Mat footing design

Posted on 11.03.2021 Comments

A mat foundation is a thick reinforced concrete slab supporting arrangements of columns or walls in a row or rows and transmitting the loads to the soil. It is used to support storage tanks, industrial equipment, silos, chimneys and various tower structures. It is common to use mat foundation or deep basements to transfer the column loads to the underlying soil as well as provide floor slab for the basement. A mat is preferred to the individual footings when the soil mass is very erratic and contains pockets and lenses of compressible soils.

In such case individual spread footings are subjected to large differential settlements whereas the mat bridges over the patches of the weak soils and the differential settlement is considerably reduced.

Mat Foundation, Its types and Advantages

Flat Plate Mat — A flat plate mat is used for fairly small and uniform column spacing and relatively light loads. A flat plate type of mat is suitable when the soil is not too compressible. A line sketch of this type of mat is shown in Fig 1. Plate Thickened under Columns — For columns subjected to very heavy loads usually the flat plate is thickened under columns as shown in Fig 2 to guard against diagonal shear and negative moments.

Two-way Beam and Slab — When the column spacing is large and carries unequal loads it would be more economical if a two-way beam and slab raft as shown in Fig 3 is used. This type of mat is particularly suitable when underlying soil is too compressible.

Plates with Pedestals — The function of this mat is same as that of flat plate thickened under columns. In this mat pedestals are provided at the base of the columns.

Rigid Frame Mat — This type of mat is used when columns carry extremely heavy loads. In such design, basement walls act as ribs or deep beam. When the depth of beam exceeds 90 cm in simple beam and slab mat, a rigid frame mat is referred. Fig 4 shows a typical rigid frame mat. Piled Raft — In this type of construction the mat is supported on piles as shown in fig 5. This type of mat is used where the soil is highly compressible and the water table is high. This type reduces settlement and control buoyancy.

2 stage sluice box

Like this: Like Loading Multi-Pattern Running Light Circuit. Bearing Capacity of Mat Foundation.I must be getting dumber in my old age. I don't understand your website Am I missing something?

mat footing design

Is it possible to get some information regarding the input data for the 'design of raft foundation' Excel sheet? I mean, it would be helpful to know how the values of the Sheet1 i.

Thanks in advance for your answer.

Sex videos aunties telugu oc

I think its not possible to design raft using ordinary spreadsheet. Adding to that, so far, I have not come across any building supported on just four columns. Various other useful spread sheets other than raft are available which is very helpful for beginners. Nice work please keep it up. Excel Sheets. Design of Raft Foundation Excel Sheet. August 12, Design of Raft Foundation Excel Sheet Raft foundation is a thick concrete slab reinforced with steel which covers the entire contact area of the structure like a thick floor.

Sometimes area covered by raft may be greater than the contact area depending on the bearing capacity of the soil underneath.

The isle updates

The reinforcing bars runs normal to each other in both the top and bottom layers of steel reinforcement. If you love to learn Project Management and Planning for projectdo Estimate Cost for project and managing it you can do it Click here. Click here to download. Unknown September 18, at PM. Unknown March 22, at AM.

mat footing design

Unknown December 9, at AM. Newer Post Older Post Home. Subscribe to: Post Comments Atom. Find me on facebook. Popular Posts. Sheet Pile Design Spreadsheet. Project Management Templates.From your drawings, we manufacture and deliver high quality metal building systems under your brand name. These digital color charts are intended to be viewed on a computer monitor to show the wide range of colors available. Physical color charts and actual metal samples for color matching purposes are available on request.

Technical erection manuals for Whirlwind panel products include information on engineering specifications, preparatory requirements, erection sequence, special erection techniques and detailed design information.

These editable specifications manuals provide a standardized classification for construction information. This information can be useful to contractors, engineers, architects and other construction industry professionals. Additional resources including load tables, trim selectors, product specifications and brochures. We offer a range of warranties across our product lines that include 10, 35 and year coverage.

