doi:10.3850/978-981-08-9247-0_rp073-icsas11

ABSTRACT

Strongly profiled sandwich panels for roof applications are predominantly fixed in the crest of the outer face. For the fixings, self-drilling or self-tapping screws with a sealing washer of diameter 16 mm or 19 mm are used. Unlike with trapezoidal sheeting, saddle washers are rarely used. The insulting foam core is assumed to stabilize the crest, and to help to transfer the loads from the upper flange to the webs of the outer face. It is assumed this supersedes the use of saddle washers which have the same function. A design equation is available for flat or lightly profiled sandwich panels with direct fixing, also applicable for strongly profiled panels with fixing in the trough. For crest-fixed panels, no information is available up to now. The paper will close this gap and present the results of investigations done with this type of fixing. Pull-trough tests with both static and repeated loading were performed according to the ECCS-Recommendations. Additional parametric numerical investigations were also performed, using a Finite-Element-Model allowing the study of the effect of some basic parameters such as thickness and geometry of the profiled face, material properties of face and core and washer diameter. Based on these results, basic mechanical models for the load-bearing behaviour of crest-fixings of sandwich panels were developed. Interaction of the connection with the load-bearing behavior and capacity of the panel itself (wrinkling of the exterior face) is not a subject of this paper.

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