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Effective prestress forecast of PC beam based on dynamic performance(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2009年06期
Page:
37-40
Research Field:
Publishing date:
2009-12-20

Info

Title:
Effective prestress forecast of PC beam based on dynamic performance
Author(s):
LIU Ling-jia; HE Shuan-hai; ZHAO Xiao-xing
Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang’an University,Xi’an 710064,Shaanxi,China
Keywords:
bridge engineering;  simplysupported beam;  vibration frequency;  effective prestress;  posttensioning method
PACS:
U441.5
DOI:
-
Abstract:
In order to forecast the effective prestress in the existing prestressed concrete bridges, the longitudinal prestress was enforced on the scaled model simplysupported beams with different section types, strand arrangement patterns and material characteristics, then the frequencies and mode shapes of the beams were tested. The results indicated that the influence of prestress on the fundamental frequency is related with the tendon arrangement pattern, and the fundamental frequency depends on the section type, material characteristics and the tendon eccentricity. Based on the test data, a regression function between the effective prestress and rigidity is conducted, and a method for forecasting the effective prestress of PC simplysupported beam is presented. 6 figs, 8 refs.

References:

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Memo

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Last Update: 2009-12-20