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Privacy and Cookies

Data Security

Website Terms and Conditions

Software Licensing Terms

Privacy and Cookies

We may change this privacy notice from time to time by updating this page.

What information do we collect?

When you use this website, we may collect the following information:

  • the areas of the website that you visit
  • information about your computer, such as which browser you are using, your network location, the type of connection you are using (e.g. broadband, ADSL etc) and your IP address

We do this by using cookies, which are small files that help us track how our visitors use the website and enable us to understand where we can improve your experience. If you would like to find out which cookies we use and the information they track see our Cookies Policy.

Once you submit or register information through our website we will know who you are and your activities on this website and information about you and/or your company may be recorded on our systems. For example, we may ask for personal information when you download our software including:

  • your name
  • company name
  • email address
  • postal address
  • telephone number
  • country where you are based
  • Social media ID
  • your comments/questions
  • services/markets you are interested in

We may also collect personal information from telephone calls and/or other correspondence with you.

What do we do with the information we collect?

The information we capture is used for various purposes. The main purpose is to provide you with our services (whether available via the website or offline). We also use the information for:

  • website development
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  • understanding what potential clients are interested in
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  • service development
  • internal record keeping


We would like to provide you with information about our services and other information which we think you may find interesting. We may send you such information by post, email and/or telephone, unless you have asked us not to do so.

We will not provide your personal information to other organisations for marketing purposes without your explicit consent.

If at any time you do not want your information used for direct marketing purposes, please contact us or follow the unsubscribe link in our marketing email messages.

Who do we share this information with?

We may share your personal information with companies acting on our behalf who will only use the information to provide that service. However, we will retain control of your data and any third party service provider that we use must act in accordance with our instructions. We may also share your personal information with a purchaser or potential purchaser of our business.

In some circumstances, we may have to disclose your personal information by law, because a court or the police or other law enforcement agency has asked us for it.

How to get copies of or amend the information we have collected

You may request details of the personal information that we hold about you under data protection laws. If you would like a copy of the information held about you please write to us at oasys@arup.com or at: Data Protection Officer, 13 Fitzroy Street, London, UK, W1T 4BQ. Please note that we may charge a small £10 administration fee for information requests.

If you think any information we have about you is incorrect or incomplete, please email us as soon as possible. We will correct or update any information as soon as we can.

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Data Security

We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect, including locked cabinets, electronic password protection and pass card access to buildings.

If at any point you suspect or receive a suspicious communication from someone suggesting they work for Oasys or a website claiming to be affiliated with Oasys, please forward the communication to us or report the incident by email to oasys@arup.com or in writing to Oasys, 13 Fitzroy Street, London, UK, W1T 4BQ as soon as possible.

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Website Terms and Conditions

The contents of this web site are protected by copyright and other intellectual property rights under international conventions. No copying of any words, images, graphic representations or other information contained in this web site is permitted without the prior written permission of the webmaster for this site.

Oasys accepts no responsibility for the content of any external site that links to or from this site.

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Software Licensing Terms

Terms and Conditions of Purchase

The full conditions of purchase and maintenance for all Oasys software are set out in the Oasys Software Licence and Support Agreement. All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.

Maintenance & Support Services

Twelve months support and maintenance is included with most products. Thereafter maintenance is typically 20% of the current sales price.

An annual maintenance service is available for most programs after the first year.

This service includes:

  • telephone/fax/email/web based support
  • free software updates available via internet download
  • personalised output header for many products

AdSec FAQs

Find the answer to frequently asked questions from existing users.

Most popular FAQs

We are often asked when it is best to use ADC and when AdSec? After all, they both design reinforced concrete.

This is of course true, but ADC and AdSec approach the problem of concrete design from opposite directions: ADC takes the loads and gives you the rebar while AdSec takes the rebar and gives you the loads. Which is best depends on your situation.


Let’s first look at ADC, which is broken down into two aspects: AdBeam and AdCol.

ADC AdBeam

AdBeam designs multi-span concrete beams, solid slabs and ribbed slabs. You define the number of spans, the supports and other geometries. ADC will then calculate the bending moments and shear forces, taking into account patch loading and redistribution, to give you the most efficient reinforcement arrangements.


AdCol is similar in approach to AdBeam, but instead designs a single lift of a concrete column. Here you supply the section, axial and moment loads; ADC will first give you the bars that meet the detailing rules and then tell you which sections carry the load including which is the most efficient.

As part of the results, you can choose to print out the Axial v. Moment (N/M) and Biaxial Moments for given Axial (M/M) charts.


AdSec takes a different approach to ADC: you give the reinforcement and AdSec will tell you how strong it is and if it is strong enough. It is thus much more powerful, flexible, and hence demanding than ADC. You could say that it is advanced analysis for advanced engineers.

As an example, while AdCol only lets you try circular and rectangular sections and AdBeam rectangular, T, taper, I and taper T, AdSec lets you analyse all of these concrete shapes plus many more, including steel sections, bridge beams and even sections you define yourself. Similarly, while ADC only has reinforced concrete, AdSec also has steel and FRP materials such as carbon fibre. In addition, while ADC only has set locations for the rebar, AdSec allows you to put it anywhere within the section, assisted by templates and Excel links. You can also prestress the rebar or create new materials.


