Ye Lieping

Engineering practice of seismic isolation and energy dissipation structures in China

The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s. In China, the first seismic isolation structure was finished in 1993, and the first energy dissipation structure was built at about the same time. Up to 2007, China had more than 600 seismic isolation and about 100 energy dissipation building structures. In 2008, the huge Wenchuan earthquake hit the southwest of China, which triggered a bloom of new seismic isolation and energy dissipation structures. This paper presents the development history and representative applications of seismic isolation and energy dissipation structures in China, reviews the state-of-the-practice of Chinese design, and discusses the challenges in the future applications. Major findings are as follows: Basic design procedures are becoming standardized after more than ten years of experiences, which mainly involve determination of design earthquake forces, selection of ground motions, modeling and time-history analyses, and performance criteria. Nonlinear time-history analyses using multiple ground motions are the characteristic of the design of seismic isolation and energy dissipation structures. Regulations, standardization and quality control of devices, balance between performance and cost, comparison with real responses, and regular inspection are identified as the issues that should be improved to further promote the application of seismic isolation and energy dissipation structures in China.

Experimental Study on Behavior of FRP Anti-Buckling Strengthening Steel Members

This paper puts forward a thought of a FRP (Fiber Reinforced Polymer) anti-buckling strengthening of steel members. Through compression tests of 14 specimens, the influence of slenderness ratio, binding (filled or not filled), fillers, as well as connection methods to the core steel compression performance was studied. The results show that the reinforcement changes the ultimate failure mode of the specimen, and increases the ultimate bearing capacity and ductility to varying degrees. It is worthy of further research and has the value of promotion in practice.