Quiz Bee 2

A wooden log is to be used as a foot bridge to span 2m. gap. The log is to support a concentrated load of 27 kN.

Allowable Shear stress = 1.2 MPa

Allowable bending stress = 6.3 MPa

What is the diameter of the log needed for a maximum shear

• 140

• 200

• 300

• 250

• 82.61

• 165.2

• 116.82

• 233.63

A rectangular beam is reinforced with 3-28mm diameter tension bars and 10 mm diameter stirrups. The beam has a total depth of 550 mm. fc'=21 MPa,fyl=420Mpa, and fyt=280 MPa. Clear concrete cover is 40mm. Specified maximum aggregate size in the mixture is 20mm. Use 1.2D+1.6L. Use phi=0.75 for shear and 0.90 for bending.

Determine the minimum width (mm) of the beam that will be adequate to carry a factored bending moment Mu of 285 kN-m if it is reinforced for tension only with 3-28mm diameter bars.

• 250

• 350

• 400

• 300

Pole AB is 12m long and its weight W=40kN. It is being lifted using cables BC and CD. When the pole is tilted at an angle of 60 degrees from the x-axis, the resultant force acts at point A. Find the tensile force(kN) in cable BC.

• 63.33

• 36.63

• 33.63

• 66.33

• -1.76

• -2.35

• 3.72

• 1.24

What height in meters of a column of special gage liquid having a sp.gr. of 2.90 would exert the same pressure as a column of oil 6 m high having a sp.gr. of 0.80?

• 1.04

• 2.04

• 1.66

• 2.66

An isoscles triangular plate of height 480 mm and base 200 mm is vertically submerged in water with its vertex at the liquid surface and the base is parallel to the liquid surface. Obtain the location of the force from the liquid surface, in mm.

• 390

• 380

• 370

• 360

A foundation in a layer of soft clay was supported by group of piles consisting of 12 piles having a diameter of 60 cm and length of 12 m as shown. Calculate the design load on the pile group if the piles are acting individually. Factor of safety is 3.

• 3486.1 kN

• 4017.4 kN

• 4434.3 kN

• 2863.2 kN

• 1.48

• 1.93

• 1.84

• 1.39

• 325.25m

• 111.51m

• 156.25m

• 100.32m