Civil Engineering Online Review

A wooden purlin is used on a truss with a top chord inclined at 30° with the horizontal. The purlin is 50mm x 100mm and has length of 3.5m spaced by 0.45m. on center. It carries a live load of 750Pa, weight of rooling is 120 Pa and ceiling load equal to 140 Pa. Using Apitong.

1) Which of the following gives the uniform load carried by the purlin is N/m?

2) Which of the following give the maximum flexural stress.

3) Which of the following gives the vertical deflection of the purlin.

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A beam having a value of EI equal to 100,000 kN.m² is loaded as shown.

1) Which of the following gives the deflection at the mid span if the middle support is removed.

2) Which of the following give the deflection at the mid span due to a unit load upward if the middle support is removed.

3) Which of the following gives the reaction at the middle support.

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A 3 meter wide wall footing supports a 300mm wall. It is reinforced with 25mm diameter bars with concrete converging of 75mm. Strength of concrete is 21MPa, Fy = 415MPa

1) Which of the following gives the available space for development?

2) Which of the following gives the development length required development length required by the code?

3) When the required development length is smaller than the space available for development, the practice is to increase the bar diameter and spacing of the bars. Which of the following gives the maximum diameter to be used?

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A contractor wish to buy a machine worth 1 million after one year. If the bank gives an interest of 1.5% compounded monthly.

1) What single amount must be deposit now in order to have the desired amount after one year?

2) What amount must he deposit at the bank at every beginning of the month in order to have 1 million after one year?

3) If he deposits P100,000 at the beginning of each month for 6 months starting 6 months from now, how much more will the contractor has to have to buy the machine?

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The beam shown weighs 30N/m.

1) Which of the following gives the tension force?

2) Which of the following gives the reaction at the pinned support?

3) Which of the following gives the angle that the reaction makes with the horizontal measured in counterclockwise direction.

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A beam is loaded as shown on the figure.

1) Which of the following gives the reaction at A?

2) Which of the following gives the maximum shear?

3) Which of the following gives the maximum moment?

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A rigid block weighing 176.4 kN is attached as shown on the figure. If the block is to remain horizontal.

1) Which of the following gives the ratio of the load carried by each load?

2) Which of the following gives the stress of the bronze?

3) Which of the following gives the elongation of the rods?

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A simply supported steel beam carries a uniform concrete slab 200mm thick. It carries a ceiling load of 500 Pa and live load pressure equal to 2000Pa. The length of the beam is 6meters and is spaced at 2m. on centers. Unit weight of concrete is 24kN/m². Allowable bending stress for steel beam is 0.66Fy. Modulus of elasticity is 200GPa. F_y = 248MPa.

1) Which of the following gives the uniform load pressure carried by the beam?

2) Which of the following gives the load carried by the beam in kN/m?

3) Which of the following gives the most economical section?

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A village has 3 alternatives to choose from in replacing the existing piping system. A pump is required and is estimated to last for 10 years. Replacement will be for 30 years project. Pipes will be installed will last for 30 years. At an interest of 15%.

1) Which of the following gives the present value of alternative one?

2) Which of the following gives the present value of alternative two?

3) Which of the following gives the best option?

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Compound shaft shown is attached to rigid supports.

For the bronze segment AB:

Diameter = 75mm

G = 35GPa

τ = 60MPa

For steel segment BC:

Diameter = 50mm

G = 83GPa

τ = 80MPa

1) Which of the following gives the ratio of b/a so that each material will be stressed to its max. permissible limit.

2) Which of the following gives the reaction at A.

3) Which of the following gives the max. angle of twist when a = 1m.

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From the given figure shown.

1) Which of the following gives the deviation of B relative to the tangent drawn at A.

2) Which of the following gives the deviation at D relative to the tangent drawn at A.

3) Which of the following gives the deflection at D.

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A tied column having the given cross section shown is reinforced with six-32mmØ bars.

fc’ = 21MPa

fy = 415MPa

1) Which of the following gives the reinforcement ratio in percent?

2) Which of the following gives the ratio of e/h if the eccentricity is 250mm?

3) Which of the following gives the value of the max. load P_n that the column could carry using the interaction diagram?

