Non-Contact Splices at Drilled Shaft To Bridge Column Interface: Final Report

Masud, Mahadi; Sawab, Jamshaid; Zhou, Tianmin; Mo, Y. L.; Hsu, Thomas T. C.; University of Houston

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Non-Contact Splices at Drilled Shaft To Bridge Column Interface: Final Report

2020-04-01
By Masud, Mahadi ; Sawab, Jamshaid ; Zhou, Tianmin ; ...

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Creators:

Masud, Mahadi ; Sawab, Jamshaid ; Zhou, Tianmin ; Mo, Y. L. ; Hsu, Thomas T. C.

Masud, Mahadi ; Sawab, Jamshaid ; Zhou, Tianmin ; Mo, Y. L. ; Hsu, Thomas T. C. Less -
Corporate Creators:

University of Houston
Corporate Contributors:

Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration

Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Bridge Design Columns Cracking Finite Element Method Load And Resistance Factor Design Non-contact Lap Splice Parametric Analysis Recommendations Reinforcing Bars Splicing Stiffness Tensile Strength Validation
Publication/ Report Number:

FHWA/TX-20/0-6914-3
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Technical Report, January 2016–February 2019
Corporate Publisher:

University of Houston. Dept. of Civil and Environmental Engineering
Abstract:

This report presents an experimental and analytical investigation of non-contact lap splices at non-circular bridge column to circular drilled shaft connections. Eleven large-scale column-drilled shaft specimens were tested to investigate the effects of the critical parameters affecting the performance of non-contact lap splices. The test results showed that the specimens with larger non-contact splice distance generally exhibited lower lateral stiffness and lower capacity. The increase in the non-contact lap splice distance yielded significant inclined cracks and splitting cracks in the non-contact lap splice zone. The angle of inclined cracks increased with increasing the non-contact splice distance. Also, a significant opening at the column-drilled shaft interface and the opening increased along with the non-contact splice distance. Due to this large opening at the column-drilled shaft interface, the dowel bars and the column longitudinal bars could be subjected to corrosion over time. The test results showed that non-contact lap splices constructed with splice lengths equaling standard lap splice length (as per the current AASHTO LRFD code) plus the non-contact lap splice distance were effective in developing yielding and strain hardening of the spliced bars provided that the transverse reinforcements were designed according to the guidelines recommended in this report. The transverse reinforcement in the column and the drilled shaft in the vicinity of the column-drilled shaft interface exhibited the highest tensile stress within the non-contact lap splice zone. The tensile stresses in the transverse reinforcement further from the interface were significantly lower than those near the column-drilled shaft interface. Further, a three-dimensional finite element analysis (FEA) was performed on the test specimens and the finite element simulated results were compared with the test outcomes. Using the validated FEA models, a thorough parametric analysis, performed to understand the effect of the critical parameters, showed that the larger the lap splice distance, the greater the contribution of longer lap splice length in increasing lateral stiffness of the specimens designed with non-contact lap splices. The study results provide a basic understanding of the design of non-contact lap splices in non-circular columns to circular drilled shaft connections. Based on the findings from the analytical and experimental investigation, a set of design recommendations is provided for the design of non-contact lap splices in geometrically dissimilar bridge column-drilled shaft connections. All in all, with the consideration of the current AASHTO LRFD code and the proposed guidelines of this study, a safe and efficient non-circular column to circular drilled shaft connection can be constructed.
Format:

PDF
Funding:

0-6914
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:e156f8dbca6d18c5f75fba2b3bc1967c62ea870a8c161336f62c4338f451cf6f
Download URL:

https://rosap.ntl.bts.gov/view/dot/55556/dot_55556_DS1.pdf
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Non-Contact Splices at Drilled Shaft To Bridge Column Interface: Final Report

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