 + (200mm/d)^{1/2}, 2.0)  


Calc min shear strength (NDP) (cl. 6.2.2(1)): 

v_{min}  =  1.035k^{3/2}f_{ck} ^{1/2}  EC2 recommendations 
v_{min}  =  1.035k^{3/2}f_{ck} ^{1/2}  for UK, Irish, Malaysian and Singapore NA 


Calculate resistance without shear reinforcement for X and Y directions (cl. 6.2.2(1)): 

v_{Rd.c,x}  =  max(C_{Rd.c} * k * (100 N ^{2} /mm ^{4} *ρ _{l} * f _{ck} ) ^{1/3} ,v _{min} )  
v_{Rd.c,y}  =  max(C_{Rd.c} * k * (100 N ^{2} /mm ^{4} *ρ _{l} * f _{ck} ) ^{1/3} ,v _{min} )  


Maximum allowable shear resistance (cl. 6.2.2(6)); 

v_{Rd,max}  =  1.5 *v * f_{cd}  
where 

f_{cd}  =  concrete design compressive strength  
v  =  cracked concrete reduction factor  


If applied design shear force is less than or equal to the shear resistance i.e v_{Ed} ≤ v_{Rd} = min (v_{Rd,c} , v_{Rd,max}) the foundation thickness is adequate for beam shear. 
Strip base shear design check
The principle of the strip base shear design check is similar to that for the pad base. Only the direction X is checked (around Yaxis) using segment widths.