01626711

Component

This paper presents the shake-table test of a proposed damage-resistant segmental double-skin bridge column with post-tensioned unbonded strands and external energy dissipaters. It compares the response to that of a conventional reinforced concrete (RC) column under the same conditions. The cross section is a double skin section composed of an outside glass fiber reinforced polymer tube (GFRP), an inside steel tube, and concrete cast in between the two. External energy dissipaters in the form of A36 steel bars were utilized. The column combines the advantages of accelerated bridge construction and self centering due to rocking with high energy dissipation from the steel bars. Both columns were subjected to a sequence of scaled near-fault pulse-like ground motions. The double-skin segmental column sustained no noticeable damage and no residual drift after the sequence of motions up to 250% of the design earthquake, which caused a peak drift ratio of 8.85%. On the other hand, the counterpart conventional column suffered severe damage with rebar fracture and extensive concrete spalling. The accumulated residual drift of the conventional column was 1.5% after the sequence of motions up to 200% of the design earthquake, which caused a peak drift ratio of 4.8%. The energy dissipated by the segmental column was close to that of the conventional RC column along the tests.

This paper was sponsored by TRB committee AFF50 Standing Committee on Seismic Design and Performance of Bridges.

01618707

17-04658

English

13p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; Photos; References

Bars (Building materials); Bridge design; Columns; Dissipation; Earthquake resistant design; Fiber reinforced polymers; Posttensioning; Reinforced concrete; Seismicity; Tubing

Bridges and other structures; Design; Highways; Materials

Transportation Research Board Annual Meeting 2017 Paper #17-04658

TRIS, TRB, ATRI

Dec 8 2016 11:47AM