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The implementing rules and regulations of P.D. 1594 states that no award of contract shall be made to a bidder whose bid price is higher than the allowable government estimate (AGE) or the Approved Agency Estimate (AAE), whichever is higher, or lower than seventy percent (70%) of the AGE. The AGE shall be equal to one half of the sum of the AAE and the average of all responsive bids. For purposes of determining the average of all responsive bids, bids higher than one hundred twenty percent (120%) of the AAE or lower than sixty percent (60%) of the AAE shall not be considered. An unbalanced bid shall be defined as a bid containing one or more pay items that are thirty percent (30%) higher than the unit AGE in respect to major items whereas other pay items being defined as pay items representing at least twenty percent (20%) of the AAE or the first two items having the highest percentage of the AAE or those indicated/specified in the instructions to Bidders.

The itemized AAE and Bids for a project are as follows:

1) Which of the following gives the min. value of bid to be automatically considered as major item?

2) What are the major items?

3) Which of the following are the balance bid?

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A 4m length pipe having a diam. of 600 mm is to be installed in one hour at a cost of P570/m. 1 foreman has a rate of P50/hr, 2 skilled laborers has a rate of P35/hr. A backhoe was rented for P800/hr and a compactor was rented at a rate of P120/hr.

Volume of cement needed is 0.07m³

at P130 per cu.m.

Volume of sand needed is 0.15m³

at P300 per cu.m.

Vat is 10% of equipment, labor and material cost.

Insurance is 30% of equipment and material cost.

1) Which of the following gives the total cost of labor and equipment per meter length of pipe.

2) Which of the following gives the cost of material per meter length of pipe.

3) Which of the following gives the total cost of the project per meter length.

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A rectangular beam has a width of 250mm and an effective depth of 400mm. The beam is reinforced at the top and bottom section with a steel covering of 75mm for the compression bars and has a simple span of 6m.. If carries a uniform live load of 36kN/m and a dead load of 15kN/m. If fc’=21MPa, fy = 276MPa.

1) Which of the following gives the ultimate uniform load?

2) Which of the following gives the nominal moment capacity of the beam at balanced condition?

3) Which of the following gives the total steel area in tension.

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From the given figure shows a base plate connection which carries a moment of 78kN.m. Neglecting the axial load. Nominal tensile strength of the fillet weld is 480MPa.

1) Which of the following gives the tensile capacity of the bolt?

2) Which of the following gives the moment capacity carried by the fillet welds?

3) Which of the following gives the thickness of the weld?

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A block is placed on an inclined plane making an angle of 30° with the horizontal at a vertical distance of 6m. from the horizontal plane. The coefficient of friction between the block and the inclined plane is 0.25. If the block is released from rest.

1) Which of the following gives the acceleration of the block?

2) Which of the following gives the velocity of the block if it has traveled 3m?

3) Which of the following gives the time at which the block landed on the horizontal plane.

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A projectile is fired upward and to the right at an initial slope of 4 vertical to 3 horizontal and hits the ground at a point 2m. lower than the origin. The maximum height is attained 8m. away from the origin.

1) Which of the following gives the initial velocity?

2) Which of the following gives the maximum height attained by the projectile?

3) Which of the following gives the value of the total horizontal distance when it hits the ground.

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Table 4.5.3 of the 1992 National Structural Code of the Philippines gives the allowable shear on the effective area of fillet welds as 0.30 times the nominal tensile strength of the weld metal.

Section 4.14.6.2 of the NSCP gives the following provisions ofr fillet welds:

1) The effective area of fillet welds shall be considered as the effective length times the effective throat thickness.

2) The effective area of fillet welds, except fillet welds in holes and slots, shall be the overall length of full-size fillet, including returns.

3) The effective throat thickness of a fillet weld shall be the shortest distance from the root to the face of the diagrammatic weld.

Section 4.17.3 of the NSCP gives the maximum size of fillet weld that may be used along edges of connected parts as:

1) Along edges of material less than 6mm thick, not greater than the thickness of the materials.

2) Along edges of material less than 6mm thick, not greater the thickness of the material minus 1.5mm, unless the weld is especially designated on the drawings to be built out to obtain full throat thickness.

Section 4.17.6 of the NSCP gives the minimum amount of lap on lap joints shall be 5 times the thickness of the thinner art joined, but not less than 25mm.

A double fillet welded lap joint is shown. The thickness of plate is 12mm. The nominal tensile strength of the weld metal is 550 MPa.

1) Which of the following gives the maximum size of the fillet weld?

2) Which of the following gives the capacity of the connection?

3) Which of the following gives the capacity of the connection?

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