Building Construction Chapters 8-10 Quiz

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Questions and Answers

What is the purpose of installing a temporary horizontal wood brace during column construction?

  • To provide aesthetic support for the forms
  • To facilitate easier removal of the column forms
  • To secure the reinforcement bars in place (correct)
  • To enhance the insulation of the column

Which step is NOT required before closing the column forms?

  • Ensure all accessories are installed
  • Check the installation of downspouts and conduits
  • Verify the vertical position of reinforcement
  • Install a decorative finish on the forms (correct)

How does the simultaneous concreting of columns and walls optimize the construction process?

  • By eliminating the need for reinforcing bars
  • By reducing the amount of construction labor needed
  • By allowing continuous horizontal bars across column reinforcement (correct)
  • By requiring more elaborate formwork sets

What is a key characteristic of a spiral column?

<p>It features a circular concrete core enclosed by spirals (C)</p> Signup and view all the answers

What is the recommended action if different concrete mixes are used for columns and walls during construction?

<p>Always pour the column first to ensure strength (D)</p> Signup and view all the answers

What is a potential issue to avoid during the installation of column forms?

<p>Using insufficient bracing to secure the forms (A)</p> Signup and view all the answers

What is the main advantage of using galvanized wire or machine bolts for bracing column forms?

<p>They ensure secure support before concrete pouring (D)</p> Signup and view all the answers

What type of beam is supported on one end with the other end projecting beyond the support?

<p>Cantilever Beam (D)</p> Signup and view all the answers

Which of the following describes a Simple Beam?

<p>Supported at its ends without a restraint at the supports (C)</p> Signup and view all the answers

What is the primary purpose of a girder in a structure?

<p>To act as a primary beam supporting smaller beams (C)</p> Signup and view all the answers

Which of the following statements best defines stress in materials?

<p>An internal action set up between adjacent molecules when acted upon by forces (B)</p> Signup and view all the answers

What characterizes a T-Beam in construction?

<p>It is formed when floor slabs and beams are poured simultaneously (A)</p> Signup and view all the answers

How does the design influence building materials in a structure?

<p>It determines size, quantity, quality, spacing, proportions, and mixture of materials (C)</p> Signup and view all the answers

What effect do external forces have on a structure?

<p>They can cause adjacent sections to experience shear (B)</p> Signup and view all the answers

In the context of beams, what is meant by a Continuous Beam?

<p>A beam that rests on more than two supports (A)</p> Signup and view all the answers

Which type of stress results from a structure being pulled apart?

<p>Tensile Stress (A)</p> Signup and view all the answers

What type of load is a dead load characterized as?

<p>Fixed and stable (B)</p> Signup and view all the answers

Which of the following loads is considered an environmental load?

<p>Wind pressure (B)</p> Signup and view all the answers

What is the effect of a gravitational force on a homogeneous concrete beam?

<p>It causes the beam to sag or bend downward. (A)</p> Signup and view all the answers

In terms of bending moments, what occurs when a beam bends downward?

<p>Positive bending is created. (A)</p> Signup and view all the answers

Which type of load is related to the occupancy of a structure?

<p>Live Load (C)</p> Signup and view all the answers

What distinguishes shear stress from other types of stress?

<p>It acts parallel to the cross-section of the material. (A)</p> Signup and view all the answers

When describing concentrated loads, which statement is accurate?

<p>They can be fixed or variable in position. (A)</p> Signup and view all the answers

Which method of connecting structural steels involves the use of a heated fastener?

<p>Rivets (A)</p> Signup and view all the answers

What is the recommended diameter for punching a hole for a 19 mm rivet?

<p>22 mm (B)</p> Signup and view all the answers

What happens to the rivet shank during the installation process?

<p>It is deformed to form the head. (D)</p> Signup and view all the answers

What is a common failure mode for rivets due to force applied across the joint?

<p>Tension (D)</p> Signup and view all the answers

Which of the following is NOT a method of connecting structural steels?

<p>Nails (A)</p> Signup and view all the answers

When installing rivets, what should be ensured about the holes in the connected plates?

<p>They must be slightly larger than the rivet diameter. (D)</p> Signup and view all the answers

What type of tools are primarily used to install rivets?

