Masters Theses


Seismic upgrade of CISS column shaft-bent caps connections

Keywords and Phrases

Cast in place steel shell (CISS)


"Based on an experimental study, this paper presents an upgrade method for improving the seismic performance of typical bridges built in the state of Alaska. Three specimens consisting of a cast in place steel shell (CISS) column foundation shaft and a bent cap configured to form a tee connection were built to model a typical bridge bent and tested under simulated seismic loads. Each specimen was retrofitted in the column, bent cap, and their connection according to current seismic design standards in order to ensure a ductile performance under the applied loads. In all the test units, the main failure mode was characterized by strength degradation of the columns due to joint shear failure beyond a displacement ductility capacity of 6. Based on this information, the research team suggests that a limiting force reduction factor of 4 be employed in retrofit design using any of the upgrade details discussed in this paper. Furthermore, this research program studied the feasibility of the upgrade method for direct implementation in the field. This paper presents the test results, design philosophy, and recommendations fur further research in order to improve the proposed retrofit scheme"--Abstract, page iv.


Silva, Pedro Franco

Committee Member(s)

Chen, Genda
Carroll, Douglas R.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


Alaska. Department of Transportation and Public Facilities
United States. Department of Transportation


University of Missouri--Rolla

Publication Date

Spring 2006


x, 62 pages

Note about bibliography

Includes bibliographical references.

Geographic Coverage



© 2006 Michael Christopher Lubiewski, All rights reserved.

Document Type

Thesis - Citation

File Type




Subject Headings

Bridges -- Foundations and piers -- Alaska
Columns, Concrete -- Earthquake effects -- Testing
Concrete bridges -- Earthquake effects -- Alaska
Piling (Civil engineering)

Thesis Number

T 8932

Print OCLC #


Link to Catalog Record

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