Mat Foundation, Its types and Advantages

Whirlwind manufactures a complete line of metal roofing and wall panels, plus trim and other accessories for all industry types. Unmatched quality and expertise, Whirlwind Steel has been manufacturing stylish, functional, durable, and affordable metal buildings and components for more than 60 years. The type of foundation your building requires depends on many variables: soil type, building load, and environment to name a few.

Sometimes the surface soil is very loose but below it is rock or very solid soil. Taller, heavier buildings require stronger foundations, while a shorter, wider building spreads the load over a larger patch of ground and can use a shallower foundation. A mat foundation, sometimes called a raft foundation, looks like it sounds. You may have heard it referred to as a slab foundation, a common choice for steel buildings.

Mat foundations are appropriate for light pre-engineered metal buildings with multi-span rigid frames and flexible walls. And they are suitable for building on poor soil excluding peat and organics that is uniform in consistency. Heavy column and wall loads are distributed across the building area to lower the contact pressure, more so than with footings. Mat foundations are popular in areas where basements are common. Mat foundations are cost effective choices for individual column footing areas totaling an area covering more than half the total footprint of the completed building.

It is at its least expensive when the top of the mat is at floor level; meaning slab-on-grade is not needed. Mat foundations are best for buildings of moderate size with a regular layout. Horizontal column actions to the outside are canceled within the mat while inward reactions are mitigated by the friction of the mat on the soil.

The best designs minimize the effects of settling between the columns.Mat foundationalso known as a raft foundation or floating foundation, is a way of giving extra support to a building.

Design of Raft Foundation Excel Sheet

There are many reasons why Mat foundation is chosen by builders across the globe. One reason is if the soil, on which the building is constructed, does not have a bearing capacity.

Since, this soil is not able to support the building on its own, a mat foundation is built under the building. Another reason why builders prefer this kind of foundation is when a building has to be made on a mining area or it has a subsoil water condition. One more reason, why mat foundation finds place under a building is when the landscape is such that individual pillar cannot be constructed or the design results in overlapping of these support pillars.

In all of these situations, the mat foundation gives the required support needed for the building to stand strong. Mat foundation is constructed as a large slab which works as the base for the building.

The building then rests on this foundation, leading to lesser contact with the land and hence more strength and stability. The Mat foundation is also reinforced with many bars inside it which run perpendicular to each other. Such reinforcements make it a very strong base, which is ideal for large buildings. The mat foundation is always larger than the structure itself.

The site where the structure has to be constructed is first excavated. When the site has been leveled and dried up, the slab of the mat foundation is laid down. This gives the building a foundation which is strong and durable and the construction starts on the slab. There are many reasons why a mat foundation is one of the most used foundation in difficult areas. Here are some of the advantages:. These drawbacks are small in front of the advantages that mat foundation provide in terms of cost of the project and feasibility.

This is why, these foundations are used by the worldwide builders to construct buildings on a structure. This is also the reason why more areas and soil conditions are opening up for construction and building.

Dj kunta and deplay

Earlier shifting soils or mining areas were considered dangerous for building structures. Today, with the advent of mat foundation, the scenario has completely changed. Mat foundation is providing a solid base for many buildings all across the globe.Mat foundation is also known as the raft foundation. It is a continuous thick concrete slab on the soil that extends the entire footprint of the building and increases the soil bearing capacity power.

This foundation supports the entire building loads and safely transfer it to the ground.

Renault r link toolbox

At those places, we use mat foundations to distributes the whole loads of the structure to the soil When the area of the footing was increase than the soil load-bearing capacity will also increase because this foundation reduces the stress on the soil at the same place. There is no major difference between the mat and raft foundations, both are the same.

It is a basic concept of stress in civil engineering. Weight divided by per unit area is called stress. This foundation is very useful for basement structures.

