Screw-press gluing in timber construction – press force predictions and application limits
Screw-press gluing is a highly efficient and often the exclusive possibility to join components of ribbed wooden elements and for plate or strip type reinforcement of timber structures. This paper deals with the magnitude of the press force exerted by the head of partially threaded screws then balan...
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Elsevier
2025-09-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S259012302502568X |
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| author | Simon Aicher Aaron Münzer Kai Simon |
| author_facet | Simon Aicher Aaron Münzer Kai Simon |
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| description | Screw-press gluing is a highly efficient and often the exclusive possibility to join components of ribbed wooden elements and for plate or strip type reinforcement of timber structures. This paper deals with the magnitude of the press force exerted by the head of partially threaded screws then balanced by the screw’s withdrawal and torque capacity which is decisive for the clamping pressure. The investigations comprised screw diameters of 5 to 10 mm with countersunk and flange-type head diameters up to 30 mm. Four sheathing materials were included: Spruce solid timber, cross-layered laminated veneer lumber from spruce and hardwood plywood made of birch and beech wood. The base material was throughout glued-laminated timber from spruce. The screw force was determined by two methods being (i) head pull-through tests, coarsely aligned with EN 1383, and (ii) drill-in experiments with simultaneous measurement of applied torque, press force and screw head indentation. A good agreement of both test methods with regard to press force was obtained and described by multi-variable regressions. For practical application simple press force predictions based on screw head diameter were derived relying on mean values rather than 5 %-quantiles stipulated too conservative in the European timber structures execution standard FprEN1995–3. Screw-press gluing of hardwood sheathings with flange head fasteners should be excluded from application due to observed predominant screw torque ruptures or spinning loose failures. These features are attributed to exceedance of the torsional resistance or withdrawal capacity of the screw already within the very first millimeters of indentation. |
| format | Article |
| id | doaj-art-af09e12d34c0446b92c22f6c43e7b77f |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
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| series | Results in Engineering |
| spelling | doaj-art-af09e12d34c0446b92c22f6c43e7b77f2025-08-20T04:02:23ZengElsevierResults in Engineering2590-12302025-09-012710649910.1016/j.rineng.2025.106499Screw-press gluing in timber construction – press force predictions and application limitsSimon Aicher0Aaron Münzer1Kai Simon2Corresponding author.; Department of Timber Constructions, University of Stuttgart, Materials Testing Institute, Pfaffenwaldring 4b, Stuttgart 70569, GermanyDepartment of Timber Constructions, University of Stuttgart, Materials Testing Institute, Pfaffenwaldring 4b, Stuttgart 70569, GermanyDepartment of Timber Constructions, University of Stuttgart, Materials Testing Institute, Pfaffenwaldring 4b, Stuttgart 70569, GermanyScrew-press gluing is a highly efficient and often the exclusive possibility to join components of ribbed wooden elements and for plate or strip type reinforcement of timber structures. This paper deals with the magnitude of the press force exerted by the head of partially threaded screws then balanced by the screw’s withdrawal and torque capacity which is decisive for the clamping pressure. The investigations comprised screw diameters of 5 to 10 mm with countersunk and flange-type head diameters up to 30 mm. Four sheathing materials were included: Spruce solid timber, cross-layered laminated veneer lumber from spruce and hardwood plywood made of birch and beech wood. The base material was throughout glued-laminated timber from spruce. The screw force was determined by two methods being (i) head pull-through tests, coarsely aligned with EN 1383, and (ii) drill-in experiments with simultaneous measurement of applied torque, press force and screw head indentation. A good agreement of both test methods with regard to press force was obtained and described by multi-variable regressions. For practical application simple press force predictions based on screw head diameter were derived relying on mean values rather than 5 %-quantiles stipulated too conservative in the European timber structures execution standard FprEN1995–3. Screw-press gluing of hardwood sheathings with flange head fasteners should be excluded from application due to observed predominant screw torque ruptures or spinning loose failures. These features are attributed to exceedance of the torsional resistance or withdrawal capacity of the screw already within the very first millimeters of indentation.http://www.sciencedirect.com/science/article/pii/S259012302502568XScrew-press gluingPartially threaded timber screwsPress forceHead pull-throughHardwood sheathings |
| spellingShingle | Simon Aicher Aaron Münzer Kai Simon Screw-press gluing in timber construction – press force predictions and application limits Results in Engineering Screw-press gluing Partially threaded timber screws Press force Head pull-through Hardwood sheathings |
| title | Screw-press gluing in timber construction – press force predictions and application limits |
| title_full | Screw-press gluing in timber construction – press force predictions and application limits |
| title_fullStr | Screw-press gluing in timber construction – press force predictions and application limits |
| title_full_unstemmed | Screw-press gluing in timber construction – press force predictions and application limits |
| title_short | Screw-press gluing in timber construction – press force predictions and application limits |
| title_sort | screw press gluing in timber construction press force predictions and application limits |
| topic | Screw-press gluing Partially threaded timber screws Press force Head pull-through Hardwood sheathings |
| url | http://www.sciencedirect.com/science/article/pii/S259012302502568X |
| work_keys_str_mv | AT simonaicher screwpressgluingintimberconstructionpressforcepredictionsandapplicationlimits AT aaronmunzer screwpressgluingintimberconstructionpressforcepredictionsandapplicationlimits AT kaisimon screwpressgluingintimberconstructionpressforcepredictionsandapplicationlimits |