Calibration of Load and Resistance Factors in LRFD Foundation Design Specifications

Wang, Zuocai; Chen, Genda; Kwon, Oh-Sung; Orton, Sarah; University Transportation Centers Program (U.S.)

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Calibration of Load and Resistance Factors in LRFD Foundation Design Specifications

2011-02-01
By Wang, Zuocai ; Chen, Genda ; Kwon, Oh-Sung ; ...

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English

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Details:

Creators:

Wang, Zuocai ; Chen, Genda ; Kwon, Oh-Sung ; Orton, Sarah

Wang, Zuocai ; Chen, Genda ; Kwon, Oh-Sung ; Orton, Sarah Less -
Corporate Creators:

University Transportation Centers Program (U.S.)
Subject/TRT Terms:

[+]

Bridge Design Bridge Foundations Bridge Superstructures Concrete Diaphragm Girder Bridge Load Factor Prestressed Concrete Bridge Probabilistic Distribution Random Variable Reliability Index Resistance (Mechanics) Solidslab Bridge Specifications Tables (Data) Tolerable Settlement
Publication/ Report Number:

NUTC R237 ; 00022979

NUTC R237 ; 00022979 Less -
Resource Type:

Tech Report
Geographical Coverage:

Missouri
OCLC Number:

704404398
Edition:

Final
Corporate Publisher:

Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
NTL Classification:

NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;
Abstract:

This report summarizes the findings and recommendations on the impact of foundation settlements on the reliability of bridge superstructures. As a collaborative effort of an overall initiative for the development of LRFD foundation design specifications, this study is focused on the investigation of pros and cons for including foundation settlements in bridge designs under gravity loads. Settlement was modeled both probabilistically and deterministically. In the case of a random settlement variable, a lognormal distribution was used in reliability analysis with a fixed coefficient of variation of 0.25. Dead and live loads were modeled as random variables with normal and Gumbel Type I distributions, respectively. Considering the regional traffic condition on Missouri roadways, the effect of a live load reduction factor on bridge reliability was also investigated. Therefore, a total of eight cases were discussed with a complete combination of settlement modeling (mean and extreme values), design consideration (settlements included and excluded), and live load reduction (unreduced and reduced live loads). Based on extensive simulations on multi-span bridges, bridges designed without due consideration on settlements can tolerate an extreme settlement of L/3500 - L/450 under unreduced live loads and up to L/3500 under reduced live loads without resulting in a reliability index below 3.5 (L=span length). Depending upon span lengths settlements and has potential to reduce overall costs in bridge design. The second method may result in oversized foundations.
Format:

PDF
Funding:

DTRT06-G-0014
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:6d7092013124c29f8fc655239ca2a4cca4aafd047460af9cd93d59ec21593ac8
Download URL:

https://rosap.ntl.bts.gov/view/dot/18629/dot_18629_DS1.pdf
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Calibration of Load and Resistance Factors in LRFD Foundation Design Specifications

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