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WorksheetsPrestressed and Composite Structure
Total questions: 20
Worksheet time: 11mins
In this method the reinforcing steel is first prestressed and then the concrete is poured. When the concrete has developed strength, the stress in the steel is released.
Pre-tensioning or bonded prestressing.
Post-tensioning or unbonded pre-stressing.
Pre-Cast
Cast-In Place
In this method, tubes, conduits, or channels are inserted in the concrete where reinforcing steel is required.
Pre-tensioning or bonded prestressing.
Cast In Place
Pre Cast
Post-tensioning or unbonded pre-stressing.
It is a modern building method that is based in the combination of steel cross sections and reinforced concrete elements and is aimed at the maximum possible utilization of their properties to the benefit of the structure.
Conventional Construction
Composite Construction
Cast-In Place Construction
Pre-Engineered Buildings
Serves as a tensile reinforcement for the concrete slab to which it is bonded with embossed rib pattern.
Composite Decking
Form Decking
Cellular Decking
Metal Decking
is manufactured by welding a corrugated sheet to a flat steel sheet, forming a series of spaces or raceways for electrical and communications wiring; special cutouts are available for floor outlets. The decking may serve as an acoustic ceiling when the perforated cells are filled with glass fiber.
Metal Decking
Form Decking
Cellular Decking
Composite Decking
Serves as a permanent formwork for a reinforced concrete slab until the slab can support itself and its live load.
Form Decking
Composite Decking
Cellular Decking
Metal Decking
What is the minimum concrete mix grade required for a pre-tensioned system?
M40
M20
M30
M25
Which of the following is considered a disadvantage of using lightweight aggregates in prestressed concrete?
Higher self-weight of the structure
Higher usage of steel reinforcement
Higher loss of prestressing due to elastic deformation
Decreased durability of the structure
What is the main difference between the pre-tensioning and post-tensioning methods?
Pre-tensioning uses cables, while post-tensioning uses wires.
Pre-tensioning is done after the concrete hardens, while post-tensioning is done before.
Pre-tensioning is developed due to bonding, while post-tensioning is developed due to bearing.
Pre-tensioning is used for heavy elements, while post-tensioning is for small elements.
Who is referred to as the "Father of prestressed concrete"?
P.H. Jackson
Eugene Freyssinet
Gustave Magnel
Mullett
A "tendon" is defined as which of the following?
A single lengthy steel element
A combination of more than two wires
A group of strands or wires
A group of tendons
What property is concrete strong in and weak in?
Strong in tension, weak in compression
Strong in both tension and compression
Strong in compression, weak in tension
Weak in both tension and compression
Composite construction is described as a generic term for building construction that involves:
Multiple dissimilar materials
A single material
Concrete
Steel
In composite construction, what is the role of steel?
It provides protection against fire and corrosion.
It is efficient in compression.
It brings ductility into the structure.
It acts as a formwork during construction.
Which of the following is a function of the profiled steel decking in a composite slab?
It acts as a formwork during construction.
It provides fire protection for the concrete.
It reduces the ductility of the structure.
It replaces the need for mesh reinforcement.
What is the purpose of "shear connectors" in a composite beam?
To protect the steel from fire.
To connect the concrete slab to the profiled steel decking.
To achieve composite interaction by attaching the slab to the top flange of the beam.
To increase the steel beam's ductility.
Which of these is NOT one of the main composite elements?
Composite slab
Composite beam
Composite wall
Composite column
In a composite column, the steel section can be either encased in concrete or what?
Filled with concrete
Wrapped in a profiled steel decking
Protected by a shear stud
Placed beside a reinforced concrete section
A key advantage of composite construction over conventional concrete construction is:
It requires time-consuming shuttering.
It is less sensitive to tensile forces.
It has a higher ratio between bearing capacity and weight.
It is less accurate due to prefabrication.
The Millennium Tower in Vienna, a sample composite construction project, achieved a maximum erection speed of:
8 months total
2 to 2.5 storeys per week
55 storeys per month
145 million Euro
