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deflection high shear classification of cross section rolled sections comparision steel structures runoff and floods irrigation reservoir hydrograph precipitation hwre is 875 is 800 loading on truss types of trusses method of joints member forces panel point loads islam ebs stiffners plate girder web buckling and crippling laterally supported beams web crippling bending low shear laterally supported beams block share failure rupture of critical section yielding of gross section tension member specifications numwerical examples roof truss