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He M.-H.,Tsinghua University | He M.-H.,Key Laboratory for Civil Engineering Safety and Durability of Education Ministry | Xin K.-G.,Tsinghua University | Xin K.-G.,Key Laboratory for Civil Engineering Safety and Durability of Education Ministry | And 2 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2012

In order to minimize post-earthquake residual structural deformation, to enhance seismic self-centering ability of bridge structures and to promote the continuous service condition with limited repair or even without retrofit, a series of new concepts of self-centering bridge pier joints has been presented. Based on a typical self-centering bridge pier joint structure, some mechanical factors including the flexural strength, hysteretic characteristics, working characters and control parameters have been derived and analyzed. The proposed joint that constrains the minimum potential position of the system, can help the structure reset. The paper shows that the unambiguous mechanical system of self-centering bridge pier joint has little post-earthquake residual deformation, prevents the elastic strength from weakening and holds the flexibility for construction, which can better satisfy more rigorous seismic requirements for next generation bridge system. Source


Guo J.,Tsinghua University | Guo J.,Key Laboratory for Civil Engineering Safety and Durability of Education Ministry | Xin K.-G.,Tsinghua University | Xin K.-G.,Key Laboratory for Civil Engineering Safety and Durability of Education Ministry | And 4 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2012

This paper presents a self-centring bridge pier system connected by unbonded post-tensioned tendons and mild steel which can minimize the post-earthquake residual deformation and displays stable energy dissipate capacity. The basic mechanical concept of a self-centring system is explained. Referring to the quasi-static test, a simplified mechanical model and a finite element model is herein illustrated, considering flexural deformation, unbonded length of mild steel and strain penetration due to strain differences between the bar and concrete within the connection member. To solve the stress of concrete, two alternative methods, the equivalent rectangular stress map method and plane-section assumption method, are also critically discussed for better understanding of the principle of a self-centring system. Moreover, to provide a guide for structure design, the author indicates the intrinsic characteristic of the stiffness of a self-centring bridge pier which could result in vibration isolation. Source

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