Exam 01

Question 1

In regards to the entity which has authority over enforcing building codes, the acronym AHJ most nearly stands for:

Answer 1

Authority Having Jurisdiction

Question 2

(T/F) The recorded wind speed during Hurricane Michael exceeded the design wind speed as specified by the AHJ.

Answer 2

True

Question 3

All of the following are considered a dead load except:
Occupants
Weight of structural members
All of the above
Weight of permanent non-structural components

Answer 3

Occupants

Question 4

In un-reinforced concrete ductile or brittle?

Answer 4

Brittle

Question 5

Define slump and why it is important for concrete construction:

Answer 5

Work-ability of concrete ***

Question 6

What does the symbol f’c stand for?

Answer 6

Compressive strength of concrete

Question 7

(T/F) The maximum moment on a continuous beam with a uniformly distributed load occurs at the first interior support.

Answer 7

True

Question 8

The maximum shear on a simply supported beam with a uniformly distributed load occurs at which location on the beam:

Answer 8

At the supports

Question 9

The maximum moment on a simply supported beam with a uniformly distributed load occurs at which location on the beam:

Answer 9

mid-span

Question 10

(T/F) The code specifies minimum flexural reinforcement but not maximum.

Answer 10

False

Question 11

On a continuous beam with uniformly distributed loading, the flexural moment is greatest at:

Answer 11

First interior support

Question 12

What are the likely consequences of adding too much water (more than the design mix w/cm ratio) to a concrete mix?

Answer 12

Reduced compressive strength (f’c)

Increase amount of shrinkage cracking.

Question 13

(T/F) Reinforcement covers dictated by structural drawings are minimums and can be increased at the contractor’s options without detrimental effects.

Answer 13

False

Question 14

(T/F) Steel shear reinforcement (stirrups) is required in all concrete flexural members regardless of the member type, demand and shear capacity of the concrete.

Answer 14

False

Question 15

Per the 03 30 00 Cast-in-Place Concrete Specification, concrete shall not be placed when the outside air temperature is XXXX°F or less unless cold weather concreting practices are followed.

Answer 15

40

Question 16

The reason for ACI 318 specifying maximum aggregate size in concrete mix design is most nearly:

Answer 16

To facilitate placement of concrete around the reinforcement without honeycombing due to blockage by closely spaced reinforcement.

Question 17

Given a project in which only (1) sample for strength tests is required, how should the sample concrete be selected?

Answer 17

Random basis

Question 18

Special inspections for concrete construction such as inspection of formwork is required by the IBC on all commercial projects.

Answer 18

False

Question 19

(T/F) Concrete is strong in tension but weak in compression.

Answer 19

False

Question 20

(T/F) Elastic shortening of concrete is an example of a pre-stress loss that occurs immediately.

Answer 20

True

Question 21

(T/F) Submitals as opposed to RFI’s become a part of the contract documents and thus it is important to make any major changes to the construction documents within a submittal.

Answer 21

False

Question 22

All of the following are example of submittals related to reinforced concrete except:

Erection drawings
Mix design
Reinforcement placement drawings
Curing compound product data

Answer 22

Erection drawings

Question 23

If a concrete sample has a higher slump than per the approved mix design, which of the following is least likely to be the cause:

Answer 23

Too much cement.

Question 24

(T/F) A concrete mix with a w/c ratio of 0.55 is more likely to have numerous shrinkage cracks then a mix with a w/c ratio of 0.45.

Answer 24

True

Question 25

On a continuous beam with uniformly distributed loading, the flexural moment is greatest at:

Answer 25

First interior support

Question 26

The purpose of skin reinforcement which is required on deep beams can best be described as:

Answer 26

To control cracking in the section which is especially critical for deep beams in which the neutral axis is located far away from the tension side of the beam.

Question 27

According to the American Concrete Institute, who is responsible for providing a concrete cylinder cure box at the job site?

Answer 27

Contractor

Question 28

The strength reduction factor for a concrete section controlled by flexure is 0.9 where for compression it is 0.75, what is best explanation for the reason between the different factors.

Answer 28

A concrete member that fails via flexure will provide greater warning signs of the overload than if it fails by shear.

