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Friday, May 26, 2017

Brief demonstration on counterfort retaining wall

This construction video is the part 2 series of retaining wall design. In this video, you will learn various aspects of counterfort retaining wall along with the details of stability checks.
The video includes brief calculation made for cantilever and counterfort wall.
In the counterfort retaining wall, the step and the base slab are connected unitedly with counterforts at proper gaps.

As a consequence of provision of counterforts, the vertical stem together with the heel slab performs as continuous slab, contrary to the cantilevers of cantilever retaining wall.


They are inexpensive for height in excess of about 6 m.


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Published By
Rajib Dey
www.constructioncost.co

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Thursday, May 25, 2017

How to design and find out the size of rectangular open channel in Hydraulic Engineering

This construction video provides some useful tricks on how to design or find out the most economical segment toward rectangular open channel.
Open Channel Flow is described as fluid flow containing a free surface open to the atmosphere. The instances are streams, rivers and culverts not flowing full.
The video provides solution to the following problem :-
problem:--Find the most economical X-section of a rectangular channel to carry 0.3𝑚^3/sec of water when channel bed slope is 1:1000. assume chezy’s constant, C=60
In the solution provided, chezy’s formula as well as some condition of economical section is applied to obtain the size of the channel.
The Chezy formula is applicable to pipes having turbulent flow. In fluid dynamics, the Chézy formula defines the mean flow velocity of steady, turbulent open channel flow.
The formula is given as How to design and find out the size of rectangular open channel in Hydraulic Engineering

• {\displaystyle v=C{\sqrt {R\,i}},\,}where
• {\displaystyle v}ν denotes average velocity [m/s],
• {\displaystyle C}C denotes Chezy's coefficient [m½/s],
• {\displaystyle R}R is the hydraulic radius (~ water depth) [m], and
• {\displaystyle i}i is the bottom slope [m/m].

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Published By
Rajib Dey
www.constructioncost.co

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Wednesday, May 24, 2017

Overview of Peikko DSA Punching Reinforcement System for Cast-in-Place Concrete

This construction video tutorial provides the demonstration Peikko DSA Punching Reinforcement. It belongs to a Transverse Reinforcement System for Cast-in-Place Concrete. It is specifically designed to improve the strength of punching shear concerning elevated concrete slabs and slabs on grade devoid of raising their thickness.

DSA rails consist of steel double-headed DSA Studs welded to a steel shape. The steel shape ensures the exact spacing and placing of the studs throughout their set up in concrete as per ASTM-A1044 standard. It should be used for both top and bottom installation.
Peikko DSA Punching Reinforcement offers an easy and consistent solution toward punching and shear failure which may happen in elevated concrete slabs, slabs on grade and footings.
If DSA Punching Reinforcement is applied in elevated slabs like reinforced concrete slabs or post-tensioned slabs, DSA Punching Reinforcement system disregards the requirement for column capitals. Therefore, forming and concrete costs are minimized significantly.
DSA reinforced cast-in-place elevated slabs are designed slimmer to minimize the entire construction height. It leads to huge savings in construction and running costs. The DSA system also provides a ceiling with uninterrupted clearance facilitating adaptability and simplicity of planning and installation of building services.
The fabrication process for DSA studs is done with low carbon steel grades C1010 through C1020. DSA Punching Reinforcement system adheres to the standard specification for steel stud assemblies for the shear reinforcement of concrete ASTM A-1044. It should be designed according to ACI 318-14 and CSA A23.3-14 which make it relevant in North America and Middle East.
Punching Reinforcement systems are also employed in foundations to curtail the thickness of footings, pile caps and slabs on grade. Other applications range from DSA rails are utilized as shear reinforcement in beams, walls and other concrete elements.


To get more information, click on the following link. www.peikkousa.com

Overview of Peikko DSA Punching Reinforcement System for Cast-in-Place Concrete

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Published By
Rajib Dey
www.constructioncost.co
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Tuesday, May 23, 2017

Variation among pad foundation, strip foundation and raft foundation

Shallow foundation is generally described as foundation that contains founding level below 3m from ground surface. Alternatively, when the breadth of the lower most part of the foundation is more than the depth of the lower most part of the foundation from the uppermost of the soil, i.e. Ground Level then it is defined as a Shallow Foundation. It transmits building loads to the earth adjacent to the surface. Shallow foundations comprise of spread footing foundations, mat-slab foundations, slab-on-grade foundations, pad foundations, rubble trench foundations and earthbag foundations.

