Structures

Development length of reinforcing bars in UHPC: An experimental and analytical investigation

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Abstract

Over the last decade, Ultra High Performance Concrete (UHPC) is being used extensively in the accelerated bridge construction projects as a joint fill material between precast deck panels, box beams and decked bulb-tee girders. The current available design guidelines and connection details were arrived for such specific applications and using limited experimental research on rebar development in UHPC. These details cannot be reliably extended for different applications without more experimental testing. Also, there is no reliable design equation for estimating the development length of different sizes of rebar in UHPC. An experimental study is currently ongoing to understand the effect of rebar size, and rebar cover on the development length of rebar in UHPC. A total of 72 pull out tests and 6 beam tests with different embedment length and side cover were conducted using #4, #5, #6 and #7 bars. 3D finite element models for the test specimens using ABAQUS were developed to capture the observed behavior. The experimental results and the lessons learned from this study are presented in this paper.

Keywords: UHPC, reinforcing bar, bond strength, anchorage, development length

How to Cite:

Valentim, D. B., Aaleti, S. & Ronanki, V. S., (2016) “Development length of reinforcing bars in UHPC: An experimental and analytical investigation”, International Interactive Symposium on Ultra-High Performance Concrete 1(1). doi: https://doi.org/10.21838/uhpc.2016.85