<p>Power riveters (A)</p> Signup and view all the answers

What factor influences the size of rivets chosen for a project?

<p>Thickness of materials to be connected (D)</p> Signup and view all the answers

What is the primary purpose of an Open Web Steel Joist?

<p>To create a lightweight structure for supporting floors and panels. (A)</p> Signup and view all the answers

Which type of truss is classified as the most economical for covering a wide span?

<p>Roof trusses (D)</p> Signup and view all the answers

What are purlins primarily used for in a roofing structure?

<p>To transfer roof loads to the truss at panel points. (D)</p> Signup and view all the answers

Which of the following is NOT a type of welded joint?

<p>Corner Joint (A)</p> Signup and view all the answers

Which of the following welding techniques is most preferred in structural steel connections?

<p>Arc welding (B)</p> Signup and view all the answers

What does the term 'penetration' refer to in welding?

<p>The depth where fusion ceases from the original surface. (A)</p> Signup and view all the answers

What diameter do sag rods usually have in a typical roofing structure?

<p>16 mm or 19 mm (D)</p> Signup and view all the answers

Which of the following types of trusses is NOT typically used in construction?

<p>Cable Truss (B)</p> Signup and view all the answers

What is the primary purpose of placing additional straight reinforcing bars on the top of a beam?

<p>To enhance resistance against bending moments near supports (C)</p> Signup and view all the answers

What is a recommended minimum clear distance between main reinforcing bars?

<p>2.5 cm (B)</p> Signup and view all the answers

What is the consequence of using lap splices on bars larger than No. 11 or 35 mm in diameter?

<p>They could lead to structural failure (A)</p> Signup and view all the answers

Why is staggering splices necessary in high-stress areas?

<p>To promote even load distribution (D)</p> Signup and view all the answers

What is a disadvantage of using bent bars in beam design?

<p>Bent bars require more skilled labor for installation (A)</p> Signup and view all the answers

What is the preferred number of bars to use for main reinforcement when bent-up bars are needed?

<p>An even number of bars for balance (D)</p> Signup and view all the answers

What is the maximum distance that protective covering for steel bars must extend from the face of the beam?

<p>4 cm (B)</p> Signup and view all the answers

How should bundled bars be spliced according to the guidelines?

<p>Individually with non-overlapping lap lengths (B)</p> Signup and view all the answers

Flashcards

Beam

A structural member designed to support transverse loads primarily resting on supports at its ends.

Girder

A type of beam supporting multiple smaller beams.

Simple Beam

A beam supported at both ends, free to rotate, without any restraints.

Restraint

A fixed or rigid connection that restricts movement at the support.

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Continuous Beam

A beam supported at more than two points, allowing for continuous distribution of load.

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Semi-Continuous Beam

A special type of beam with two spans, potentially with restraints at the ends. It's similar to a continuous beam but with a specific configuration.

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Cantilever Beam

A beam supported at one end, with the other end projecting outwards.

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T-Beam

A special type of beam formed by combining a slab and a beam, where the slab acts as the flange and the beam acts as the web.

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Temporary Brace for Column Installation

A temporary horizontal wood brace supporting the bars before column form installation, ensuring stability and alignment.

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Verifying Reinforcement and Side Form Installation

Checking the column reinforcement's vertical position and installing the form's sides to ensure correct alignment.

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PreInstalling Accessories before Form Closure

Installing accessories such as downspouts, conduits, and plumbing before the finalization of the column forms.

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Wider Form Cover Installation

Securing the wider form cover using charcoal marks and nails to guide proper size and alignment of the column form.

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Concreting Columns after Wall Laying

A method where the wall footing is constructed first, followed by wall reinforcement and block laying. The column reinforcement is left vacant, and the column is poured later.

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Installing Pipes in Column Space

Installing necessary pipes for accessories in the designated column space before pouring the column concrete mix.

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Cleaning Column Space Before Form Installation

Cleaning the column space from debris followed by thorough washing before installing the column forms.

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Simultaneous Concreting of Columns and Walls

A method where columns and walls are poured simultaneously, improving structural bonding and eliminating the need for horizontal dowels. The column is supported by the surrounding walls, making the process easier, faster, and more economical.

