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Project Details
STATUS

Completed

START DATE

06/01/85

END DATE

12/31/86

RESEARCH CENTERS InTrans, BEC
SPONSORS

Weyerhauser Company

Researchers
Principal Investigator
Terry Wipf

Faculty Affiliate

Principal Investigator
Wayne Klaiber

Faculty Affiliate

About the research

Longitudinal deck bridges have the potential to provide a cost effective short span alternative. In the early stages of the bridge concept development, very little data existed regarding the design of these bridge types, although some experimental laboratory testing had been performed. An analytical study was performed by Iowa State University to develop design recommendations suitable for the AASHTO Bridge Design Specifications. The analytical models, using finite element procedures, were validated using existing experimental data by others. The design recommendations focused on the load distribution of the deck panels based on common stiffener beam spacing, connectivity and geometry.

Project Details
STATUS

Completed

START DATE

05/01/85

END DATE

09/01/86

RESEARCH CENTERS InTrans, BEC
SPONSORS

Iowa State University Management
Weyerhauser Company

Researchers
Principal Investigator
Terry Wipf

Faculty Affiliate

Principal Investigator
Wayne Klaiber

Faculty Affiliate

About the research

In 1977 the Weyerhaeuser Company developed a short span glued laminated timber bridge that does not require any stringers. The bridge consists of glued laminated timber panels approximately 48 in. wide that are placed across the span in the direction of traffic. The panels are connected by stiffener beams that run in a transverse direction to the longitudinal axis of the panels and provide transverse live load distribution within the bridge. Typical maximum span lengths are 40 ft. This study focused on the structural behavior of deck panels and stiffener beams through laboratory experimental testing of a full scale bridge. In addition, finite element analytical models were developed to further study the bridge behavior. The experimental testing investigated various stiffener beam arrangements, two different connector types, various bridge widths and various truck load configurations. Deflection and strain data were collected.

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