Design of Flat Plate Slab [pdf]

Structural Concrete Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. The slab may be supported by walls, by reinforced concrete beams usually cast monolithically with the slab, by structural steel beams, by columns, or by the ground. The depth of a slab is usually very small compared to its span.

To read more about slabs, definition, classification, comparison of different types of one-way and two way slabs go here >>> Click here to read more about slabs

The design I am going to share with you today is Design of Flat Plate Slab as by definition;

Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. 

This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement.

Features of the design

This flat plate slab design is hand written involving each step by step detailed calculation with drawings and detailing. 

Steps involved in Design of Flat Plate Slab

• Load Calculation
• Total Factored Static Moment
• Limitations of DDM
• Longitudinal Distribution of Moments
• Torsional Constant C
• Transverse Distribution of Longitudinal Moments
• Design of Slab Thickness and Reinforcement
• Shear Design
• Design of Columns
• Design of Shear Head Reinforcement

Preview of the Design of Flat Plate Slab

So Here is the simple Preview of the flat plate slab design:

Download flat plate slab Design with Details

Now enjoy the fast one click flat plate slab design for free, click any of the link below;

Download Flat Plate Slab Design [pdf] Free

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Online Design of T-Beam, Reinforced Concrete Design in one Click Online.

Reinforced Concrete Floor systems normally consist of slabs and beams that are placed monolithic-ally. As a result, the two parts act together to resist loads. In effect, the beams have extra width's on their tops, called flanges and the resulting T-shaped beams are called T-beams. The part of a T Beam below the slab is referred to as the web or stem. The beams may be L-Shaped if the stem is at the end of the slab. 

In this particular post I will be sharing with you a very attractive and ready to use T-Beam Designer v1.1. It is a simple JavaScript code containing all the programming that is needed to design the T-beam, You only have to put the inputs as mentioned at the top and then just hit the calculate button, it will show each step-by-step calculation involved in the design of T-beam and then show you the results as well as the final cross-section diagram. 

What is T-Beam Designer

It is a complete Designer of T-Beam flexural and shear design programmed on JavaScript. It will help you in designing of T-Beam. T-Beam Designer not only give you the results but also shows you the calculation step-by-step involved in the Design of T-Beam.

It is a simple one click program, you just have to enter or input some values and after clicking one button you will get your design as desired.

T-Beam location and plan Layout

Steps for the Design of T-Beam

Step # 1 Calculating / Estimating Beam Dimensions

Step # 2 Calculating the factored load and factored moment

Step # 3 Calculating Effective Flange Width;

Step # 4 Calculating Moments 

Step # 5 Assuming a Lever Arm

Step # 6 Trial Steel Area;

Step # 7 Calculating and checking the value of a and z ;

Step # 8 Checking Minimum Reinforcing ;

Step # 9 Checking values of ε t and Φ

Do You Know?

 Lim, Paramasivam, and Lee (1987) discuss the problem of shear stress leading to failures of flanges detaching from webs when under load. This could prove catastrophic if allowed to occur in real life; hence, the very real need to mitigate that possibility with reinforcement for concrete T-beams.

How to Use T-Beam Designer V1.1 

There are 11 total inputs that you have to give to T-Beam Designer v1.1, which are as under;

Typical Cross-section of T-Beam

Live Load (L.L) 

Live load is that which is provided over the slab supported by the concerned T-Beam in units of psf

Dead Load (D.L)

this dead load is in addition to the load of slab and beam concrete like any other furniter etc. in units of psf

Span:

the span of beam is to be given in feet

Transverse Panel Length,

it is the center-to-center span between two consecutive T-Beams in transverse direction (as shown in the figure)

Concrete Compressive Strength (fc'):

it is 28 days cylindrical compressive strength in units of psi.

Steel yeild Strenth (fy): 

it is the grade of the steel in unit of psi

Strength Reduction factor (phi)

it is used to convert the applied moment to nominal design moment. 

Minimum Reinforcement Ratio (Rho min)

it is to be taken from any suitable table by comparing with fc' and fy

Type of concrete: 

the dimension estimation of the T-beam is also dependent on the type of concrete whether light weight or normal weight.

Thickness of slab: 

it acts as a thickness of flane in units of inches. 

Clear Cover: 

it is to be given in order to estimate d from h in units of inches. 

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Disclaimer

We are not responsible for the consequences of the result of its usage

A Short Course on Tunnel Concept, Design and Construction by PIAS

Pakistan Institute of Engineering and Applied Sciences (PIAS) offer a short course on Tunnels Concept, Design and Construction on 25-26 August 2014, PIAS, Islamabad, Pakistan. The details of this course is as under.

Scope:

The Course focuses on planning, design and construction of tunnels, sharing the knowledge and experience of experts from Pakistan Atomic Energy Commission (PAEC).

 

 

 

 

Tunnel Construction Civil Engineering

Prospective Participants:

• Professionals as well as people from academia in different firms / organizations / Institutes involved in this field.
• Students of Civil, Mechanical and Mining Engineering can also attend.

