Abstract
Ultra high-performance concrete (UHPC) application, to enhance the mechanical strength of axially loaded reinforced concrete bridge substructure elements, was proposed and investigated in an earlier study. The results recommended that depending on the UHPC shell thickness, this method may cause shifting of the critical section to undesired locations, due to over-strengthening of the repaired section, and this should be a design consideration. This paper proposes a new simplified analytical approach to calculate the bending moment capacity of the repaired circular section. This method relies on hand calculations and only requires basic material properties (compressive and tensile strengths). The results from the simplified approach are validated with a well-established numerical sectional analysis method. The proposed approach may be considered simple and more straightforward for professional engineers.
Highlights
The United States spends annually over a billion dollars on bridge maintenance and their damage control [1,2]
The damages mainly result from corrosion chloride attack on substructure elements such as columns [1,2], and the repair procedure of such elements usually involves removal of the damaged substrate and recasting the damaged zone with new material
With the advances made in the production of concrete mixes with much higher mechanical strength compared to the conventional concrete, the application of such high-performance materials for repair application is becoming more common
Summary
The United States spends annually over a billion dollars on bridge maintenance and their damage control [1,2]. A method has been proposed for repairing reinforced concrete elements using ultra high-performance concrete (UHPC) to enhance the mechanical strength of the structure [3,4,5]. The results indicated that depending on the UHPC shell thickness and due to its much higher strength compared to substrate material, the capacity of the repaired section could significantly increase and become stronger than the original designed section. Repairing the critical section (or plastic hinge location) of a column will significantly change the behavior of the structure. Since the tensile stress in UHPC is assumed to be constant (see Figure 2b), we can approximate the integral by Equation (6)
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