Shear tests on thermal insulating clay unit masonry walls with thin layer mortar

Abstract

The paper presents the results of a series of 6 shear tests on full scale highly thermal insulating clay unit masonry walls. The walls consisted of units with large voids filled with mineral wool with a thermal conductivity of λ = 0,07 W/(m · K). The aim of the investigations was the verification of the in‐plane‐shear resistance of this type of thermal insulating clay unit masonry in addition to the tests reported in [1]. The current design rules for clay unit masonry in DIN EN 1996‐1‐1/NA are rather conservative compared to the test results for thermal insulating units.

Schubversuche an hochwärmedämmendem Ziegelmauerwerk mit Dünnbettmörtel

“…This is also confirmed by the tests evaluated in [1] on further clay masonry units with national technical approvals. The objective was the investigation of the loadbearing behaviour of thermal insulating precision clay masonry unit walls under realistic constraints and to check the quality of the design equations currently given in EN 1996-1-1/NA and the special features of the requirements of the relevant technical approval in Germany.…”

“…It turns out that the design equations in the current code DIN EN 1996-1-1/NA tend to describe the tests on the safe side. This is also confirmed by the tests evaluated in [1] on further clay masonry units with national technical approvals.…”

“…with: f the factor to convert from average values to characteristic values V Rk,Test the characteristic value of the horizontal load (shear force) In [1], the factor f was determined as 1.155. This confirms the validity of the practice until now of only providing one test for each combination of geometry and imposed load in shear tests and determining the characteristic shear loadbearing capacity by reducing this test value by a factor of 1.2.…”

“…Dies wird auch durch die in [1] ausgewerteten Prüfungen an weiteren Mauersteinen mit allgemeiner bauaufsichtlicher Zulassung bestätigt. Ziel war die Untersuchung des Tragverhaltens von wärmedämmendem Planziegelmauerwerk unter realistischen Bedingungen und die Überprüfung der Güte der derzeit in der EN 1996-1-1-1/NA angegebenen Bemessungsgleichungen und der Besonderheiten der Anforderungen der bautechnischen Zulassung in Deutschland.…”

“…Dabei stellte sich heraus, dass die Bemessungsgleichungen in der aktuellen Norm DIN EN 1996-1-1-1/NA die Prüfungen gut und auf der sicheren Seite liegend beschreiben. Dies wird auch durch die in [1] ausgewerteten Prüfungen an weiteren Mauersteinen mit allgemeiner bauaufsichtlicher Zulassung bestätigt.…”