Discussion of 'Discussion on AASHTO LRFD Load Distribution Factors for Slab-on-Girder Bridges' by C. S. Cai
| Autor: | Peter Kocsis |
|---|---|
| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Practice Periodical on Structural Design and Construction. 11:247-248 |
| ISSN: | 1943-5576 1084-0680 |
| DOI: | 10.1061/(asce)1084-0680(2006)11:4(247) |
| Popis: | The author has presented a way of combining the tables in the LRFD code into a single table, making the calculation of load distribution factors a much simpler task. Further simplification can be obtained by using what is known as Henry’s method Huo et al. 2004. Henry’s method was developed by Henry Derthick, a former engineer of the Structures Division of the Tennessee Department of Transportation TDOT. Henry’s method has been in use in Tennesse since 1963. TDOT design guides specify that the designer should use the smaller of the lateral distribution factors found by: AASHTO standard formulas AASHTO 1996 or Henry’s method. Huo et al. 2004 lists 24 bridges, of which 21 were designed by Henry’s method. No negative reports were received on the design and service of the primary members. The standard AASHTO formulas can result in highly unsafe results more than 40% and highly conservative results more than 50%AASHTO l994, p. 21. It would therefore be safer to avoid using the AASHTO standard formulas. In Table 4 of the original paper, the AASHTO standard values range from 17 to 42% over the measured values. Table 1 of this discussion shows that both Henry’s method and the finite-element method give distribution factors that are closer to the measured values than the AASHTO LRFD AASHTO 1998 and the proposed method. The accuracy, simplicity and proven track record of Henry’s method make it the clear choice for calculating distribution factors. The text below is a direct quote from Huo et al. 2004. “Henry’s Method |
| Databáze: | OpenAIRE |
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