Online Archiv

September 2, 2010 16:00 - 18:30

Empa, Dübendorf, Theodor-Erismann-Auditorium, VE102

Speakers

Prof. Dr M. “Saiid” Saiidi, Dept. of Civil & Environmental Engineering, Univ. of Nevada Reno USA

Leadership of diskussion

Prof. Dr Masoud Motavalli

Content

While precast bridges have been constructed in areas of low seismicity to satisfy the goals of termed accelerated bridge construction ABC, they have not been utilized extensively in highly seismic areas because of uncertainties about the seismic performance and energy dissipation of connections and plastic hinges in precast bridges. A study has been in progress at the University of Nevada, Reno (UNR) to develop segmental and precast columns that are able to dissipate energy while minimizing damage under strong earthquakes. A variety of details including fiber-reinforced polymer tubes and wrappings, engineered cementitious composites, and innovative steel hinge connections had been studied through shake table testing and analytical studies of large scale models of columns, piers, and a 4-span bridge. To improve serviceability and performance of bridges, a study on the performance of reinforced concrete members utilizing superelastic shape memory alloys (SMA) bars in lieu of steel reinforcement has been in progress at UNR in the past nine years. Simple beam-column systems and a 110ft. long, 4-span bridge model made using SMA-reinforcement were tested on shake tables to simulate earthquakes. The study is part of an extensive study funded by the National Science Foundation, Network for Earthquake Engineering Simulation (NEES) Research. The presentation will discuss the ABC research and evolution of research leading to the 4-span bridge model test and summarize the highlights of the bridge model performance, analytical studies, and the relative performance of different details.

The language of the presentation is English
Free entrance, guests are welcome

Following this presentation,
a tour through the Empa Structural Engineering Laboratory is offered, including two demonstrations as follows:
- Structural Health Monitoring using Wireless Sensor Networks
- Non-Destructive Testing of Bridge Cables

Followed by an Apéro