Structural design of float glass elements is performed as a rule with the semiprobabilistic approach by defining partial factors for glass trength, calibrated with full probabilistic methods on paradigmatic case-studies. Although the most used statistics for float-glass strength is the 2-parameter Weibull’s (2PW), we show that it fails to interpret the left-hand-side tail of the population of experimental data, associated with small failure probabilities. The tails govern the calibration of partial factors, since the probability of failure admitted for a construction work are very small; but the 2PW statistics leads to a very conservative design. Contrariwise, from experiments a lower bound for float-glass strength, attributable to modern factory production controls, is recognizable. Moreover, we show through modelling that corrosion/abrasion do not imply the decay of strength below a certain limit, thus inducing a lower dispersion in the data. Therefore, we propose to use generalized Weibull statistics, among which the left-truncated Weibull distribution, to better interpret the tail of the population. Partial material factors calibrated with the novel approach are considerably lower than with the 2PW statistics. Noteworthy savings can be achieved with this refined statistical approach to interpret float-glass strength.

Is current sizing of float glass structures too much conservative? / Pisano, Gabriele; Royer Carfagni, Gianni. - STAMPA. - (2017), pp. -147. ((Intervento presentato al convegno GPD 2017 All eyes on glass. Glass Performance days 2017 tenutosi a Tampere nel June 28-30 2017.

Is current sizing of float glass structures too much conservative?

Pisano, Gabriele;Royer Carfagni, Gianni
2017-01-01

Abstract

Structural design of float glass elements is performed as a rule with the semiprobabilistic approach by defining partial factors for glass trength, calibrated with full probabilistic methods on paradigmatic case-studies. Although the most used statistics for float-glass strength is the 2-parameter Weibull’s (2PW), we show that it fails to interpret the left-hand-side tail of the population of experimental data, associated with small failure probabilities. The tails govern the calibration of partial factors, since the probability of failure admitted for a construction work are very small; but the 2PW statistics leads to a very conservative design. Contrariwise, from experiments a lower bound for float-glass strength, attributable to modern factory production controls, is recognizable. Moreover, we show through modelling that corrosion/abrasion do not imply the decay of strength below a certain limit, thus inducing a lower dispersion in the data. Therefore, we propose to use generalized Weibull statistics, among which the left-truncated Weibull distribution, to better interpret the tail of the population. Partial material factors calibrated with the novel approach are considerably lower than with the 2PW statistics. Noteworthy savings can be achieved with this refined statistical approach to interpret float-glass strength.
978-952-5836-06-6
Is current sizing of float glass structures too much conservative? / Pisano, Gabriele; Royer Carfagni, Gianni. - STAMPA. - (2017), pp. -147. ((Intervento presentato al convegno GPD 2017 All eyes on glass. Glass Performance days 2017 tenutosi a Tampere nel June 28-30 2017.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2838464
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