Structural and precast unit design
Insinööritoimisto Laaturakenne Oy specialises in structural and precast unit design, with a focus on concrete construction. We provide structural and precast unit expertise for business areas such as industrial, residential and office construction. In addition, we engage in structural design for preliminary tenders or draft designs, from selection of single dimensions to complete framework solutions.
Newest references
Location | Town/city | Scope of project | Design sector |
As Oy Kuopion Kaijankulma | Kuopio | Structural and precast unit design | |
Autoliike J. Rinta-Jouppi Oy | Kuopio | 1238krs m2 | Structural and precast unit design |
Karjarakennus Kaarakainen | Iisalmi | 3047m2, 21790m3 | Precast unit design |
Prestressed concrete structures and reinforcement design
One of Insinööritoimisto Laaturakenne Oy’s specialisms is reinforcement design for prestressed concrete structures. Reinforcement design covers the design of all types of prestressed structures such as hollow core, shell, TT and HTT slabs, standard I and HI beams, concrete-on-concrete composite structures and, of course, reinforced concrete products in general. We most often create designs for precast unit manufacturers, or as consultants for other design agencies and organisations.
Newest references
Location | Town/city | Scope of project | Design sector |
As Oy Turun Truumanni | Turku | 3906krs-m2, 13030m3 | |
Lapin liikuntahalli | Lappi | 994krs-m2, 8000m3 | |
Merikeskus Vellamo | Kotka | 14366m2, 118000m3 | Reinforcement design for JK beams and hollow core and shell slabs |
Renovation, and inspection of old structures
Insinööritoimisto Laaturakenne Oy also offers structural design for renovations. This generally involves modifications or extensions that require the analysis of old structures due to changing loads or other structural changes. Computational analysis of old structures may be necessary when their carrying capacity is in doubt after the detection of possible minor damage, or when taking preventive measures to ensure that the structure continues to function properly.
In many cases, ensuring the durability and usability of structures also creates a need for consulting, ranging from site visits to various structural analyses. A typical example would the inspection of old suspended ceiling structures.
Newest references
Location | Town/city | Scope of project | Design sector |
As Oy Pielanranta | Pielavesi | Structural design of lift shafts | |
Luistelijantie 1-3 | Kuopio | Design of roof renovation | |
As Oy Kuopion Kotipesä | Kuopio | Structural design of lift shafts |
Software development and sales
Dimensioning software for prestressed concrete structures
Dimensioning software for prestressed concrete cross-section
Dimensioning software for reinforced concrete beam
Dimensioning software for reinforced concrete cross-section
Saving of input data
Price list 1
Concrete structure software
Developed with a focus on professional reinforcement design, these software products are very fast and efficient to use. They provide plenty of dimensioning data and can be used to model a wide variety of structures. They have been developed using the Visual Basic/Visual Studio software and run in standard Windows user environments. The products are described in more detail below.
The software products have a wide range of users. They have mainly been used to design reinforcements for reinforced and prestressed concrete structures on behalf of precast unit plants, and in dimensioning for tenders. Users include companies such as Parma Betonila, Lujabetoni Oy, Insinööritoimisto SRT Oy and SWECO.
Dimensioning software for prestressed concrete structures
JbPalkki B4 1.2 (version 16 February 2008) (Calculation according to RakMK B4)
JbPalkki EC2 3.0 (Version 14 December 2019) (Calculation according to Eurocode 2)
JbPalkki EC2 2019 PRO (Version 14 December 2019) (Calculation according to Eurocode 2) NEW SOFTWARE!
Calculation principles used in software
Calculations are based on the application of plasticity theory. The shape of the compression zone is based on a parabola equation (the calculation divides the compression surface into 50 equally high ‘slices’) and is not therefore replaced by a traditional rectangular stress distribution. Otherwise, RakMK B4/Eurocode 2 or other generally accepted calculation methods are generally applied.
During bending, the software obtains the required compression zone height corresponding to the stress state and reinforcement. The height of the compression zone, compression of the concrete, and strain on the pre-stressed and concrete steel are based on the equilibrium state corresponding to the degree of reinforcement when failure state has been reached.
Cutting capacity is calculated according to RakMK B4/Eurocode 2.
Conventional prestressed concrete structures without composite effect.
The software can be used to model a wide variety of prestressed concrete structures. Here is a list of some of the most common prestressed concrete products for which the software performs calculations:
Rectangular and inverted tee beams. The beams can be of constant height, gable roof beams, one-sided gable roof beams, or beams whose height increases in steps (e.g. a beam with a notch in the upper surface)
- I and HI beams
- TT and HTT slabs
- Hollow core slabs, bathroom hollow core slabs
- Solid slabs.
- Prestressed wind columns without a vertical load
Composite structures
All of the above structures can also be counted as composite structures, where the precast unit is usually cast at the factory and then cast-in-place. Composite casting may be done above or below the unit’s upper surface, or both simultaneously. Composite casting can be done along the entire, or only part of, the unit. Composite casting can be either uniformly wide, or the width can change linearly, developing to full width at a selected ‘gradient’ e.g. 1:3.
