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Wei Y.,Nanjing Forestry University | Wei Y.,International Institute for Urban Systems Engineering | Wei Y.,Chongqing Jiaotong University | Wu G.,International Institute for Urban Systems Engineering | And 3 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2010

The failure modes of reinforced concrete columns have an important effect on its ductility and seismic performance. Test results show that the failure modes of RC rectangular columns can be changed by FRP-reinforced. With different amount of FRP strengthening, the brittle shear failure may be changed to ductile shear failure or bending failure. The predict method of FRP-reinforced RC column failure models were present through the relative relationship between its flexural capacity curve and the shear skeleton curve. If the intersection of two curves is located in the degradation part of the shear strength curve, then the ductile shear failure occurs; if the two curves can not intersect, then the ductile flexural failure occurs. Results showed that the method is feasible. Source

Shi J.,Nanjing Southeast University | Wu Z.,Nanjing Southeast University | Wu Z.,International Institute for Urban Systems Engineering | Wang X.,International Institute for Urban Systems Engineering | And 3 more authors.
Structure and Infrastructure Engineering | Year: 2015

This paper presents a study on the reliability analysis of intermediate crack-induced (IC) debonding failure, which is a dominant failure mode in concrete members strengthened with externally bonded fibre-reinforced polymer composites. First, the probabilistic characteristics of the model uncertainties for several typical IC debonding models are evaluated and presented, based on a comprehensive test database that contained 217 specimens that experienced IC debonding failure. Second, a Monte Carlo simulation analysis is performed to examine the variability in the IC debonding resistance considering the scatterness of different design variables. Subsequently, the reliability index is estimated by utilising the reliability analysis method, first-order reliability method, for each design case. The effect of each design variable on the average reliability index is examined. Finally, reduction factors for the investigated IC debonding models are calibrated based on the reliability analysis with the aim of meeting a target reliability index of 3.5. © 2015, © 2014 Taylor & Francis. Source

Wu Z.,International Institute for Urban Systems Engineering | Wu Z.,Ibaraki University | Wang X.,International Institute for Urban Systems Engineering | Wu G.,International Institute for Urban Systems Engineering
Proceedings of the 6th International Conference on FRP Composites in Civil Engineering, CICE 2012 | Year: 2012

Basalt fiber composites (BFRP) have been receiving increasing attention in civil infrastructures, due to their excellent mechanical and chemical properties and high cost-performance. This paper reviews the recent achievements in advancing structural safety and sustainability by BFRP composites based on the research conducted by the authors' research team. The major research consists of the advancement of basalt fibers through enhancing production techniques, the fundamental study of BFRP under static and cyclic loading, high temperature and severe environment and the common application directly by BFRP products. To further pursue the advantages of BFRP and its application in safe and sustainable structures, the advancement of BFRP composites through hybridization with other materials is also addressed. Based on the advancement in BFRP composites, the innovative application techniques of BFRP in civil infrastructures are further introduced, including smart structures with BFRP smart bars, long-span bridges with hybrid BFRP cables, the prestressed concrete structures with pre-tensioned BFRP sheets, damage controllable and recoverable structures with SFCB, and the sustainable structures with BFRP profiles. Finally, some new directions of research and future application for the enhancement of structural safety and sustainability are proposed. © International Institute for FRP in Construction (IIFC). Source

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