Post/Precast concrete structural units - ENGINEERING ASSIGNMENT

1.      Columns and beams are examples of precast concrete structural units.  List five (5) more examples of precast concrete structural units.

Precast concrete structural units are described by unit's stack that are laid in vertical or horizontal units. Notwithstanding beams and columns, other imperative cases of precast structural units include:  Stairs, Double Tees, Wall Panels, Solid Slabs, Modular Units, and Piles.

2.      How do non-pre-stressed structural units differ from pre-tensioned units?

Structural units categorized as Non-pre-stressed are not quite the same as pre-tensioned units as far as the amount of burden they can support, usage and low compass to-profundity proportion. Steel consumption is altogether lessened in pre-tensioned solid units; they have expanded sturdiness and the full area can be used. Aside from that, pre-tensioned units have higher solidness and enhanced serviceability. Pre-stressing makes bigger compasses conceivable recognizably for structures using huge column-free spaces.

3.      What is camber as it relates to non-pre stressed and pre tensioned?

Pre-stressed concrete units get bended upward when subjected to outside use of low loads. This upward avoidance is known as 'camber'. Camber may shift with time with stress dissemination over the heaps.

4.      How much camber does a non-pre stressed beam develop?

Camber values of non-pre-stressed beams develop in multiples of 1.4.

5.      What are the five (5) commonly used types of pre stressed floor and roof slabs?

Pre-stressed floor and roof slabs are produced in factory and are accessible in the accompanying choices:

1. Hollowcore units
2. Beam and block slabs
3. Solid concrete slabs
4. Leca Planks
5. Double Tees

6.      Which type of precast pretensioned slabs span the greatest distances?

Double T slabs are generally the longest slabs made of precast pre-tensioned cement. Their length fluctuates from 8 to 32 meters.

7.      What is the main value in pre-stressing precast concrete columns?

The height of precast concrete column is its main value in pre-stressing.

8.      What is the difference between post-tensioning and pre-tensioning?

Pre-Tensioning	Post-Tensioning
1. Pre-tensioned concrete is made using: Stressing the tendons and casting the concrete around them. 2. Tendons are discharged once the concrete is hard. 3. Pre-tensioned concrete consume more cost. 4. Diminished serviceability.	1. Tendons are stressed and secured in the wake of casting the cement. The concrete needs to accomplish a sufficient quality with a specific end goal to support the pre-stress power. 2. Concrete is settled around the tendons and permitted to set till it procures the obliged quality. 3. Post-tensioned concrete consume less cost. 4. Expanded serviceability.

9.      List a minimum of six (6) advantages of using precast concrete structural members over concrete cast-in-place construction according to your text. 

Here are the key advantages of utilizing precast concrete structural units:

1. Diminished development cost
2. More thinner slabs
3. Longer compass length prompting expanded ease of use for building and stopping structures
4. Lower support cost because of less joints.
5. Expanded quality control
6. Huge lessening in formwork

10.  According to your text, what are the four types of connections for precast units?

There are four main types of connections for precast units, include beam end connections, bolted connections, dowel/anchor bolt connections and welded connections.

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