Question 1

In a slab designation 3S4, the number 3 represents the ____.

Accepted Answer

In a slab designation like 3S4, the number before the letter (in this case, 3) typically represents the floor number on which the slab is located.

Question 2

A commonly used floor system in poured-in-place concrete, the ____ combines a thinner slab with concurrently poured joists or ribs to create a floor system very similar to a precast concrete double-tee system.

Accepted Answer

The one-way ribbed system combines a thinner slab with concurrently poured joists or ribs, creating a floor system similar to a precast concrete double-tee system. The one-way solid slab-and-beam system and the two-way solid slab-and-beam floor system both involve the use of beams and/or columns in addition to the slab, while the two-way flat-plate floor system is made up of a flat, thick concrete slab reinforced with steel.

Question 3

The ____ used with poured- in-place concrete floor systems consist of a plan view of the floor, sections, slab schedules, and notes.

Accepted Answer

Engineering drawings are used with poured-in-place concrete floor systems because they provide a plan view of the floor, sections, slab schedules, and notes.

Question 4

The ____ is a poured-in-place concrete floor system consisting of a thick slab with a series of geometric recesses formed into it.

Accepted Answer

The description matches that of a waffle-slab floor system. The other options have different configurations that do not match the description.

Question 5

Name the two classifications of poured-in-place concrete floor systems.

Accepted Answer

The answer of Name the two classifications of poured-in-place concrete...

Question 6

Stairs provide easy access between the floors of a building; one type, ____, have two turns and two landings.

Accepted Answer

Double-L stairs have two turns and two landings, making them distinct from the other types listed.

Question 7

The absence of beams and girders and the flat floor make the ____ an ideal poured-in-place concrete floor system in applications where headroom is a problem.

Accepted Answer

The absence of beams and girders and the flat floor are characteristics of a two-way flat-plate floor system. This type of system is ideal for applications where headroom is a problem because it eliminates the need for bulky structural elements that would reduce the floor-to-ceiling height. The other options (waffle-slab system, joist slab system, and one-way ribbed system) all involve some form of beams or ribs that would not be as suitable for low-ceilinged spaces.

Question 8

The ____ used with poured- in-place concrete floor systems contain a plan view of the floor, sections showing precise placement of the reinforcement bars, a slab schedule, and a bar details schedule

Accepted Answer

Placing drawings are specifically used with poured-in-place concrete floor systems and contain detailed information on reinforcement bar placement and schedules. Engineering drawings may include placing drawings, but they also cover other aspects of a building's construction. Slab drawings and floor grid drawings may be part of placing drawings but do not encompass all the necessary information.

Question 9

In stair design, all ____ are the same height.

Accepted Answer

Risers are the vertical parts between each tread on a staircase. In order for a staircase to be safe and comfortable to use, all risers must be the same height.

Question 10

One of the most commonly used floor systems in poured-in-place concrete is the ____, which consists of a 4" to 6" thick slab of concrete supported by parallel beams or walls.

Accepted Answer

The one-way solid slab-and-beam system consists of a slab of concrete, typically 4" to 6" thick, supported by parallel beams or walls, making it a common choice for poured-in-place concrete floor systems.

Question 11

In a ____, lateral stability may be increased by adding bridging at intervals between the joists or ribs.

Accepted Answer

In a one-way ribbed system, lateral stability can be enhanced by adding bridging between the joists or ribs. This system relies on the directional strength of ribs running in one direction, and bridging helps distribute loads and increase stability.

Question 12

A commonly used floor system in poured-in-place concrete, the ____ has beams running in two directions and is reinforced in two directions.

Accepted Answer

The two-way solid slab-and-beam floor system has beams running in two directions and is reinforced in two directions, which makes it a commonly used floor system in poured-in-place concrete. The other options do not fit this description. The joist slab system has beams running in one direction, the waffle-slab system has a grid pattern of voids or holes in the slab, and the two-way flat-plate floor system has no beams.

Question 13

____ are slightly sloped passages that serve the same purpose as stairs in that they provide access from one elevation in a building to another.

Accepted Answer

Ramps are the only option that specifically refers to a sloped passage designed for access between elevations, whereas the other choices may have other meanings or applications.

Question 14

One critical dimension required in designing stairs, ____, is the distance from one floor to the next or, in other words, the height that the stairs must span.

Accepted Answer

The distance from one floor to the next is referred to as the "total rise" in stair design terminology. This is a critical dimension required in designing stairs as it determines the required number of steps and the height of each individual step. Incorrect choices would be x-distance or floor span, which do not accurately describe the dimension required for designing stairs, and stair elevation, which may be a related concept but does not specifically refer to the height that the stairs must span.

Question 15

What is the computational connection between risers and treads?

Accepted Answer

The computational connection between risers and treads can be found through the formula of the stair ratio. The stair ratio is the sum of twice the rise height and the going (tread) depth in inches, which should be between 24-25 inches. Using this formula, we can determine that the number of risers is one more than the number of treads. Therefore, the best choice is D.

Question 16

In stair design, all ____ are the same width.

Accepted Answer

Treads are the horizontal surface of each stair step and are the same width to provide consistent footing and prevent tripping. The vertical portion of each step, called the riser, can vary in height. Spans refer to the distance between supports, which is not relevant to the width of individual steps in stair design.

Question 17

Stairs provide easy access between the floors of a building; one type, ____, have one 90-degree turn between elevations and the two sides pf the L are connected by a landing.

Accepted Answer

L-shaped stairs have one 90-degree turn between elevations and the two sides of the L are connected by a landing.

Question 18

Stairs provide easy access between the floors of a building; one type, ____, run straight from one elevation to the next with no turns.

Accepted Answer

Straight stairs run in a straight line from one floor to the next, with no turns or landings.

Question 19

Stairs provide easy access between the floors of a building; one type, ____, traverse part of the distance between floors, usually half, in one direction and traverse the remaining distance in the opposite direction.

Accepted Answer

U-shaped stairs, also known as switchback stairs, are designed to make a 180-degree turn, traversing part of the distance in one direction and the remaining distance in the opposite direction.

Question 20

One critical dimension required in designing stairs, ____, is the horizontal distance the stairs cover.

Accepted Answer

The horizontal distance covered by the stairs is known as the total run, and it is a critical dimension required in designing stairs. The total run determines the overall length of the stairs and affects the rise, tread, and other design elements, making it a crucial factor in ensuring safe and comfortable stairs. Choices B, C, and D are not as commonly used or relevant in stair design as the total run.

Quiz 2: Structural Poured-In-Place Concrete