Question 29

(T/F) Increasing the concrete compressive strength of a concrete beam has negligible effect on the ultimate capacity?

Answer 29

True

Question 30

(T/F) Steel shear reinforcement (stirrups) is required in all concrete flexural members regardless of the member type, demand and shear capacity of the concrete.

Answer 30

False

Question 31

According to the American Concrete Institute, who is responsible for obtaining concrete cylinders for testing of the compressive strength.

Answer 31

Owner's Testing Agency

Question 32

Given a conventionally reinforced concrete beam in which the shear demand (Vu) is greater than ½∅Vc, what is the minimum amount of steel shear reinforcement (Av, min) required per linear foot? (Given: Width = 12”, Height = 30”, Clear Cover = 2”, Fyt = 60,000 psi, f’c = 5,000 psi)

Answer 32

0.011 in2/ft

Question 33

How many concrete cylinders must be taken for a single 28-day concrete compression test?

Answer 33

4

Question 34

The concrete framing system for Francis Hall is most nearly described as:

Answer 34

One-way beam

Question 35

The reason for ACI 318 specifying minimum tension reinforcement in concrete flexural members can best be described as:

Answer 35

To guarantee that the flexural strength of the reinforced member is larger than the uncracked concrete section, since if not, when the beam approached it’s failure load, there would not be warning signs of the impending failure.

Question 36

According to the American Concrete Institute, who is responsible for Quality Control: taking actions to ensure that Work meets the requirements of the contract documents?

Answer 36

Contractor

Question 37

Per ACI 318, what is the thinnest section allowed for a cantilevering non-prestressed beam that is spanning 10’?

Answer 37

15"

Question 38

Given a concrete beam in which the shear demand (Vu) is greater than ½∅Vc, the shear capacity of the stirrups (Vs) is less than 4√(f’cbwd) and the depth to the tension reinforcement is 30”, the maximum spacing of the stirrups is most nearly.

Answer 38

15"

Question 39

(T/F) Reinforcement covers dictated by structural drawings are minimums and can be increased at the contractor’s options without detrimental effects?

Answer 39

False

Question 40

The reason for ACI 318 specifying maximum tension reinforcement ratios can best described as:

Answer 40

To ensure that the members fails via tension in the reinforcement, a ductile failure mode in lieu of crushing of the concrete which is not a ductile failure mode.

Question 41

On a simply-supported beam with uniformly distributed loading, the shear is greatest at:

Answer 41

At the supports

Question 42

(T/F) Increasing the concrete compressive strength of a short, non-sway, concrete column has negligible effect on the ultimate capacity?

Answer 42

False

Question 43

(T/F) The design team (architect and/or structural engineer) can require more stringent inspections that required by the building code.

Answer 43

True

Question 44

(T/F) Per the IBC, formwork is only required to be inspected periodically, however per the specification 03 30 00 Cast-in-Place Concrete, formwork is required to be inspected continuously.

Answer 44

True

Question 45

(T/F) Concrete slump and air contents tests shall always be taken at the point of placement, since this is ultimately where the concrete will be placed. and best matches the field conditions.

Answer 45

False

Question 46

(T/F) Once a contractor has received notification that he has passed inspection, the contractor is now relieved from the obligation to adhere to the construction documents.

Answer 46

False

Question 47

(T/F) Per the IBC, inspections are required on every single concrete project that requires a commercial permit regardless of the size.

Answer 47

True

Question 48

(T/F) Per the IBC, special inspection of the formwork for concrete construction is required to be continuous.

Answer 48

False

Question 49

You are the contractor on a 4,000 SF restaurant project. The foundation will contain approximately 40 yards of concrete and will be poured in a single day. What is the minimum amount of samples for strength test specimen's required per ACI 318?

Answer 49

0

Question 50

(T/F) Per the IBC, special inspections are required on every concrete project that requires a commercial permit regardless of the size?

Answer 50

False

Question 51

(T/F) A prestressed concrete double-tee is an example of a post tensioned member.

