Proposed Modification of AASHTO-LRFD for Computing Stress in Unbonded Tendons at Ultimate

Autor:	Mohamad H. Harajli
Rok vydání:	2011
Předmět:	Stress (mechanics) Engineering business.industry Building code Building and Construction Structural engineering business Load factor Expression (mathematics) Civil and Structural Engineering Test data
Zdroj:	Journal of Bridge Engineering. 16:828-838
ISSN:	1943-5592 1084-0702
DOI:	10.1061/(asce)be.1943-5592.0000183
Popis:	In 1998, AASHTO-LRFD adopted a new equation for evaluating the stress fps in unbonded tendons at ultimate. In explaining the development and applicability of the new AASHTO-LRFD equation, some investigators concluded that the new equation is conservative and more rational when compared with the ACI building code approach for computing fps. However, in a comprehensive study carried out by the writer, it was found that while the AASHTO-LRFD equation is indeed more rational than the ACI building code approach because it accounts for continuous members, it still encounters significant scatter in predicting test data. Also, using conservative collapse mechanisms that involve loading a single span in a multispan member for all loading cases as proposed in AASHTO-LRFD leads to design inconsistencies. Based on the results of this assessment, supported by a large body of test data, an expression for evaluating the equivalent plastic-hinge length in unbonded members at ultimate was developed. The corresponding expr...
Databáze:	OpenAIRE
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