Sheet1Height of wall above ground=3mHeight of fencing (barbed wire)=0.6mWidth of wall=0.345mLength of wall=1000mGroundalmost flatWall below ground0.15mMass density of masonary=20.8KN/m3Wind DataBasic Wind speed=47m/sTerrain category=1Class of structure=C[5.3.2.2]Design wind speedVz=Vb.K1.K2.K3Vb=47K1=Probability factor[5.3.1 and table 1]=0.9(considering mean probable design life of wall as 25 years)K2=0.99(terrain category 1 and class of structure C)K3=1that is, ground is almost flatV10=41.877m/sDesign Wind Pressure (PZ)[5.4]Pz=0.6 x (VZ) 2P10=1052.2098774N/m2Wind Load CalculationWind force is given by F=Cp Ae PzChoice of Cf [6.3.2.3 and Table 24]Here, b =1 km(approx), h= 3 m, b/h >160Since wall is on ground Cf=2Force on Barbed WireSolidity ratio=10percentcorresponding value of Cf for single frame having flat sided members [Table 28]1.9Ae=0.1m2F= Cp Ae PzF= Cp Ae Pz=199.919876706NForce on WallF=Cp Ae Pz=2104.4197548N/m2Forces at BaseBending moment due to barbed wire and wall.=10633.1069160657N.mTotal Shear at base=6.5131791411Kn/mCalculation of stresses at baseTotal Weight of masonary at base=22.6044Kn/m width of wallBending stress caused by vertical bending produced at base on extreme edge=6M/bd2=0.5360104306N/mm2Compressive stress due to weight at base=P/A=0.06552N/mm2Maximum tensile stress at extreme fibre for vertical bending=-0.4704904306Check for tensile stressAccording to 5.2.3.2 of IS 1905:1980 Code of practice for structural safety of buildings: Masonry walls (second revision), permissible tensile stress for freestanding vertical walls in vertical bending is 0.07 N/mm2. However, the tensile stress at base of wall at ground level amounts to 0.3 N/mm2, therefore, exceeds the permissible value. The base width of wall is to be increased for tensile stress design. The thickness of wall at various heights is given by:t=h x Sqrt(4808.78(7 x 104+17275h))Thust at height 1m from top=0.2101179656mt at height 1.5m from top=0.2985431524mt at height 2m from top=0.3790565538mt at height 3m from top=0.5220154701m

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