After the PCC, reinforcement steel bars are tied cage in place and then the desired thickness of the concrete According to the design is poured. There is a lot the important reason for the use of mat foundations.

Can a mobile phone be tracked when switched off

We use this foundation if the. Flat plate raft is used in the small and lightweight load structure. This type of foundation is suitable when the soil is not compressible. The reinforcement bars are provided in both direction top and bottom in the form of a mesh cage.

The Slab thickness should be increased when the upcoming column loads are very heavy. The flat plate foundation is not suitable in those structures where the column loads are very high then the thickened flat plate is used. In this type of mat foundation, beams are placed in perpendicular directions and all the beams are connected by RCC slab. The columns are placed on the intersection of beams. This foundation is supported by piles in the soil. The piled raft foundation is suitable for the soil of high compressibility and where the water table is high.

Piled raft foundation is mostly used for the high rise buildings. Rigid frame mat is used, when the columns have a very high load on them. In rigid frame mat design, the basement RCC wall acts as a deep beam or ribs. It is also termed as a box mat foundation. In the cellular mat foundation, the structures of boxes are formed and walls of every box act as beams. The walls are connected by slabs at the top and bottom. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Now Trending: Coarse Aggregate — Fine Aggregate — I Brick size — In Mosaic Tiles — Its Contents 1 Mat Foundation 1. Engineer Moid October 15, Reply. Add a Comment Cancel reply Your email address will not be published. Home Contact us Privacy Policy Disclaimer.Welcome to our community forums, full of great discussions about Structural Engineering.

Please register to become a part of our thriving group or login if you are already registered.

mat footing design

By Engr. Usman JavedApril 28, in Foundation Design. You need to be a member in order to leave a comment. Sign up for a new account in our community. It's easy! Already have an account?

Sign in here. Fatima Khalid posted a topic in General DiscussionDecember 3, Palash Engr posted a topic in Concrete DesignJuly 26, Fatima Khalid posted a topic in Foundation DesignJuly 23, By hali Started Friday at AM.

By using this site, you agree to our Terms of Use and Guidelines. Foundation Design Search In. Register or Sign In. Mat or Raft Footing design By Engr. Usman JavedApril 28, in Foundation Design raft. Recommended Posts. Report post. Posted April 28, Share this post Link to post Share on other sites. Posted April 29, Dear Usman, Here are a few links, containing examples of raft foundation design :- 1. Posted April 30, Raft design is no different from that of a slab!

Its infact an inverted slab. Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community. Register a new account. Sign in Already have an account? Sign In Now. Go To Topic Listing. WHY DO WE CARE During an extreme seismic event, the code-based structure is expected to maintain its load-carrying capacity for gravity loads even after the structure deforms into inelastic range so that it does not pose any life safety hazard.

Hence, the joint can go through significant degradation of strength and stiffness, and if it fails in shear, or anchorage, the life-safety objective of code cannot be achieved. It means that longitudinal bars must have adequate development length for hooked bars. This implies that the size of the column must be such that bars can develop their tensile forces.Welcome to our community forums, full of great discussions about Structural Engineering.

Please register to become a part of our thriving group or login if you are already registered. By abbaskhanJune 24, in Foundation Design. What can be the possible solutions of the problem? We normally create 1m wide strips 0. This will give area of one bar. You need to be a member in order to leave a comment.

Concrete Slab Foundation - Process & Best Practices

Sign up for a new account in our community. It's easy! Already have an account? Sign in here. Fatima Khalid posted a topic in General DiscussionDecember 3, Palash Engr posted a topic in Concrete DesignJuly 26, Fatima Khalid posted a topic in Foundation DesignJuly 23, By hali Started Friday at AM. By using this site, you agree to our Terms of Use and Guidelines. Foundation Design Search In. Welcome to SEFP! Register or Sign In. By abbaskhanJune 24, in Foundation Design mat. Recommended Posts.

Report post.