Answer 51

False

Question 52

The purpose of mild reinforcement (rebar) in a post-tensioned flat slab in addition to the post-tensioning tendons is most nearly:

Answer 52

Due to varying loading and structural configurations it is not practical to entirely eliminate all tension in the slab thus mild reinforcement is added is regions where there tension will still be present in the slab. Also, continuous steel is required for integrity of the structure.

Question 53

The eccentricity “e” of a prestressed members can best be described as:

Answer 53

The distance between the center of gravity of the tendons and the neutral axis of the member.

Question 54

The following are examples of prestress losses in pre-tensioned members except.

Answer 54

Wobble

Question 55

Given that f’c is 5,000 psi, what is the allowable compressive stress at the transfer design stage at the end support of a simply supported beam?

Answer 55

3,500 psi

Question 56

At which stage in the life of a prestress member is the prestress force the highest and the concrete compressive strength the lowest?

Answer 56

Transfer

Question 57

Pre-Tension | Pre-Cast

Answer 57

double tees, hollow-core planks, precast piles. | The steel reinforcement (tendons) used for pre-tensioned members is bonded. (5% tolerance)

Question 58

Post-Tension | Cast in place

Answer 58

cast-in-place concrete slabs, beams, etc. | The steel reinforcement used for post-tensioned members can be bonded or unbonded. (10% tolerance)

Question 59

Bonded

Answer 59

prestressing tendons permanently bonded to surrounding concrete, for post-tensioned concrete this is accomplished via grouting of the tendons. (normal rebar)

Question 60

Unbonded

Answer 60

prestressing tendons allowed "free" longitudinal movement relative to the concrete, typically unbonded tendons are encased with plastic sheathing with a corrosion inhibiting grease

Question 61

Types of Prestress Losses:

Answer 61

Elastic shortening of concrete (instant) Long-term creep of concrete (over time) Long-term shrinkage of concrete (over time) long-term relaxation of stress in the prestressed tendons (overtime) Anchor seating loss at transfer

Question 62

Building Codes specify the (1)_______ legal design and construction requirements for a (2)__________

Answer 62

1. minimum | 2. given jurisdiction

Question 63

Why are Building Codes used?

Answer 63

To prevent insure that building will not collapse. This does NOT mean that building will NOT suffer any damage.

Question 64

Building Official

Answer 64

person responsible of reviewing documents. They are in charge of performing inspections.

Question 65

Authority Having Jurisdiction (AHJ)

Answer 65

legal entity in charge of enforcing Building Codes

Question 66

Deferred Submittal

Answer 66

Part of design submitted AFTER permit has been submitted

Question 67

Primary Structural Frame

Answer 67

support building against gravity and environmental loads

Question 68

SAMPLING | You must take samples after (1)____ and before (2)_____ of the load has been discharged.

Answer 68

1. 10% | 2. 90%

Question 69

(T/F) Earthquake forces are a function of the building mass (weight) and stiffness, which means that if a building is located in a high seismic region it is preferable for the building to be heavy and stiff in order reduce earthquake loads on the structure.

Answer 69

False

Question 70

All of the following effect the magnitude of wind loads on buildings except. ``` Height of building Weight of the building Topography surrounding site Size of building Location of building ```

Answer 70

Weight of the building

Question 71

(T/F) A structure designed and constructed to the minimum requirements of the building should should not sustain structural damage during a design earthquake or wind event.

Answer 71

False

Question 72

(T/F) Wind loads increase the higher up from ground surface they are, since their is a reduction is friction with the ground.

Answer 72

True

Question 73

(T/F) Earthquake induced forces is an example of gravity loading on a structure.

Answer 73

False

Question 74

(T/F) A structure design to the minimum requirements of the building code should not collapse when subjected to a minimum design earthquake or wind event.

Answer 74

True

Question 75

Load factors are applied to loads acting on building to account for:

Answer 75

1. Differences in material strength 2. Variation in construction (poor construction) 3. Approximations in design methodology 4. Uncertainty in the magnitude and location of applied load 5. To allow structural engineers to lower the rigor of structural analysis and design and thus remain more profitable.

Question 76

Per the International Building Code, a fire station is required to be designed as what Risk Category?

Answer 76

IV

Question 77

The exposure category (wind design) for Francis Hall is most nearly:

Answer 77

Exposure B