Two-way slab with four fixed edges Bending moments M - Deflections f - Shear forces V - Equivalent uniform reactions p Example 1: lx=4.0 m, ly=5.0 m, p=11.44 kN/m2, h=170 mm, C30/37 (E=32.80 GPa) → ε=5.00/4.00=1.25 → kx=0.709, ky =0.291, vx=vy=0.874, am=0.0194, ρxerm=0.500, ρyerm =0.500, υxerm=0.300, υyerm=0.250 → fm=0.0194· 11.44· 103N/m2· 4.04m4/(32.80· 109N/m2· 1.0m· 0.173m 3)=353· 10-6m=0.353 mm, px=0.709· 11.44=8.11 kN/m, py=0.291· 11.44=3.33 kN/m, Mx=0.874· 8.11· 4.02/24=4.73 kNm/m, Mxerm=-8.11· 4.02/12=-10.81 kNm/m, My=0.874· 3.33· 5.02/24=3.03 kNm/m, Myerm=-3.33· 5.02/12=-6.94 kNm/m, V xerm=0.500· 11.44· 4.0=22.88 kN, Vyerm= 0.500· 11.44· 4.0=22.88 kN, pxerm=0.300· 11.44· 4.0=13.73 kN/m, pyerm= 0.250· 11.44· 4.0=11.44 kN/m. Example 2: lx=5.0 m, ly=4.0 m, p=11.44 kN/m2, h=170 mm, C30/37 (E=32.80 GPa) → ε=4.00/5.00=0.80 → kx=0.291, ky =0.709, vx=vy=0.874, am=0.0079, ρxerm=0.400, ρyerm =0.400, υxerm=0.200, υyerm=0.240 → fm=0.0079· 11.44· 103N/m2· 5.04m4/(32.80· 109N/m2· 1.0m· 0.173m 3)=351· 10-6m=0.351 mm, px=0.291· 11.44=3.33 kN/m, py=0.709· 11.44=8.11 kN/m, Mx=0.874· 3.33· 5.02/24=3.03 kNm/m, Mxerm=-3.33· 5.02/12=-6.94 kNm/m, My=0.874· 8.11· 4.02/24=4.73 kNm/m, Myerm=-8.11· 4.02/12=-10.81 kNm/m, V xerm=0.400· 11.44· 5.0=22.88 kN, Vyerm= 0.400· 11.44· 5.0=22.88 kN, pxerm=0.200· 11.44· 5.0=11.44 kN/m, pyerm= 0.240· 11.44· 5.0=13.73 kN/m.
|