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Compressive Stress

The force that tries to compress or squeeze a material, making it shorter.

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Tensile Stress

The force that tries to stretch or pull a material, making it longer.

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Shear Stress

The force that tries to slide or shear a material, causing it to deform.

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Torsional Stress

The force that tries to twist a material, causing it to rotate.

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Dead Load

The weight of the structure itself, which is always present and cannot be removed.

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Live Load

The weight of people, furniture, and other items that may or may not be present in the structure.

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Environmental Load

Forces caused by wind, rain, snow, earthquakes, and temperature changes.

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Bending Moment

A force that tends to cause rotation about a specific point or axis.

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Open Web Steel Joist

A lightweight structure used to support floors and panels between main supports.

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Roof Truss

The most economical way to cover a building with a wide span.

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Types of Roof Trusses

Different types of roof trusses include King post, Simple Fink, Fink, Howe, Pratt, Fan, Single-span Fink, Clipped, Rigid frame open-web clear span, Rigid frame clear span, Single span slope beam, and Continuous Beam.

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Purlin

A beam placed on top of rafters or the top chord of a truss, transferring the roof load to the truss at panel pints.

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Roof Panel

The portion of the roof between two adjacent joints of the upper chord.

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Sag Rod

A steel bar attached to the center or endpoints of the purlin span to prevent sagging.

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Arc Welding

A type of welding where the weld metal and base metal fuse together, achieving full penetration.

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Butt Joint

A type of joint where two pieces of metal are joined end to end.

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Rivet

A metal fastener used to join two or more pieces of material together by deforming its shank to form a head. It is often used in structural applications where a permanent connection is required.

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Bolt

A fastener used to connect two or more pieces of material together with a screw thread. It is often used in applications where a reusable connection is required.

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Riveting

The process of heating a rivet to a specific temperature to make it malleable and ready for installation.

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Hole alignment

The process of aligning the holes in two or more pieces of material before installing rivets.

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Bucking-up tool

A tool used to apply pressure to the rivet head, drawing the connected materials tightly together during the riveting process.

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Riveter

The process of using a power riveter that delivers rapid blows to deform the shank of a rivet and form the head.

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Rivet Size

The diameter of a rivet, which is determined by the application and material thickness.

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Rivet Strength

The strength that a rivet can transfer across the joint it connects, influenced by its size and material properties.

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No Bent Bars Reinforcement

A method of reinforcing beams where straight bars are used instead of bent bars. It involves placing extra straight bars at the top and bottom of the beam to resist bending forces. This method is simpler but less effective in resisting tension and shear stresses.

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Straight Bars Extension in No Bent Bars

In beams reinforced using No Bent Bars method, additional straight bars are extended at the top of the beam beyond the support, typically to a distance of 1/3 of the beam span length. These bars help distribute loads more evenly.

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Straight Bars at Beam Center

In the No Bent Bars method, additional straight bars are placed at the bottom center of the beam span, where positive bending moments occur. These bars resist the upward forces.

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Minimum Spacing of Reinforcing Bars

The distance between main reinforcing bars in a beam should be at least 2.5 cm or 1 1/3 times the largest gravel size used in the concrete mix. This spacing allows for proper concrete flow and prevents overcrowding of bars.

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Spacing of Multiple Bar Layers

When using multiple layers of reinforcing bars in a beam, the clear distance between layers should be at least 3 cm. This allows for proper concrete placement and prevents bonding issues between layers.

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Splicing of Reinforcement

Splicing of reinforcement bars, connecting two bars together, is permitted in some cases according to ACI Code. However, it should only be done according to design plans or with approval from the engineer.

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Lap Splicing Restrictions

Lap splicing, a common method of connecting bars, is not allowed for bars larger than No. 11 or 35 mm in diameter. This restriction is due to the limitations of lap splicing in handling larger bars.

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Hooks and Bends Requirements

ACI Code outlines specific requirements for hooks and bends in reinforcing bars, which are crucial for securing bars within the concrete. These requirements ensure proper anchorage and load transfer.

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Study Notes

Building Construction (Chapters 8, 9, and 10)

  • The presentation covers building construction, specifically focusing on Chapters 8, 9, and 10.
  • The presenters are Adriosula, Anico, Artates, Girona, Isada, and Papa.
  • The presenter's guide is by Max Fajardo.