What does AdSec give you? Firstly, like ADC, AdSec can output charts of axial load against moment (known as N/M charts). You can find examples of these in BS 8110 part 3. AdSec also plots major moment against minor moment (or Myy/Mzz charts) for various multiple axial loads. These tell you what moments you can put on a section in each direction for a given axial load


AdSec can also draw the change of section stiffness (EI) as it cracks under moment combined with varying axial loads. This can be very useful if you want to accurately predict concrete deflections. Alternatively, it can give you the curvature of the member as the moment increases.

Under serviceability loads, AdSec can calculate the crack widths around the section and highlight which bar is responsible for controlling the largest one.

Ultimate Capacities

Under ultimate loads AdSec can tell you if the section is adequate or not, plus it can tell you the maximum axial capacity for your specified moment and the maximum moment for your given axial load. You can also look in detail at the stresses and strains in the concrete and reinforcement.

Composite and Compound sections

AdSec can also create compound and composite sections. For example, you can define a concrete beam, load it up with its self-weight and the wet weight of the concrete slab, then analyse the compound beam/slab section under service loads. Another typical use is to take a steel column and either wrap it in concrete or fill the inside, enabling you to check the capacities of composite columns ore even mega-columns. You can also take an existing concrete beam or column and see how much extra capacity you can get from applying carbon-fibre plates to the outside.


What does this mean in practice? Let’s take a piling designer as an example. When you use ADC AdCol to design piles, you input the loads for each pile and are given the reinforcement in return. You might then rationalise the rebar choices or arrange beforehand that ADC only gave you a limited choice. If, on the other hand, you use AdSec, then you would define a number of standard piles in advance, work out their capacities, plot the N/M charts, etc, and then allocate the designs to the piles accordingly.

Similarly, if you are designing a concrete building, then ADC is excellent for standard beams and columns, but if you need something more advanced like composite columns or elliptical sections, then you need AdSec.

If, on the other hand, you are designing a bridge, then AdSec is the one for you.

In summary: ADC for quick and simple, and AdSec for advanced!

Enable prestressing by selecting the prestress advanced feature preference (‘Tools | Preferences | Advanced’) Then individual bars can be prestressed with force or strain in the general reinforcement table. The prestress can then be modified using the prestress factor for individual analysis cases.

AdSec uses analysis cases similar to those in GSA. So a ULS analysis case can be defined as 1.4L1 + 1.6L2 where load cases 1 and 2 are dead and imposed loads respectively.

All FAQs

With AdSec it is possible to analyse the effects of adding more structure onto existing sections that are already loaded.

For example, if we were modelling a reinforced concrete beam that is un-propped before the slab is cast on top. To do this we would need a beam section that stops at the slab soffit, a slab section that represents the effective width, and a compound section that has the two appropriately adjacent.

To conduct the staged analysis:

  1. Create a load for the Beam, say a Section Force applying the bending moment
  2. Create a SLS load case that applies that load to the Beam
  3. Run the SLS analysis for the Beam section
  4. Go to Tools > Extract Strain Plane… and chose the appropriate strain plane. This will create a new load that is a Component Strain on the Beam section
  5. Set the Compound section as active
  6. Create a new Section Force, etc. that represents the additional load
  7. Create a SLS or ULS load case that analyses the compound section for the extracted strain plane and the new load from #7

This method also works, for example, for strengthening existing in situ beams, columns, and slabs with steel or carbon fibre plates.

Sometimes AdSec finds it difficult to converge on some of the N/M chart points hence part of the chart becomes flat. it is because the defined solver parameters are insufficient to get a converged solution.

Slightly altering the solver parameters (either Maximum number of iterations or perturbation factor or both) will generate a perfect N/M chart. You can change these parameters at the N/M chart generation wizard>Analysis Control.

Occasionally AdSec may report that there is no solution found. This may be because there is no possible solution, or it may be that the iterative solver has not yet reached it.

You can change the search parameters in the SLS or ULS analysis wizard > Analysis Control. 


Increase the maximum number of iterations. You may also find that adjusting the perturbation factor can help as well.


AdSec will also struggle to converge under pure axial load as there are an infinite number of possible strain planes that can satisfy that condition. The trick is to add a negligible moment into the load case, or even the code-based eccentricity, to ensure that AdSec has just the one solution to find.

In order to model non-linear cross sectional thermal gradients, break the section into a suitable number of strips/sections which are then compounded to make the overall section. You can then apply component strains to each in accordance with the thermal changes. This can be combined with the overall effects of axial forces and moments generated on the member by the end conditions; these will have to be derived independently. Ensure that each reinforcement bar/line/group exists wholly within a single section.

To achieve an almost regular section you can specify a standard section in the section wizard, convert it into a perimeter section (using the ‘Options | Expand Section’ command) and then adjust the perimeter section in the section wizard. In this circumstance any template reinforcement is converted to general reinforcement ensuring that the reinforcement definition remains complete.

The section wizard can be used to specify component sections; these can be used to build up compound sections.

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