Effects of Superstructure Creep and Shrinkage on Column Design in Posttensioned Concrete Box-Girder Bridges

Honarvar, Ebadollah; Sritharan, Sri; Rouse, Matt

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Effects of Superstructure Creep and Shrinkage on Column Design in Posttensioned Concrete Box-Girder Bridges

2017-02-01
By Honarvar, Ebadollah ; Sritharan, Sri ; Rouse, Matt

File Language:

English

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Creators:

Honarvar, Ebadollah ; Sritharan, Sri ; Rouse, Matt
Corporate Creators:

Iowa State University. Department of Civil, Construction and Environmental Engineering ; Jacobs Engineering Group Inc.
Corporate Contributors:

California. Department of Transportation ; California. Dept. of Transportation. Division of Engineering Services
Subject/TRT Terms:

Box-girder Box Girders Bridge Bridge Engineering Column Creep Dislocation (Geology) Displacement-induced Finite Element Finite Element Method Force Creep Forces Posttensioned Concrete Relaxation Relaxation (Mechanics) Shrinkage
Publication/ Report Number:

CA16-2342
Resource Type:

Tech Report
Geographical Coverage:

California;United States
Corporate Publisher:

California. Dept. of Transportation. Division of Engineering Services
Abstract:

During and after construction, cast-in-place posttensioned concrete box-girder bridges (CIP/PS Box) experience continuous movement primarily due to time-dependent shortening of the superstructure caused by creep and shrinkage. As a result, displacement-induced forces are developed in columns. These forces must be accurately estimated in order to ensure satisfactory performance of the bridge as well as to produce cost-effective design. When computer models are not used, California Department of Transportation (Caltrans) has adopted a simplified method (SM) to estimate the displacement-induced column forces, which has not been validated. This report systematically investigates the displacement-induced column forces using eight representative CIP/PS Box bridges using a combination of an experimental program and finite element analyses. It was found that Caltrans SM has deficiencies due to the estimation of strain rate and accurately accounting for concrete relaxation. Recommendations are presented to improve the Caltrans SM, thereby increasing the accuracy of calculated column design forces with due consideration to strain rate, concrete relaxation, and effects of column flexural cracking.
Format:

PDF
Funding:

65A0463
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:af26897f5e816eecfe56ae7140e1e07442067eadfdbafdbd155628533e423d5cd400277623fad0409679f73b2009159f99a229ca75ff8bfeb84afc78d351b00c
Download URL:

https://rosap.ntl.bts.gov/view/dot/37518/dot_37518_DS1.pdf
File Type:

[PDF - 10.76 MB ]

File Language:

English

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