Mixed Deck — All ASCE Topics Flashcards

For normal-weight concrete, which ACI expression approximates the modulus of elasticity Ec in psi?

Answer: Ec = 57,000√f'c

ACI 318 permits Ec = 57,000√f'c psi for normal-weight concrete.

What factor of safety is typically applied to the ultimate bearing capacity of shallow foundations in allowable stress design?

Answer: 3.0

A factor of safety of about 3 is customary to account for uncertainty and limit settlement.

Time of concentration for a watershed is best defined as the time:

Answer: For runoff to travel from the hydraulically most remote point to the outlet

Tc is the travel time from the hydraulically most distant point, the point at which the whole watershed is contributing flow.

What is the primary design consideration in quality assurance for American Society of Civil Engineers Certification?

Answer: Safety, functionality, and compliance with applicable codes

In American Society of Civil Engineers Certification, quality assurance design must prioritize safety, functionality, and code compliance above all other considerations.

What environmental consideration applies to project management?

Answer: Sustainable practices and environmental compliance are required by regulations and professional ethics

Environmental compliance and sustainable practices are both regulatory requirements and professional ethical obligations for engineers.

What quality control measure is most important in design principles?

Answer: Continuous quality assurance throughout the project lifecycle

Continuous quality assurance throughout the project lifecycle catches issues early when they are easiest and least costly to correct.

Biological denitrification requires:

Answer: Anoxic conditions and an organic carbon source

Denitrifying bacteria use nitrate as the electron acceptor when no oxygen is present, and they need a carbon source such as methanol.

Asphalt paving, curbs, and site fencing are specified in which MasterFormat division?

Answer: Division 32

Division 32 Exterior Improvements covers paving, curbs, fencing, and planting.

In a coordinated set of contract documents, the general division of roles is that specifications define ___ while drawings show ___.

Answer: Quality and requirements; quantity, location, and relationships

Specifications describe qualitative requirements, while drawings convey quantity, size, and location.

Hydrometer analysis is used to determine the grain size distribution of which soil fraction?

Answer: Particles passing the No. 200 sieve (silts and clays)

Hydrometer analysis uses Stokes' law sedimentation to size fines smaller than 0.075 mm that cannot be sieved practically.

A sedimentation basin treats 1 MGD and has a surface area of 1,000 ft². What is its overflow rate?

Answer: 1,000 gpd/ft²

Overflow rate = Q/A = 1,000,000 gpd ÷ 1,000 ft² = 1,000 gpd/ft².

If the Hazen-Williams C coefficient of a pipe drops because of aging and tuberculation, what happens at the same flow rate?

Answer: Head loss increases

A lower C means a rougher pipe, so friction head loss goes up for the same discharge.

A contractor proposes a different product than specified after award. Who generally bears the burden of proving equivalence?

Answer: The contractor

The party requesting the substitution must demonstrate the proposed product is equal to the specified one.

What does the Schedule Performance Index (SPI) indicate when it equals 0.85?

Answer: The project is behind schedule

An SPI less than 1.0 indicates the project is behind schedule, meaning less work has been completed than planned.

Which factor is most critical when designing a highway interchange?

Answer: Traffic flow analysis.

Traffic flow analysis is the most critical factor when designing a highway interchange because it determines the layout and capacity needed to handle vehicle movements safely and efficiently. Engineers analyze current and projected traffic volumes, turning movements, and speeds to minimize congestion, reduce conflict points, and ensure smooth transitions between roadways. This prevents bottlenecks and improves overall network performance and safety.

What is the purpose of a load-bearing wall in a structure?

Answer: Supports and transfers structural loads to the foundation.

A load-bearing wall is a critical structural element designed to carry the weight from the roof, floors, and other structural components above it. It effectively transfers these vertical loads down through its structure to the foundation, ensuring the stability and integrity of the entire building.

What is the approximate modulus of elasticity of structural aluminum alloys?

Answer: 10,000 ksi

Aluminum alloys have E ≈ 10,000 ksi, about one-third of steel's value.

ASTM C78 determines concrete flexural strength (modulus of rupture) using which loading arrangement?

Answer: Third-point loading

ASTM C78 uses third-point loading, creating a constant-moment region in the middle third of the beam.

What is the primary benefit of green infrastructure in urban water management?

Answer: Reduces runoff and enhances water infiltration.

Green infrastructure in urban water management utilizes natural systems, like rain gardens, permeable pavements, and green roofs, to manage stormwater. Its primary benefit is reducing impervious surfaces, which decreases stormwater runoff volume and velocity, thereby mitigating flooding. It also enhances natural water infiltration into the ground, recharging groundwater and filtering pollutants, leading to healthier urban environments.

According to the ASCE Code of Ethics, what must engineers hold paramount above all else?

Answer: The safety, health, and welfare of the public

ASCE's ethics code puts public safety, health, and welfare above all other obligations.