ＰＣ桁の残存プレストレス力推定方法

Japanese Patent JP7146192

B2

To provide a residual pre-stress force estimation method for a PC girder, whereby residual pre-stress force of the PC girder can be estimated easily and accurately.SOLUTION: In a method for estimating residual pre-stress force in a PC girder 1, in which a flexure crack 2 has arisen, strain measuring means 3 for measuring strains on a compressing side and a pulling side of the PC girder 1 and crack opening width measuring means 4 for measuring an opening width of the crack 2 are mounted. A relation between an average strain of a pulled reinforcing steel of the PC girder 1 and flexure moment or load acting on a cross-section of the PC girder 1 is obtained using measurement results from the strain measuring means 3 and the crack opening width measuring means 4. An inflection point at which this relation changes is used as an initial point of crack reopening, and flexure moment or load at the initial point of the crack reopening is used as bending moment or load. Using the flexure moment or load when the crack reopening arises, residual pre-stress force of the PC girder 1 is estimated.SELECTED DRAWING: Figure 2

Mitsuyoshi Tsunekuni
Yuichi Seshita
Kenji Kobayashi
Yoshitaka Kato
Akinobu Hirama
Kenichi Ishizuka
Hirose Tsuyoshi
Kazuaki Tobita

JP2018227665A

October 04, 2022

December 04, 2018

Click for automatic bibliography generation  

Toden Design Co., Ltd.
Tokyo University of Science
Tobishima Construction Co., Ltd.
East Japan Expressway Co., Ltd.
Expressway Research Institute Co., Ltd.

G01L1/00; E01D22/00; E04C3/26; G01L1/22; G01L1/24

JP5343463B2
JP5095258B2
JP3534659B2
JP3759144B2
JP2011180064A

Yasushi Matsunuma
Junichi Kobayashi
Kazunori Onami
Masahisa Matsumoto
Hiroyuki Matsumoto

Previous Patent: Compressor

Next Patent: MULTILAYER GAP HYDRAULIC PRESSURE MEASURING INSTRUMENT