(Solved): 3. A beam AB has a uniformly distributed load of 18kN/m along 5m as shown in Figure Q3 (a). The c ...

3. A beam $$\mathrm{AB}$$ has a uniformly distributed load of $$18\mathrm{kN}/\mathrm{m}$$ along $$5\mathrm{m}$$ as shown in Figure Q3 (a). The cross section of the beatn is shown in Figure Q3 (b). Determine: (a) the maximum bending stress at the top and bottom of the beâm. Next, draw the bending stress distribution along the height of the beam. (b) the maximum shear stress of beam at $$1\mathrm{m}$$ from support $$\mathrm{A}$$ and draw the stress distribution over the cross section at every $$20\mathrm{mm}$$ interval. Sebatang rasuk AB dikenakan beban teragih seragam $$\{8\mathrm{kN}/\mathrm{m}$$ sepanjang $$5\mathrm{m}$$ seperti dalam Rajah Q3(a). Keratan rentas rasuk adalah seperti dalam Rajah Q3(b). Tentukan: (a) tegasan lentur maksimum pada bahagian atas dan bawah rasuk. Seterusnya, lukiskan taburan tegasan lentur di sepanjang hkuran tinggi rasuk. (b) Tegasan ricih maksimum rasuk pada $$1\mathrm{m}$$ daripada penyokong A dan tukiskan taburan tegasan sepanjatg keratan pada setiap selang $$20\mathrm{mm}$$.