A Pretensioned, Rocking Bridge Column System for Accelerated Construction and Enhanced Seismic Performance

Seminar | February 13 | 11 a.m.-12 p.m. | 542 Davis Hall

 Travis Thonstad

 Civil and Environmental Engineering (CEE)

A pretensioned bridge column system has been developed that accelerates on-site construction activities, minimizes residual displacements even after large seismic events and reduces post-earthquake damage. The connections are the key to the system’s seismic performance. They were tested under quasi-static conditions and found to perform exceptionally well with nearly zero strength degradation and little concrete damage, even after being loaded cyclically up to drift ratios of 10%. The restoring properties of the system were evaluated through multi-shaking table tests conducted on a quarter-scale, two-span bridge specimen. The maximum residual drift ratio during testing was 0.4%, even after excursions to drift ratios exceeding 13%. This presentation describes the system, compares its performance to that of more conventional cast-in-place construction, and describes the principles of its design.

 leorig@berkeley.edu, 510-642-1762