Clear Cover and Nominal Cover used for RCC Structure

The concept of Clear cover and nominal cover is seen in the Reinforced concrete structures.

Reinforced concrete structures have been main structural materials for over a century and still the most popular material for public structures all over the world. The concrete structure is durable enough to keep its shape for a long time.

The reinforced concrete structure refers to the members like beams, boards, columns, and roof trusses etc. which are consisted of concrete and steel bars.

In these structures, the steel bars are covered by concrete but their mechanical properties will still lose due to the fire to destroy the whole structure.

In this design of reinforced concrete structures, the provided reinforced is inserted in the concrete upto a particular distance from the face of the member as there are some reasons.

The reasons are discussed below:

• It will provide protection to reinforcement from erosion
• It will also provide fire resilience to reinforcement.
​• It will also supply sufficient embedded depth so that reinforcement grows the requisite stress.

This distance is measured in various ways and known by different names like:

• Clear cover: This is the difference from the face of the member to the outermost face of the reinforcement including shear or torsion Stirrups or links.
• Nominal cover: This cover is like the same as Clear Cover although it has different name; actually the name is a term that is used by the code. It is the distance measured from the face of the member to the outermost face of the reinforcement including Stirrups or links.

To get information on other clear cover and nominal cover, go through this useful civil engineering video tutorial.

Video Source: CE&T-Civil Engg & Technology

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Published By
Rajib Dey
www.constructioncost.co
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Various Types of Prefab Roof Trusses

Now-a-days manufactured roof trusses are used extensively for new homes in USA to form the roof. In traditional framing, the rafters and ceiling joists are used and these are replaced in prefabricated trusses. The trusses are utilized to facilitate the general contractor for building homes which contain more complicated roof and ceiling designs maintaining superior speed and precision.

Fewer unskilled carpenters are employed to build the trusses by incurring low labor costs. These cost savings will minimize the price of almost any new home to be developed. Therefore, prefabricated trusses are mostly suitable for modern builders for their bottom line as compared to traditional roof framing.

Benefits of Prefabricated Trusses

• Trusses extent longer distances and disregard the requirement for inside load bearing walls.
• Cost effective as compared to stick roof framing as they are created with shorter lengths containing two by four stock as contrary to the larger framing members associated with traditional rafter and ceiling framing.
• Trusses are specially created for almost any ceiling or roof combination essential for modern custom homes.
• The proficient engineers design these trusses to satisfy the roof load and building code requirements.
• Trusses can generally be formed in one day. Therefore, the construction time minimized significantly. The inside of the new home is uncovered outside weather conditions.
• Inexperienced carpenters will also be able to construct trusses and less labor costs are required.

The Common Roof Truss

The common truss is acknowledged by its triangular shape and will frame the bulk of any new home truss package. Common trusses include seven primary portions as below:-

Top chord - To which the roof sheathing is used.

Bottom chord - To which the drywall or other finished ceiling is associated.

Bearing point - Where the common truss is created to be placed on the outside bearing walls.

Web supports – These are used to retain the top chord in the exact position, at intermediary points from the highest to the bearing point.

King post - It is applied to facilitate support to the heighest or top of the common truss.

Metal gussets – These are applied where the web supports and king post overlap the top and bottom chord and at the bearing point.

Tail of the truss is applied to produce the eave or overhang and arranges a way to assign soffit and fascia.

To read the complete article visit, www.carpentry-pro-framer.com

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Published By

Rajib Dey

www.constructioncost.co

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