Integrated Testing and Numerical Verifications

Research Project 7-1 (RP 7-1)


The aim of this research project is to develop an integrated approach for the design verification of new construction products and processes based on experimental and numerical investigations (IATN), which respects or further develops the basic rules in the Eurocodes, particularly but not exclusively for timber construction.

The building industry faces significant challenges when introducing new products and processes. To be implemented they must comply with standards such as the Eurocodes or obtain individual approvals. These procedures ensure that general safety requirements are met, but they can delay or even prevent the rapid introduction of innovative construction products and processes. In addition, design codes such as the Eurocodes have a long tradition of being developed mainly with a view to “hand-calculation”, thus numerical methods such as finite elements (FE) are not mentioned.

The IATN enables the use of innovative building products and procedures, while ensuring compliance with required safety levels. It can make a significant contribution to the core themes of IntCDC to realise the full potential of digital construction technologies, including planning, design and construction with prefabrication and erection. The idea behind IATN is an integrated design approach where extensive experimental testing can be replaced by numerically simulated tests. However, experimental tests are needed to validate numerical models, which then allow within parameter investigations to produce “fictive test results” that can be treated as proposed in Eurocode 0 Annex D. As part of the development of IATN, a case study will be carried out on slender softwood and hardwood columns and their connections.

On the one hand, the IATN can be transferred to various other materials and situations addressed in other research projects, and on the other hand, the case study of slender timber columns with adequate joints contributes directly to the multi-storey timber buildings system (RP 3-1), implemented in the demonstrator.



Prof. Dr.-Ing. Ulrike Kuhlmann
Institute of Structural Design (KE), University of Stuttgart


Lea Buchholz (KE)
Janusch Töpler (KE)



  1. 2023

    1. Töpler, J., Schweigler, M., Lemaître, R., Palma, P., Schenk, M., Grönquist, P., Tapia Camú, C., Hochreiner, G., & Kuhlmann, U. (2023). Finite element based design of timber structures. Proceedings : Meeting 56 / International Network on Timber Engineering Research. Karlsruhe : Timber Scientific Publishing, KIT Holzbau Und Baukonstruktionen, 56-102–1, Article 56-102–1.
  2. 2022

    1. Töpler, J., & Kuhlmann, U. (2022). In-plane buckling of beech LVL columns. In Proceedings of the 9th meeting of International Network on Timber Engineering Research (INTER) (Nos. 55-2–1; Issues 55-2–1).


  1. 2022

    1. Töpler, J., Buchholz, L., Machanek, S., & Kuhlmann, U. (2022). Guidelines for a Finite Element Based Design of Timber Structures (J. Töpler & U. Kuhlmann, Eds.).
    2. Töpler, J., & Kuhlmann, U. (2022). Experimentelle und numerische Untersuchungen von Brettschichtholz aus Buchen-Furnierschichtholz (BauBuche). Doktorandenkolloquium Holzbau Forschung + Praxis, Online.
    3. Töpler, J., & Kuhlmann, U. (2022). DIBt - ZP 52-5-13.194 - Imperfektionsmessungen an stabilitätsgefährdeten Holzbauteilen - Schlussbericht. /brokenurl#for:intcdc
  2. 2021

    1. Kuhlmann, U., & Gauß, J. (2021). Stiffness of Steel-Timber Dowel Connections – Experimental and Numerical Research. INTER 8th meeting, Online.
    2. Kuhlmann, U., & Töpler, J. (2021). Imperfections of slender glulam beams. INTER 8th meeting, Online.
    3. Kuhlmann, U., & Töpler, J. (2021). Analytical and numerical investigations on imperfection-sensitive timber members subjected to combined bending and axial compression. WCTE 2021, Online.
  3. 2020

    1. Töpler, J., & Kuhlmann, U. (2020). FE-gestützte Bemessung im Holzbau. Doktorandenkolloquium Holzbau Forschung + Praxis, Stuttgart.



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