Due to the ongoing climate change and the associated more difficult growing conditions for spruce
trees, a shortage of this material is to be expected in the future. To counteract this development, the
“LaNaSys” research project at the Technical University of Munich is working on the development of
dissolved hybrid cross-laminated timber ceiling elements. However, due to the manufacturing
process and the transportation conditions of the wooden ceiling elements, it is necessary to consider
the friction-locked connection of the individual elements during installation.
The CLT-Connector from Sherpa already has approval for conventional cross-laminated timber. The
aim of this master's thesis is to check whether the use of this connector is also possible with dissolved
hybrid cross-laminated timber ceiling elements. In addition, initial characteristic values for the design
are to be determined analogous to the Sherpa data sheet.
Experimental investigations were carried out to clarify the research question. In addition to the
geometries of the dissolved hybrid cross-laminated timber ceiling elements, the length of the screws
used in the Sherpa CLT connector was also varied in the series of tests. In order to obtain
comparative values, a test series was also tested in which a beech wood lamella served as the
fastener.
When evaluating the test results, it becomes clear that the geometry of the dissolved hybrid crosslaminated timber ceiling elements and the placement of the fastener have a decisive influence on
the load-bearing capacity. In addition, the proportion of wood in the individual screws used in the
CLT connector plays a major role in relation to the failure mechanism.
The test specimens in which the beech wood lamella was installed had the lowest average breaking
load compared to all other test series. In addition, the coefficient of variation is highest due to the
different test results.
In the test series with the Sherpa CLT connector, the load-bearing capacity of the test specimens
was increased by using the longer screws. However, the increase is smaller than that stated by
Sherpa für conventional CLT. The breaking loads of all test series with screws of the same length
show almost identical values despite the different CLT geometry.
In order to be able to design the Sherpa CLT connector in dissolved hybrid cross-laminated timber
ceiling elements in the future, additional analyses must be carried out. This master's thesis aims to
form the basis for further investigations. Sherpa should also strive for approval of its product for
dissolved hybrid cross-laminated timber ceiling elements.
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Due to the ongoing climate change and the associated more difficult growing conditions for spruce
trees, a shortage of this material is to be expected in the future. To counteract this development, the
“LaNaSys” research project at the Technical University of Munich is working on the development of
dissolved hybrid cross-laminated timber ceiling elements. However, due to the manufacturing
process and the transportation conditions of the wooden ceiling elements, it is necessary to consider
t...
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