Composite structures can be modelled either unsupported or supported. The load usually comprises the top slab’s weight on top of the unit. In such a case, the software takes account of issues such as the calculation of edge stresses and deflections, even when using the summation principle to calculate stresses during composite casting. If the structure is supported, the software interprets the load during composite casting as equal to the weight of the unit only.
Dimensioning software for prestressed concrete cross-section
JbPoikkileikkaus B4 1.2 (version 12 January 2008)
JbPoikkileikkaus EC2 3.0 (version 14 December 2019)
The software uses the same calculation module as JbPalkki. It can be used to check one cross-section. A cross-section and reinforcement data are input. Strength quantities can be calculated by other software or manually. Strength quantities calculated by other means are input, after which the software will dimension the cross-section in question. The software can also be used to calculate composite structures.
Dimensioning software for reinforced concrete
TbPalkki B4 1.1 (version 17 October 2009)
TbPalkki EC2 3.0 (version 14 December 2019)
This software has similar content to JbPalkki. However, it is slightly more minimal and basic when calculating reinforced concrete structures. It can be used to calculate structures of constant height, where the cross section does not change. In such a case, the cross-sectional shape is modelled as in the JbPalkki software. It is fairly useful software for most reinforced concrete structures when dimensioning without the composite effect.
Dimensioning software for reinforced concrete cross-section
TbPoikkileikkaus B4 1.2 (version 17 October 2009)
TbPoikkileikkaus EC2 3.0 (version 14 December 2019)
The software uses the same calculation module as TbPalkki. It can be used to check one cross-section. A cross-section and reinforcement data are input. Strength quantities can be calculated by other software or manually. Strength quantities calculated by other means are input, after which the software will dimension the cross-section in question.
Saving of input data
All input values entered into software can be saved as a text file (*.txt). This feature makes use of the software markedly more efficient.
Price list 1
Software | Activation fee *) | Licence rental price |
---|---|---|
JbPalkki EC2 PRO | 60 € | 50 €/month |
JbPalkki EC2 | 60 € | 35 €/month |
JbPoikkileikkaus EC2 | 60 € | 15 €/month |
TbPalkki EC2 | 60 € | 30 €/month |
TbPoikkileikkaus EC2 | 60 € | 15€/month |
JbPalkki B4 | 60 € | 20 €/month |
JbPoikkileikkaus B4 | 60 € | 10 €/month |
TbPalkki B4 | 60 € | 15 €/month |
TbPoikkileikkaus B4 | 60 € | 10 €/month |
USB-software key 56€ | (only in exceptional cases) | no monthly fee |
Price is exclusive of VAT/1 user.
All EC2 software as PRO package €120/user + €85/month.
All EC2 software as packages €120/user + €70/month.
All B4 software as packages €120/user + €40/month.
Upgrade of JbPalkki EC2 to JbPalkki EC2 Pro version €0 (switch to rental licence).
Ask for a quote when buying several software products!
Laaturakenne reserves all rights to change its product prices!
B4 = calculation according to RakMK B4.
EC2 = calculation according to Eurocode 2 and Finnish national annex.
Find out your own software versions and ask for the latest updates!
Spreadsheets
It has been developed using the Open Office Calc software and runs in standard Windows environments. The software products have been developed for professional use. However, they are easy to use and intuitive. The software products are described in more detail below.
The software products have a wide range of users. They have mainly been used to design reinforcements for reinforced and prestressed concrete structures on behalf of precast unit plants, and in dimensioning for tenders. Typical users are designers working for precast unit factories and structural and precast unit designers engaged in the general design of concrete structures.
The software products work with Open Office Calc. Open Office software is freely downloadable from the Internet at http://en.openoffice.org/. (The software may also be compatible with Microsoft Excel, but we cannot guarantee that they will work in exactly the same way with Open Office in all situations.)
Dimensioning software for hollow core slab cutting capacity
Hollow core slab EC2
This software calculates the cutting capacity of a hollow core slab with non-settling support, on the basis of the input data provided. The calculation is based on the Eurocode. The calculation takes account of the Finnish national annexes and product standard SFS-EN 1168 + A1 for hollow core slabs.
Dimensioning software for the anchorage length of prestressed strands
Anchorage of prestressed strands EC2
This software calculates the anchorage length of a prestressed strand based on the input data. The calculation is based on the Eurocode. Finnish national annexes have been taken into account in calculations.
Price list 2
Hollow core slab EC2 | request a quote |
Anchorage of prestressed strands EC2 | request a quote |
Research and development
Insinööritoimisto Laaturakenne Oy offers product development services including the preparation of various diagrams, product sheets, and installation and design instructions. Product development services are often needed to bring new products to market or make older products more usable.
An example of a typical product development project would be the compilation of technical documentation related to the CE marking required by the Eurocode.
New References
Location | Town/city | Scope of project | Design sector |
Ansion Sementtivalimo Oy hollow core slabs | Paimio | Calculation material for CE marking of hollow core slabs | |
Betset Oy hollow core slabs
Mikkelin Betoni Oy |
Kyyjärvi
Vierumäki |
Calculation material for CE marking of hollow core slabs
Product development for lift shaft system |
|
Solar Glass Oy/fire compartments | Kuopio | Research and development |