کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6480746 1428764 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Withdrawal resistance of screws in structural composite lumber made of poplar (Populus deltoides)
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Withdrawal resistance of screws in structural composite lumber made of poplar (Populus deltoides)
چکیده انگلیسی


- Withdrawal resistance of screw in SCL was affected by screw type and characteristics.
- Different failure modes were observed in SCLs.
- The failure of screws timber joints is mainly due to shear stress.
- The larger diameter of screw, the higher withdrawal resistance.

Withdrawal resistance of screws on face, edge and end directions of oriented strand lumber (OSL), laminated veneer lumber (LVL) and plywood made out of poplar (Populus deltoides) were experimentally evaluated. Two types of screws, namely, drywall screw and sheet metal screw in two different diameters (4 and 5 mm) were evaluated. The results obtained were compared with those of solid poplar wood and the failure modes of specimens were visually examined. Test results showed that: (1) OSL joints were stronger than same joints constructed of LVL, plywood and poplar wood; (2) screw diameter positively influenced on withdrawal resistance, and its effects on withdrawal load were more influenced by root diameter of the screws and grain direction; (3) due to increased root diameter, sheet metal screw had significantly higher withdrawal resistance than drywall screw; (4) perpendicular to the grain direction (face and edge) were higher compared to the results for the parallel to the grain direction (end). However, there was no significant difference between OSL and poplar wood for maximum withdrawal resistance when the screw is either inserted in the edge or end-grain surface withdrawal directions; (5) the experimental results of failure modes included the plug shear failure around the screw of end direction, a rolling shear failure or tension axial stresses perpendicular to the grain of edge direction and splitting failure of the superficial fiber layer of the block of face direction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 142, 1 July 2017, Pages 499-505
نویسندگان
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