durability evaluation of existing reinforced …...durability evaluation of existing reinforced...

名古屋工業大学大学院社会工学專攻　　　　　　　　　　　　　　　　　趙　　研究室

Durability Evaluation Durability Evaluation of of Existing Reinforced Concrete StructuresExisting Reinforced Concrete StructuresWei-Qiu ZhongWei-Qiu Zhong, , Ying-Chun Ying-Chun JJiangiang and and Yan-GangYan-Gang ZhaoZhao

System reliability analysis for R.C.structures under the attack of severalcorrosive factors, such as carbondioxide, chloride ions, sulfate, andsulfuric acid

0

0.1

0.2

0.3

0.4

0.5

0.6

0 20 40 60

Service Period (years)

Syste

m F

ail

ure P

robabil

ity Upper Bound

Lower Bound

Variable weight model for comprehensive qualityevaluation of existing R.C. structures!

=

=m

j

jij

jij

ij

xx

xxw

1

*

*

/

/

)(11,:min1

piKkëìkkk

r

iri !!"#$

%&'

!!(= )=

Grey system method for predictingremaining service life of existingR.C. structures

Performance experiments of R.C.columns with corroded rebar

Further Research Aspects

Zhao Lab. of Structural Safety , Nagoya Institute of Technology

Accelerated electrochemicalcorrosion of rebar

A practical and efficient algorithm tocalculate skeleton curves of reinforcedconcrete members with corroded rebar ispresented.

Models and expressions of the influence of corrosion extent onanti-seismic performance and reliability of R.C. structures

Models and expressions of the influence of corrosion extent onanti-fatigue performance and reliability of R.C. structures

Bearing capacity, rigidity,ductility and energydissipation characteristicsof members are analyzed.

The goal of structural design is to ensure appropriatesafety, serviceability, durability and economy ofstructures. Durability evaluation of existing R.C.structures is an important part of research ondurability of R.C. structures.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 10 20 30 40 50 60

Service Period (years)

Str

uctu

ral

Dam

age I

ndex Predicted

Givena

ue

a

uxkx

ak+!=+

!])1([)1(ˆ )0()1(

)(ˆ)1(ˆ)1(ˆ )1()1()0(kxkxkx !+=+

Dynamic performance and reliability of R.C. structures in corrosive environment