Methodology: 

Lectures, discussions and case studies.

Venue: 

PIEAS, Nilore, Islamabad

Resource Person: 

Mr. Riaz Ahmad, Member CAC, PAEC

Phone Number:

 (+92) 300 8509658

Fee: 

PKR 10,000/- for Professionals and PKR 5,000/- for Students

Deadline for Registration: 

09^th August 2014.

Application form can be downloaded from www.pieas.edu.pk

Railway Track Design online Calculator

Railway engineering is a significant branch of transportation engineering, Railway transportation is an on-land transportation system with air ways and sea ways as other parallel off-land transportation means. Railway transportation share a healthy burden of transportation of a community or country, carrying large bulky luggage from one end to heavy duty tanks, military equipment at the other. 

Railway Track Design Calculator and Excel Sheet for civil engineers

Railway track has few components named as formation, sleepers, rails, ballast and fixtures. Of course they are easy to understand but will not be covered in this post. 

Mostly one very simple part of railway track design includes the calculation of no. of rails, no of sleepers and quantity of the ballast for specific track having fixed dimensions of track length, sleeper depth, width and height.

In this post I will share with you a very common and simple example on how to calculate these basic quantities from the given information about the railway track.

Design of railway track

This is the example that i have followed in developing this calculator.
The information that we need or the inputs we need are given as under;
Sleeper Dimensions = 10' x 10" x 6"
Length of rail = 60 ft.
Sleeper Density = n + 3
Track Length = 20 km
Sleeper Packing = 100%
Joint spacing = 1"
and we need to calculate the following information;
No. Of sleepers = ?
No. Of Rails = ?
Quantum of Ballast = ?
The formulas and solution of this problem is shown in the following diagram along with formulas;

Formula and variables used in design of railway track

Calculation of Railway Track Design

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Enter the Sleeper Dimensions
a:		(ft)
d:		(in)
e:		(in)
Enter the Ballast Dimensions
b:		(ft)
c:		(ft)
Enter the Track Specifications
Rail Length (Lr):		(ft)
Track Length (Lt):		(ft)
Joint Spacing b/w rails (S):		(in)
Results
No. Of Rails on one side (Nr):		(nos)
No. Of Rails on Both side (TNR):		(nos)
No. Of Sleepers (Ns):		(nos)
Quantity of Ballast:		(Cubic Feet - CFT)

How to use this calculator

Simply input the Sleeper Dimension, Ballast Dimension and Track specification as defined in the above figure. As an example you can also input the sample example data for testing in the specific fields.

Then just click the Calculate button and there you got the results.

Excel Sheet for Railway Track Design

If you find any difficulty in using this calculator or you are not sure enough about its results you can check the formulas and mechanism used there in by downloading the excel sheet for this sample problem and calculator

Download Excel Sheet

For Editor's Desk

In this post I have assumed that you know the basic terminologies involved in the railway engineering. But don't worry you will see a very healthy dictionary of railway engineering very soon on iamcivilengineer.com so stay tuned. Keep on sharing the good work, it will be helpful for you buddies and civil engineers. 

Disclaimer

The use of above included calculator is only for education and testing purpose, the consequences of the use of this calculator will not be the responsibility of iamcivilengineer.com. so use it on your own risk. 

Linear Interpolation made easy

Linear Interpolation is a very efficient and useful technique to get a required data from a limited source of data. In Civil Engineering we have to deal with a lot of calculations like minimum thickness table in Reinforced concrete structures, in Structural Number Calculation in Transportation engineering and so many.

linear interpolation calculation tool

Linear interpolation is a technique of curve fitting in which if a straight line is faced, one can easy find the various points on that line.

What is Interpolation

This tool is provided specially for civil engineers, to help them in their estimation work and in the various civil engineering calculation.

Linear Interpolation Calculation

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Enter the Coordinates of First Points:	X1			Y1
Enter the Coordinates of Second Point:	X2			Y2
Enter the point whose value is required:	X
Round the answer			YesNo
Interpolated value:	Y

How to Use this tool

It is very easy to use this tool, the value which you need assume it by a variable X and let us say its corresponding required value is Y. The values from which a straight line is made, assume it having names X1, Y1 and X2, Y2 as the coordinates.

This tool has a special feature of rounding it off. If you wants to round off then set this option as yes, otherwise set this option as No.

Examples of calculation

let us say we need load damaging factor for design of flexible pavement in transportation engineering where structural number is 3.65 so it comes between 3.60 and 3.70 where load of single axle is 9 k. load damaging factor for 3.60 is 0.0345 and for 3.70 is 0.0225 thus for for SN of 3.65 is 0.0285 as shown in the figure.

linear interpolation calculation example

Editorial Remarks:

The use of this table is under terms of use under privacy section of iamcivilengineer.com. The result or any loss or damage done by using this tool, iamcivilengineer.com would not be responsible. so be cautious in your calculation.

Hope you would like this tool, do share it with other civil engineers as well fellow.

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