Authors:

Alex Ertang Kuo

Date Created:

Not specified

Course Title:

Professor:

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About Paper:

Some bridges become traffic choke points due to lane reductions. The current solution is widening the bridge by jackhammering existing concrete to expose cast-in rebar, then splicing new rebar and pouring concrete. However, this method is time-consuming and may damage the existing structure, potentially reducing the bridge's load capacity. An alternative approach is to use post-installed rebar by drilling holes near existing rebar, anchoring new rebar with mortar, and then pouring new concrete. This avoids damaging the original concrete and is more efficient. To evaluate this method's effectiveness, the lab is testing post- installed rebar specimens to validate simulation results. In parallel, the team is conducting a parametric study using finite element (FE) analysis with MASA (Macroscopic Space Analysis) as the solver. The study aims to develop an expression for the development length of post-installed rebar like the one provided in ACI 318 (2025) for cast-in rebar. Variables such as top cover, side cover, embedment depth, and bar diameter are altered one at a time in simulations to assess their influence on rebar capacity and failure mode. This systematic approach helps isolate the effects of each parameter to find the coefficients for the expression. Ultimately, creating a reliable expression for post-installed rebar development length will improve bridge extension practices by making design both faster and more efficient. Keywords: [no keywords provided]

Source:

Purdue University / 2025

Topics:

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Co-authors:

Alex Ertang Kuo