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Direct evaluation
of the modification coefficient $k_{\mathrm{mod}}$ for the
static-fatigue design of annealed glass panes under wind
load
Stefano Vozzella, Claudio Boni, Roberta Massabò and Gianni Royer-Carfagni |
|
Vol. 20 (2025), No. 3, 289–313
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Abstract |
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Most standards reduce the design strength of glass through a modification coefficient that accounts for static fatigue caused by subcritical propagation of surface cracks. For wind pressures on glass plates, the coefficient is derived assuming nominal durations of maximum wind gusts or cumulative winds, which are defined based on tradition and practice. Here we derive closed-form expressions for the modification coefficient using a fracture mechanics approach which incorporates the time histories of wind velocity or their probabilistic distributions. The coefficient depends on the duration of the action and becomes constant for typical design lives. A consistent nominal duration is then defined by referring to a wind with fixed reference velocity which produces the same damage of the actual action. The approach, applicable to the European context, has been applied to data recorded in Italy. The results are compared with prescriptions from various standards showing that they are in general non-conservative. |
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Keywords
annealed glass, wind action, subcritical crack propagation,
static fatigue design, probabilistic mechanics
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Milestones
Received: 3 March 2025
Revised: 10 July 2025
Accepted: 21 July 2025
Published: 2 September 2025
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Authors |
| Stefano Vozzella | |
| Department of Civil, Chemical and
Environmental Engineering University of Genova 16145 Genova Italy |
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| Claudio Boni | |
| Department of Civil, Chemical and
Environmental Engineering University of Genova 16145 Genova Italy |
|
| Roberta Massabò | |
| Department of Civil, Chemical and
Environmental Engineering University of Genova 16145 Genova Italy |
|
| Gianni Royer-Carfagni | |
| Department of Systems Engineering
and Industrial Technologies University of Parma 43124 Parma Italy |
Construction Technologies
Institute Italian National Research Council (ITC-CNR) 20098 San Giuliano Milanese, Milano Italy |
| © 2025 MSP (Mathematical Sciences Publishers). |
