New regulations for flat clay lintels
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1 Marginal conditions for flat lintels with...
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2 Marginal conditions for flat lintels with...
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3 Examples of tension boom types regulated in...
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4 Flat lintel of clay unit masonry with...
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5 Requirements for thermal insulating lintels...
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6 Possible arrangements of tension booms for...
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7 Possible arrangements of tension booms for...
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8 Tentative experiments for deflection of flat...
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9 Load deflection curve of flat lintels with...
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10 Test specimen, lintel height 375 mm [10]
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In Germany flat lintels were regulated since 1977 in the flat lintel guideline specification and supplementary technical approvals. With the conversion of the design to the partial safety concept a revision was necessary in this respect. Load-bearing flat lintels with tension booms made of special-purpose clay units are regulated in future through technical approvals. For many years masonry with non-mortared vertical joints has been the construction method mainly used in Ger-many. However, in the area of overlying masonry above flat lintels, the mortaring of the vertical joints was prescribed so far. For the first time a further new technical approval allows the execution of non-bearing overlying masonry above flat lintels with large-format clay units without mortaring of the vertical joints.
1 Introduction
In the draft of the master list of technical building regulations of September 2008 the guideline specification for flat lintels [1] dating back to 1977 is intended for deletion and is therefore facing its annulment by the building supervisory authorities.
In a working group made up of representatives from the building authorities, industry and science the guideline was revised and adjusted to the partial safety concept. Unfortunately the planned implementation in a joint guideline of the Deutsche Gesellschaft für Mauerwerkbau (DGfM) was not possible because in some cases...
Dr.-Ing. Udo Meyer
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