Question

The point loads are placed at the fixed positions shown in the figure and they are live loads. E C (centre) f = 32 Mpa fer= 3 MPa fsv = 500 MPa E = 200 GPa E = 28600 MPa a Cross section The following values are used for the question. . l = 3 m load before cracking • 12 = 2.5 m . P = 2 KN . a = 50 mm . G-5 kN/m • b = 550 mm . Q = 0 kN/m . C= 450 mm • Ase = 800 mm • Ast = 4960 mm load after cracking • P = 20 kN . G-15 kN/m . Q = 20 kN/m

Answer 1

Calculation of Neutral axista 0.85fc! STRESS 0.003 NA ZA CNA V (CNA-50) E'-0.003 (NA-50) P ENA ----I Strantes en let -- based on assumptions E Strain, stres profiles:- (a = B.CNA) VT= Ċ ;, Astxfy = Ascxfy +0.25 f'xbx {0.25 (NA} 4960x500 = 800 x Esxěs' +0.85 X 32 X$50X0.85 CNA 2.48X10°- 800 X 2 X10*x0.003 (CNA-50)+10404 CNA 2.48X10CNA = 480 X103 CCNA-50 ) +10404CNA? - 2486 X10CNA +10404 (Na 2 – 2981064480 X10%casa = 0 CNA = 203.5 6mm a = 0.85 X203.56 Mn = Cs'x (g-d') + To (d-y) - Ase x Es x Bs' (@_d') tAst xfy x(@_d). = 800x 2x10°x 2.263x163/0.35X203:56 - 50 ) + 4960x500x2600 -0.858203.56) 1.2867X109 N-mm (07) 1286.67 km-m CamScaco. Mn = 0.85 X 1286.67 - 1093.67xn-m = 0