摘要(英) |
Recently, repair and
retrofit using CFRP of high strength in Civil Engineering Construction
is already developed and applied in relative theory and construction
around the world. However, the research of retrofit wooden structure
using CFRP is not much. The study in durability aspect is less and
moreover, has not proceeded appropriately. This research
is to discuss the durability of retrofit wooden members using CFRP. In
order to assure the durability, wooden member specimens(cryptomeria
japonica)wrapped CFRP sheets which were subjected to two different
environments including sea water dry-wet cycling and freeze-thaw cycling
were tested on surface hardness, SEM observation, pull-out strength,
compressive shear strength, compressive strength and flexural strength
tests. After the above environment conditions and tests, the evaluation
of the effect and the durability of wooden members wrapped with CFRP
sheets can be made. Finally, bending and full-size compressive specimens
were painted two layers resin but don’t run the environment test.
Throughout the test, it can compare if the wooden members painted two
layers resin before wrapping with CFRP will increase the effect of
retrofit. Results show that wooden members wrapped with
CFRP can increase strength, especially when painting two layers resin.
After environment test, it shows good bonding between wooden members and
CFRP. And strength of compressive shear, compressive or flexural
specimens does not decrease by retrofitting layers but decrease strength
of pull-out or compressive shear ones. |