143

NAShell

12.14 (94.55%)

7.36 (98.79%)

1.36 (95.10%)

Built-in fixed supporta

6.15 (47.90%)

N/A

N/A

Roller simply supportb

8.99 (70.02%)

N/A

N/A

a Lateral deflection and rotation are fixed. Lateral deflection is fixed but free to rotate.

Note: Values in parentheses refer to the ratio of the deflections to the measured deflections in the test.

a Lateral deflection and rotation are fixed. Lateral deflection is fixed but free to rotate.

Note: Values in parentheses refer to the ratio of the deflections to the measured deflections in the test.

From Table 29.3, we can see that we have underestimated the glass deflection of the glass plate if we consider that the glass plate is fixed support (in rotation and translation) or even simply support (restrained only in translation). The actual deflection of the glass is about double in the case of fixed support and about 1.4 times in the case of simply support. On the other hand, we observe that the deflections obtained by NAShell are close to those in the mock-up test, and the errors in the prediction of deflections are acceptable in engineering practice. The underestimation of deflection would probably increase the chance of contact with hard objects such as a concrete wall behind the glass and hence increase the failure rate. Deflection limit for serviceability requirement is normally taken as one-sixtyth of shorter span.

0 0

Post a comment