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FRP-to-concrete bond behaviour under high strain rates

หน่วยงาน Edinburgh Research Archive, United Kingdom

รายละเอียด

ชื่อเรื่อง : FRP-to-concrete bond behaviour under high strain rates
นักวิจัย : Li, Xiaoqin
คำค้น : FRP , Fibre reinforced polymer , concrete , bond-slip , DIF , dynamic increasing factor , strain rate
หน่วยงาน : Edinburgh Research Archive, United Kingdom
ผู้ร่วมงาน : Chen, Jian-Fei , Lu, Yong , Engineering and Physical Sciences Research Council (EPSRC)
ปีพิมพ์ : 2555
อ้างอิง : http://hdl.handle.net/1842/6234
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Li, X.Q., Yang, Z.J., Chen, J.F. and Lu, Y. (2011), "Loading rate effect on FRP-toconcrete bond behaviour", International Conference on Civil Engineering, Advanced Materials Research, Vols.250 (2011):3571-3576. , Li, X.Q., Chen, J.F. and Lu, Y. (2010), "Meso-scale modelling of FRP-to-concrete bond behaviour using LSDYNA", Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, September 27-29, Beijing, China: 494-498. , Li, X.Q., Chen, J.F. and Lu, Y. (2010), "On mode-I fracture modelling of concrete in LS-DYNA explicit", Proceedings (CD-ROM) of the 13th International Conference on Structural Faults + Repair, June 15-17, Edinburgh, UK.
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Fibre reinforced polymer (FRP) composites have been used for strengthening concrete structures since early 1990s. More recently, FRP has been used for retrofitting concrete structures for high energy events such as impact and blast. Debonding at the FRP-to-concrete interface is one of the predominant failure modes for both static and dynamic loading. Although extensive research has been conducted on the static bond behaviour, the bond-slip mechanics under high strain rates is not well understood yet. This thesis is mainly concerned with the FRP-to-concrete bond behaviour under dynamic loading. Because debonding mostly occurs in the concrete adjacent to the FRP, the behaviour of concrete is of crucial importance for the FRP-to-concrete bond behaviour. The early emphasis of this thesis is thus on the meso-scale concrete modelling of concrete with appropriate consideration of static and dynamic properties. Issues related to FE modelling of tensile and compressive localization of concrete are first investigated in detail under static condition using the K&C concrete damage model in LS-DYNA. It is discovered for the first time that dilation of concrete plays an important role in the FRP-to-concrete bond behaviour. This has led to the development of a model relating the shear dilation factor to the concrete strength based on the modelling of a large number of static FRP-to-concrete shear tests, forming the basis for dynamic modelling. Concrete dynamic increasing factor (DIF) has been a subject of extensive investigation and debate for many years, but it is for the first time discovered in this study that mesh objectivity cannot be achieved in meso-scale modelling of concrete under high strain rate deformation. This has led to the development of a mesh and strain rate dependent concrete tension DIF model. This DIF model shall have wide applications in meso-scale modelling of concrete, not limited to the topic in this thesis. Based on a detailed numerical investigation of the FRP-to-concrete bond shear test under different loading rates, taking on the above issues into careful consideration, a slip rate dependent FRP-to-concrete dynamic bond-slip model is finally proposed for the first time. The FE predictions deploring this proposed bond-slip model are compaed with test results of a set of FRP-to-concrete bonded specimens under impact loading, and a FRP plated slab under blast loading, validating the model.

บรรณานุกรม :
Li, Xiaoqin . (2555). FRP-to-concrete bond behaviour under high strain rates.
    กรุงเทพมหานคร : Edinburgh Research Archive, United Kingdom .
Li, Xiaoqin . 2555. "FRP-to-concrete bond behaviour under high strain rates".
    กรุงเทพมหานคร : Edinburgh Research Archive, United Kingdom .
Li, Xiaoqin . "FRP-to-concrete bond behaviour under high strain rates."
    กรุงเทพมหานคร : Edinburgh Research Archive, United Kingdom , 2555. Print.
Li, Xiaoqin . FRP-to-concrete bond behaviour under high strain rates. กรุงเทพมหานคร : Edinburgh Research Archive, United Kingdom ; 2555.