Pad foundation stands for the foundation that is specifically developed for retaining concentrated loads out of a single point load like structural columns. Pad foundations are specifically designed to provide support to individual or multiple columns, scattering the load to the ground underneath. They are usually square or rectangular in plan, the plan area is defined by the allowable bearing pressure of the soil. The shape in plan will be determined by the arrangement of the columns and the load will be transmitted into the soil.
The thickness of the slab should be adequate to make sure that distribution of the load is perfect. The top of the pad should have been sloping (i.e. the pad is denser in the centre as compared to it is at the edge). It provides a cost-effective solution, though there are construction issues which are associated with casting the slope.

Strip foundation is utilized to provide support to a line of loads like load-bearing walls. As for example, closely-placed columns deliver the imperfect application of pad foundation and strip foundation may be a good choice.
Raft foundation comprises of a concrete slab which expands over the entire loaded area in order that loads from whole structure are expanded over a broader area that results in minimizing of the stress of foundation soils. Besides, raft foundation is useful for resisting differential settlement.



Variation among pad foundation, strip foundation and raft foundation

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Published By
Rajib Dey
www.constructioncost.co
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Monday, May 22, 2017

Various aspects of Design Loads

This construction video is recorded on design loads. Design loads are essential while designing any building or civil structure. One can learn types of design loads and it’s various categories. You will also be familiar with dead loads values with adherence to the IS code 875-1987 part-1.

In architecture and engineering term, design load stands for the highest amount of stress that a structure has to withstand. Weight is one of the most important factors that should be taken into consideration for making calculation. Beside, weight, design load calculations should also include other types of forces that a structure has to undergo.

As for instance, bridges and tall buildings should have the capability to withstand strong winds as well as supporting their own weight along with the weight of people and objects that are on them or within them.


Perfect calculation of design load is very important to ensure that a structure is secured. If the design load is not computed, stability of structures, or even segments of structures, can be hampered. Unstable structure may collapse which can be deadly.


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Published By
Rajib Dey
www.constructioncost.co

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Saturday, May 20, 2017

Some useful construction tips to provide clear cover for reinforced concrete structure

This construction video tutorial will provide detailed guidelines on how to provide perfect clear cover in reinforcement concrete structure.
With the intension of safeguarding the reinforcement from corrosion as well as arranging fire resistance to bars implanted in concrete, clear cover is set for Reinforced Concrete Structures.
Clear cover stands for the distance among C.G of reinforcement bars and bottom most point of concrete.
The thickness of cover is dependent on ecological conditions and nature of structural member.
The depth of concrete cover is calculated by applying a cover meter.
The clear cover that should be provided is determined by Indian Standards. IS 456:2000.

Watch following youtube video to learn the complete process :-


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Published By
Rajib Dey
www.constructioncost.co

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Friday, May 19, 2017

Analysis and Design of Concrete Retaining Wall

Concrete Retaining Wall Design: Before starting, initially, we should verify the constancy of the retaining wall. Besides, verification should be done for overturning and sliding prior to continue with the design.
The bearing under the foundation should also be examined. If the soil provides support to the wall, bearing pressure below the foundation of wall shall be under the acceptable bearing capacity.
To start with, you should inspect the retaining wall and determine the bending moments and shear forces with the use of an analysis software like SAP2000 or PROKON or any other software or with calculations by hand. If there are dissimilarities like steps in the retaining wall and the emphasis is given on stress variation of the wall, you can utilize software like SAP2000 or ANSIS.
Calculations by hand can be performed for basic retaining walls which do not contain lots of complications. As for instance, cantilever retaining wall is examined by making its behavior simple. You can imagine the boundary condition "fixed" at base to get the bending moments and shear forces of the wall. Once the wall forces are detected, you can get the forces of the base of the wall. The most suitable process will be applying a software to locate the bending moments and shear forces.

To know about the complete process, click on the following link. structuraldesignbs.blogspot.in

Analysis and Design of Concrete Retaining Wall

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Published By
Rajib Dey
www.constructioncost.co
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