Abstract
Ultra-high-performance Concrete (UHPC) has a wide range of potential civil engineering applications, owing to its excellent mechanical properties and durability. To investigate the bending behavior of reinforced UHPC components, nine reinforced UHPC deck specimens were tested by conducting four-point bending experiments. The crack development, load-carrying capacity, and strain distribution were observed, and the tests results revealed that the introduction of steel fibers into UHPC obviously improved the structure’s toughness and crack resistance. Based on the tests results, a theoretical formula was derived for calculating the bending stiffness of the UHPC decks during the entire loading process, which was divided into three representative stages based on the initial cracking and yielding. The results for the load-deflection response obtained by the formulas are in good agreement with the experimental results.
Highlights
Steel-concrete composite beams are the most widely used beams in bridge engineering projects (Nie et al, 2019)
In order to reduce the expense of ultra-high-performance concrete (UHPC), the coarse aggregates are introduced in UHPC, which can reduce the impact of the shrinkage strain to a certain degree
The introduction of the steel fibers brings outstanding tensile strength and the characteristics of strain hardening for UHPC, called UHPFRC (Ultra-High Performance Fiber Reinforced Concrete), which is inaccordance with the ordinary concrete
Summary
Steel-concrete composite beams are the most widely used beams in bridge engineering projects (Nie et al, 2019). Remarkable progress has been made in the development of ultra-high-performance concrete (UHPC) Its mechanical properties, such as the compressive and tensile strength, and elastic modulus, have been significantly enhanced while the cost has substantially reduced (Wang et al, 2018). The introduction of the steel fibers brings outstanding tensile strength and the characteristics of strain hardening for UHPC, called UHPFRC (Ultra-High Performance Fiber Reinforced Concrete), which is inaccordance with the ordinary concrete. Based on the above consideration, in order to develop the theoretical method for calculating the bending capacity of reinforced UHPC, which considers the contribution of the tensile strength of UHPC, three sets of reinforced UHPC with coarse aggregates deck specimens with different reinforced ratios were designed and tested. The crack development, load-bearing capacity, failure mode, and strain distribution of the concrete and steel rebar were measured. The elastic modulus of the steel rebar was equivalent to 1.8% of the initial value
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