Question

A footing, 2 m. x 3 m. in plan and 0.50 m. thick, is
designed to support a 0.50 m. square column. Due to
architectural requirement, the column is so located that
its external face is flush with the shorter edge of the
footing. The column, however, is located along the minor
principal axis of the footing. The column load, including
the weight of the column itself, is 80 kN. Assume the
concrete to weigh 24 kN/m3
.

38. Evaluate the maximum pressure induced on the
supporting soil, in kPa.
A. 68.50 KPa C. 58.70 KPa
B. 60.30 KPa D. 71.60 KPa
39. Evaluate the pressure at a point exactly below the
column
A. 64.5 KPa C. 53.1 KPa
B. 61.7 KPa D. 54.3 KPa

Answer 1

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у 1 کوه The fig. shows the Footing and Column location. Column is acting al- an ecentricity of 5-oose of footing, (od: 1/2) e = 1.5 - 1.25m * V120.5 e=1250. 1 3m į Z= 3 Section modulus 133) : 3m 3 jooting p="sokn Moment due to eccenloscily, M= P.e 2) Load on = 80x1.25 M = 100 km (1) stress below the footing dee to colema load, P * & 2m I h / А. Jou 3 M Z Max. pressure, 80 + = 46.67 km2 (03) kPa (3x) = 24x0,5 = 1,2 kN/m267) Kepa slab, pressure due to self weight of (sef he x depth) Max. pressure ordeeced on Supporting Sol – 46.67+12 = 58.67 ~58.7 kPa below the Colemn.Cat 1.25m point m from centie :: option Ċ'ins correct, (@) Pressure at a exactly Ze= (bod32 (2x133) = 3.6 m3 (1.25) 7.25 pressure dele to Colerm Load, o= P + M L loo 80 zxa) 3.6 o = 41.11 kPa we have premue de to sell weight of slab = 12 kPa Pressure encretly below the column = 411 +12 - 53.11 K Pa ~53.1 kPa co Option Ĉ its correct.