An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products
Self-tapping screws are becoming increasingly popular for use in modern timber structures. The axial stress distribution of self-tapping screws due to a mechanical load has been previously studied. However, the stress distribution of self-tapping screws due to moisture swelling-induced load from woo...
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MDPI AG
2025-04-01
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| author | Mehsam Tanzim Khan Sara Keypoursangsari Chun Ni Ying Hei Chui Zengtao Chen |
| author_facet | Mehsam Tanzim Khan Sara Keypoursangsari Chun Ni Ying Hei Chui Zengtao Chen |
| author_sort | Mehsam Tanzim Khan |
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| description | Self-tapping screws are becoming increasingly popular for use in modern timber structures. The axial stress distribution of self-tapping screws due to a mechanical load has been previously studied. However, the stress distribution of self-tapping screws due to moisture swelling-induced load from wood has not been explored so far. This research presents an analytical model to predict the axial stress distribution in self-tapping screws embedded in mass timber products under the combined effects of axial mechanical loading and wood moisture-induced swelling. The analytical model has been validated with numerical simulation. The input properties of the analytical model can be determined from withdrawal tests of self-tapping screws and the manufacturer’s guide of screw and mass timber products. A simple program has been developed to predict the stress distribution and maximum axial stress in self-tapping screws for a range of effective penetration lengths under a pre-load and moisture content change. Correctly predicting the maximum axial stress in self-tapping screws under the simultaneous action of a pre-load and wood moisture swelling-induced load can help design safer timber structures. This research provides a practical method for practicing engineers to predict the maximum axial stress in self-tapping screws due to pre-load and wood moisture swelling. |
| format | Article |
| id | doaj-art-8ffccdbf19904479803d57b3d7f767d3 |
| institution | DOAJ |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Buildings |
| spelling | doaj-art-8ffccdbf19904479803d57b3d7f767d32025-08-20T03:14:21ZengMDPI AGBuildings2075-53092025-04-01158129710.3390/buildings15081297An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber ProductsMehsam Tanzim Khan0Sara Keypoursangsari1Chun Ni2Ying Hei Chui3Zengtao Chen4Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USADepartment of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2E1, CanadaBuilding Systems, FPInnovations, Vancouver, BC V6T 1Z4, CanadaDepartment of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2E1, CanadaDepartment of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2E1, CanadaSelf-tapping screws are becoming increasingly popular for use in modern timber structures. The axial stress distribution of self-tapping screws due to a mechanical load has been previously studied. However, the stress distribution of self-tapping screws due to moisture swelling-induced load from wood has not been explored so far. This research presents an analytical model to predict the axial stress distribution in self-tapping screws embedded in mass timber products under the combined effects of axial mechanical loading and wood moisture-induced swelling. The analytical model has been validated with numerical simulation. The input properties of the analytical model can be determined from withdrawal tests of self-tapping screws and the manufacturer’s guide of screw and mass timber products. A simple program has been developed to predict the stress distribution and maximum axial stress in self-tapping screws for a range of effective penetration lengths under a pre-load and moisture content change. Correctly predicting the maximum axial stress in self-tapping screws under the simultaneous action of a pre-load and wood moisture swelling-induced load can help design safer timber structures. This research provides a practical method for practicing engineers to predict the maximum axial stress in self-tapping screws due to pre-load and wood moisture swelling.https://www.mdpi.com/2075-5309/15/8/1297mass timber productsmoisture swellingself-tapping screwCLTglulam |
| spellingShingle | Mehsam Tanzim Khan Sara Keypoursangsari Chun Ni Ying Hei Chui Zengtao Chen An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products Buildings mass timber products moisture swelling self-tapping screw CLT glulam |
| title | An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products |
| title_full | An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products |
| title_fullStr | An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products |
| title_full_unstemmed | An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products |
| title_short | An Analytical Model for Predicting the Axial Stress Distribution of Self-Tapping Screws Due to Axial Load and Moisture Swelling of Mass Timber Products |
| title_sort | analytical model for predicting the axial stress distribution of self tapping screws due to axial load and moisture swelling of mass timber products |
| topic | mass timber products moisture swelling self-tapping screw CLT glulam |
| url | https://www.mdpi.com/2075-5309/15/8/1297 |
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