Chapter 8: Post and Columns

  • Definitions:
    • Post: A vertical timber or metal support not continuous from story to story. Its shape can be cylindrical, square, or other geometric forms.
    • Column: A vertical structure, made of stone, concrete, steel, or a combination of these, to bear loads.
    • Storey: A space between floor levels or a floor and roof.
  • Wooden Post:
    • Made traditionally from high-quality lumber from the first or second group for strength and durability.
    • Treated lumber is used when hardwood is lacking.
    • Potentially needs bracing and support during construction to avoid damage to the foundation.
    • Drawbacks in commercial lumber include inferior quality from younger trees, hardwood scarcity making durable materials difficult to find, susceptibility to decay from moisture, insects, worms, and termites, as well as cracks between wooden posts and concrete walls.
    • Erecting wooden posts demands precision and appropriate techniques to ensure stability and durability. The steps include dressing and cutting the bottom, marking for vertical alignment, marking girder and girt attachment points, erecting the post with braces or rope and pulley, checking vertical alignment using a plumb bob, nailing to a post strap, and bolting the post into its permanent position.
  • Reinforced Concrete Columns:
    • The most common material for columns today, regardless of size or height.
    • Materials include concrete, steel reinforcement (rebar), binding wire, formwork, and admixtures.
    • Classified as short or long columns based on the ratio of unsupported height to the shortest lateral dimension of the cross-section.

Chapter 9: Platform-Floor Structure

  • Wood Floor System:
    • The floor framing, or platform, part of a building that's supported by posts, columns, and beams, has advanced due to improvements in machinery and sawing techniques, which introduced structural lumber in various standard sizes allowing for assembly on site.
    • Design considerations include live loads (movable – people, furniture), dead load (static load of materials carrying the live load), construction material choice (e.g., lumber, concrete, steel), and the sizing and spacing of structural members, as well as spans between supporting walls.
    • Common types of wood floor framing include plank and beam, panelized, and conventional.

Chapter 10: Steel Framing

  • Introduction:
    • The method of steel framing's usage in construction dates back to the Greek and Egyptian civilizations.
    • Modern prefab approaches include pre-cut steel posts, beams and foundations using polyvinyl fluoride film for sheathing and siding, and vinyl-finished interior wall boards and complete factory-assembled flooring. Reinforced plastic showers and roofs are also components of these prefabricated materials
  • Structural Shapes:
    • Common structural steel shapes include square, round, plate, and angle bars, channels, I-beams, tee, H-column, wide flange, and zee.
  • Structural Steel Grades:
    • ASTM A7 is no longer a standard structural steel type, though structural steel ASTM A36 is more common
    • Newer steel grades, such as ASTM A36, A373, A440, A441, and A242 (high-strength structural grades) are available. ASTM A36 is stronger than A7 but easier to weld.
  • Fasteners (rivets and bolts):
    • Rivets and bolts are used for connecting structural steel; classifications of the most common types include ASTM A141, ASTM A195, and ASTM A406.
    • Methods for installation include drilling, heating rivets for insertion and using tools to shape the rivets for a secure connection.
  • Connections of Structural Members:
    • Column base plates: Spreading column load to foundation, proper plate sizing for load distribution, using plates for column attachment.
    • Column splices: Joining columns using riveted or welded splice plates for load transfer and alignment.
    • Beam bearing plates: Providing support for uniformly distributed beam loads using plates that are usually not riveted or welded to the beam flange.
    • Beam connections to columns: Varying connection methods to columns using different angles. Seat connections are common with stiffeners for larger beams and clip plate angles for beam connections to columns with smaller reactions.
    • Plate girders: Alternative to rolled steel section for greater span requirements, plate girders are built up from steel plates and angles connected using rivets or welding in I-shaped or box designs
    • Web plates and intermediate stiffeners: Requirements for web plate thickness, intermediate stiffener spacing in plate girder designs for preventing buckling, and other design considerations.
    • Roof trusses: A basic framework design suitable for wide-span support. Different truss types exist, each with its own unique configuration.
    • Purlins: Beams on rafters supporting the load of the roof to the truss at panel points.

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